STEM-Talk

Our guest today is Dr. Josh Turknett, the author of “The Migraine Miracle” and “Keto for Migraine,” two books that have helped thousands of people use a holistic approach to end their chronic migraines. Josh is often referred to as “public enemy number one to migraines” everywhere. He is a neurologist, musician, author, and entrepreneur. He has more than two decades of experience in the field of cognitive and behavioral neuroscience. Josh practices medicine in Atlanta at the Turknett Center for Neurology and Cognitive Enhancement. In today’s episode, we talk to Josh about his own history with migraines and how migraine is a common and complex neurological disorder that includes a genetic component. Josh earned a bachelor’s degree in cognitive neuroscience from Wesleyan University, an M.D. from Emory University, and completed his residency training at the University of Florida. In addition to his medical practice, Josh also is the founder of Brainjo, a company that creates educational resources that utilize a system of instruction based on the science of learning and neuroplasticity. He’s a musician who plays in the band The Georgia Jays and teaches people to play the clawhammer banjo, fingerstyle banjo, fiddle and ukulele. As if he didn’t have enough to do, Josh also is the president of Physicians for Ancestral Health and the chief medical officer for humanOS, which was recently acquired by Restore Hyper Wellness. Josh also is the host of the Intelligence Unshackled podcast, which explores the many ways that human potential is constrained and how people can go about optimizing it. Show notes: [00:03:22] Dawn opens the interview asking Josh about his mother’s struggles with migraines. [00:04:59] Dawn asks Josh how old he was when he first started having migraines. [00:06:15] Ken asks Josh how he first became interested in science. [00:08:24] Dawn asks Josh how he ended up in the Connecticut at Wesleyan University for his undergraduate degree. [00:09:35] Ken asks if Josh knew he wanted to major in neuroscience when he first arrived at Wesleyan or if that was a later decision. [00:10:49] Dawn asks if it is true that Josh’s girlfriend at the time played a role in his decision to move back to Atlanta to go to medical school at Emory after his undergrad. [00:11:55] Dawn asks what motivated Josh to attend the University of Florida for his residency after being a lifelong Gator-hater. [00:14:39] Ken mentions that despite all the hype around neuroscience when the field was emerging, the last major breakthrough in neurology was in the ‘90s with the discovery of triptan drugs for migraines. Ken asks if we have made any major neurological advances since then, and if not, why? [00:17:41] Ken asks Josh what he would suggest to today’s neurology residents and neuroscience graduate students who might want to avoid the recent failures of the modern approaches to treating neurological disease. [00:19:57] Dawn explains that a migraine is a complex neurological disorder affecting 15 to 20 percent of the population, with many subtypes including a genetic component. Dawn asks Josh what is currently understood about the genetic component of migraines. [00:21:28] Ken asks Josh at what point in his career did he decide to specialize in migraines. [00:23:17] Dawn asks Josh to explain to people who have not suffered from migraines what it feels like to experience a cascade of symptoms such as numbness, tingling, visual disturbances, nausea, vomiting, dizziness, fatigue, and blinding headaches. [00:25:15] Ken asks Josh what the difference is between cluster headaches and migraines. [00:26:49] Dawn mentions that people can start to feel the onset of a migraine 48 hours before the pain sets in, a phase called the prodrome. Josh explains what the prodrome is and what its symptoms are. [00:28:03] Dawn mentions the fact that the pain of a migraine is preceded by an aura, which is often a frightening but temporary neurological disturbance that sets off an alarm of an impending migraine headache. She asks Josh what is known about auras. [00:30:11] Ken asks if the auras experienced by migraine sufferers is similar to the experiences some people have preceding an epileptic seizure. [00:30:41] Ken asks if people bounce back immediately once the migraine is over, or if there is a recovery period involved. [00:31:53] Dawn switches to the topic of how diet and lifestyle can help people manage their migraines by asking Josh about how his interest in ancestral health, and the ancestral way of eating. [00:34:43] Ken asks Josh what discoveries led him to write his 2013 book, “The Migraine Miracle.” [00:38:12] Dawn mentions that the ketogenic diet has become extremely popular over the past few years. Dawn goes on to say that while the ketogenic diet has been largely understood to help people with weight loss, epileptic seizures, metabolic disorders, and many other health issues. Dawn asks Josh to talk about how when his book “Keto for Migraine” came out, there weren’t many references to how a low-carb/high-fat diet could help people with their migraines. [00:42:16] Dawn mentions that in “Keto for Migraine” Josh points out that the typical version of the ketogenic diet can make migraines worse. Given that, Dawn asks what the keys are for maximizing the benefits of keto for the migraine brain. [00:43:12] Dawn asks Josh to address how ketosis impacts blood cholesterol testing. [00:45:46] Ken asks what other things Josh has learned about ketosis and the migraine brain. [00:48:42] Ken mentions fasting as a way to induce ketosis, and asks if Josh utilizes fasting, either for himself or as a recommendation for his patients. [00:51:43] Although fasting has become a popular fad in recent years, the journalist Upton Sinclair wrote a best-selling book back in 1911 called “The Fasting Cure.” Dawn asks Josh about the interesting things he learned from reading Sinclair’s book. [00:53:34] Ken asks if Josh has investigated the possibility of a connection between migraines and gut health, given the multitude of disorders now being associated with a breakdown in the gut. [00:56:25] Dawn mentions that in addition to Josh’s medical practice, he is a musician, playing banjo for the Georgia Jays. He also is an entrepreneur, a business consultant, and is currently the president of the Physicians for Ancestral Health, a role previously held by Tommy Wood. Dawn asks how Josh can manage this wide variety of roles and interests. [00:58:49] Dawn asks how long Josh has been playing banjo. Josh also talks about the band he plays with, the Georgia Jays. [01:00:08] Dawn mentions Josh’s book “The Laws of Brainjo,” a compilation of articles about the fundamental principles of learning, described by Josh as a neuroscience-based system of instruction for learning as well as an owner’s manual for molding a musical mind at any age. Josh gives a brief overview of his Brainjo system. [01:03:33] Ken mentions Josh’s recent IHMC lecture about how the significant reduction in cognitively demanding activities that occurs over a typical human lifespan may be a driving force in the development of cognitive decline and dementia, a phenomenon described as the Demand Driven Decline Theory. Ken asks Josh to touch on the Demand Driven Decline Theory and on some of the key points from his lecture. [01:08:04] Dawn mentions that a previous STEM-Talk guest, Dr. Dale Bredesen has proposed a multi-modal model that includes toxic exposures, stressors, diet, genetics, and hormonal effects as drivers of cognitive decline that need to be individually assessed and addressed based on the patient. Dawn goes on to explain that in this model, the capacity of the brain slowly decreases over time as injury accumulates, until supply of cognitive function no longer meets demand. This model contrasts Josh’s Demand Driven Decline Theory and given that there is evidence to support both theories, Dawn asks Josh how they might be reconciled. [01:11:15] Ken asks Josh to reiterate the importance of adults doing things they are not good at, and if Josh has any thoughts on how we can encourage and support people to continue to learn new skills. [01:15:09] Dawn mentions that in 2018, Josh launched the Intelligence Unshackled podcast, which explores the potential of human intelligence. Dawn goes on to mention that on the show’s home page, Josh points out that the human brain has far more potential than most people realize and that releasing that potential requires people to understand and address the ways in which their brains are limited or shackled. Josh talks about what led him to enter the podcast world and gives an overview of his show. [[01:18:01] Dawn mentions that Josh plays tennis in his spare time, asking if this is something he has always done, or an interest taken up later in life. [01:19:24] Ken asks if it is true that another part of Josh’s daily routine is a walk with his wife. [01:20:19] Ken closes the interview mentioning that a little birdie, perhaps a Georgia Jay, told him that Josh and his family have a special musical tradition at Christmas. Links: Josh Turknett website Josh Turknett Amazon page Georgia Jays Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio    

Our guest today is Dr. Morley Stone, the former Chief Technology Officer for the Air Force Research Laboratory (AFRL) and former Senior Vice President for Research at Ohio State University, who is now IHMC’s Chief Strategic Partnership Officer. Morley is recognized as an international leader in biomimetics and human performance. In today’s interview, we talk to Morley about his time as AFRL’s chief technology officer as well as his stint as the chief scientist for the Air Force’s 711th Human Performance Wing, which is responsible for providing technical oversight of projects geared to optimize human performance for the nation’s air, space, and cyberspace forces. We also have a fascinating conversation with Morley about his early career and research into biomimetics, which is the study of using biological structures, materials and principles as models for the development of new materials, structures, and devices. In his new role at IHMC, Morley will become the institute’s point person for public- and private-sector partnerships. He also will work with IHMC’s scientists and research staff to help coordinate and implement the multitude of scientific projects the institute has in its pipeline. Show notes: [00:03:07] Dawn mentions that Morley grew up in a small steel producing town in Pennsylvania and asks him what he was like as a kid. [00:03:56] Ken asks Morley about his days as wrestler growing up and why he still today views wrestling as a special sport. [00:05:00] Dawn asks about Morley’s move to Dayton, Ohio, when he was 17. [00:05:36] Dawn asks how Morley decided upon Wright State as opposed to the University of Dayton. [00:05:57] Morley tells the story of how a girl in college pointed out an ad for an internship and how that helped him decide to become a biochemistry major. [00:06:43] Dawn asks what happened to the girl who pointed out the aforementioned ad. [00:08:28] Ken asks Morley to talk about the Air Force Research Lab (AFRL) and the role of the lab’s Materials and Manufacturing Directorate. [00:09:53] Dawn mentions that after earning his bachelor’s degree, Morley had a short stint as a materials research engineer at the directorate before heading off to Carnegie Mellon University to work on a Ph.D. in biochemistry. Dawn asks why Morley chose to attend Carnegie Mellon. [00:11:08] Dawn mentions that in the late ‘80s and early ‘90s, Morley had the good fortune to work with scientists who had the foresight to know that there was going to be a radical change in material science, which up until that point had been dominated by metals and ceramics. Morley talks about the most important lessons he learned from these colleagues and mentors. [00:12:41] Dawn asks about Morley’s time as a research biologist, and eventually principal research biologist, at the Materials and Manufacturing Directorate after his Ph.D. [00:14:41] Ken asks Morley to explain biomimetics and discuss the systems that Morley and his colleagues looked at during his time at the Materials and Manufacturing Directorate, ranging from infrared sensing to instances of biological camouflage. [00:18:01] Dawn mentions that the creation of nanoscale materials for advanced structures has led to a growing interest in the area of biomineralization, she goes on to say that during Morley’s time at the directorate, he especially researched the process of biomineralization and the assembly of nanostructured inorganic components into hierarchical structures, which led to the development of a variety of approaches that mimic the recognition and nucleation capabilities found in biomolecules for inorganic material synthesis. Morley discusses his 2002 paper in Nature Materials where he described the in vitro biosynthesis of silver nanoparticles using silver-binding peptides. [00:21:20] Dawn asks about Morley’s 2004 paper in Advanced Materials where he and his colleagues had taken a protein that was responsible for thermal sensing and incorporated it into an array. [00:23:21] Ken asks about the follow-up paper to Morley’s aforementioned 2004 paper, published in 2005 in the Journal of the American Chemical Society. It was titled “Polypeptide-Templated Synthesis of Hexagonal Silica Platelets.” [00:25:28] Dawn asks Morley about his time as program manager in DARPA’s Defense Science Office from 2003 to 2006. [00:27:30] Morley explains what the Heilmeier Catechism is. [00:28:51] Dawn asks about Morley’s time as senior scientist for Molecular Systems Biotechnology in the Human Effectiveness Directorate of the Air Force Research Laboratory. [00:31:25] Ken mentions that in a 2011 report that ran in The Armed Forces Journal, Morley laid a foundation for how the Department of Defense could play a leadership role in human performance augmentation as a way of developing the “quantified warrior” as he described it. Ken goes on to mention that he cited this paper in a 2014 article he co-authored with Clark Glymour for the Bulletin of Atomic Scientists titled “The Enhanced Warfighter.” Ken asks Morley to talk about his paper and the changes that he has seen in the field since it was published. [00:35:31] Dawn asks what led Morley in 2018 to become the senior vice president for research at Ohio State University. [00:36:33] During a meeting recently held at IHMC, a young academic asked Morley why he left the lab and working directly in applied research to pursue more of a leadership role. Morley responded by saying, “I’m going to be very clear that there’s nothing as fun as when you’re a bench scientist.” Dawn asks Morley why he thinks this. [00:40:00] Ken asks Morley what it is about the various leadership roles that he has had over the years that he finds most rewarding. [00:42:36] Dawn asks why Morley recently joined IHMC and how he sees his new position as the institute’s Chief Strategic Partnership Officer. [00:44:26] Ken mentions that during Morley’s time at DARPA he focused on biologically inspired robotics. Now that Morley is working at IHMC, Ken asks how it feels to be working with a robotics lab that also draws its inspiration from biology. [00:45:40] Ken asks Morley what he likes to do with his spare time now that he and his wife have settled into Pensacola. Links: Morley Stone bio Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio    

In today’s episode, Dr. Tommy Wood returns for his fifth appearance on STEM-Talk. Tommy is a UK-trained physician and an assistant research professor of pediatrics at the University of Washington. He also is a visiting research scientist and a valued colleague of ours here at IHMC. Today’s interview focuses on a new paper that Tommy just had published by the American Society for Microbiology. It’s titled, “Reframing Nutritional Microbiota Studies To Reflect an Inherent Metabolic Flexibility of the Human Gut: A Narrative Review Focusing on High-Fat Diets.” We discuss the paper and follow up on some research Tommy has done since his last appearance on STEM-Talk, a two-part interview that took place a little more than a year ago. In that two-part interview, episodes 110 and 111, we touched on Tommy’s research into the importance of metabolic health and how only one in eight Americans is considered metabolically healthy. We also talk to Tommy about a new grant he just received to examine the effects of azithromycin on premature brain injury in a ferret model. As part of this grant, Tommy will be collaborating with his wife, Dr. Elizabeth Nance, who also is an assistant professor at the University of Washington and was our guest on episode 71 of STEM-Talk. Show notes: [00:03:15] Dawn opens the interview mentioning Tommy’s new paper published by the American Society for Microbiology titled “Reframing Nutritional Microbiota Studies to Reflect an Inherent Metabolic Flexibility of the Human Gut: A Narrative Review Focusing on High-Fat Diets.” Dawn mentions that in our last interview with Tommy, he talked about the importance of insulin sensitivity and metabolic health, yet as Tommy has pointed out, more than 80 percent of Americans have some kind of metabolic disease or dysfunction. Given that, Dawn asks Tommy to revisit key points regarding insulin resistance; the importance of metabolic health; and why so many Americans struggle with this issue. [00:06:18] Ken points out that the common view held in much of the nutritional-microbiota research is that high-fat diets are harmful to human health, at least in part through their modulation of the gut microbiota. Ken goes on to say that there are a number of studies that support the inherent flexibility of the human gut and our microbiota’s ability to adapt to a variety of food sources, suggesting a more nuanced picture than the commonly held view. Ken asks Tommy to give an overview of the gut microbiome and how research in the past decade has explored the effects of the gut microbiome on our metabolism, immune systems, our sleep, and our moods and cognition. [00:09:50] Dawn asks Tommy to explain the history of how fat, and high-fat diets, became public enemy number one in many circles, including gut microbiome research. [00:12:46] Ken mentions that there are many limitations when it comes to preclinical nutritional research, with many studies on the role of fat in the diet being based on animal models, particularly rat models, which presents several problems since the natural diet of a mouse is low in fat and high in carbohydrates. [00:15:50] Ken asks Tommy about the need for a more nuanced view of fat and our microbiota’s ability to adapt to different food sources. [00:17:33] Ken points out that while people might throw around the term “healthy gut microbiota,” the research into the gut microbiota is so new that we don’t yet know for sure what a healthy gut microbiota should look like. [00:21:22] Ken asks Tommy how we should go about reframing the debate about fat and high-fat diets to better reflect the overall evidence. [00:23:48] Dawn mentions that in the past decade, researchers have significantly improved our understanding of the gut microbiome. She asks about Tommy’s belief that there is a need to understand the gut microbiome in an evolutionary context as well. [00:25:18] Tommy gives an overview of the gut-barrier function and its role in health and disease. [00:25:31] Dawn asks Tommy to talk about the significance of the study by Duke University’s David Lawrence that Tommy cited in his aforementioned paper, which highlights how quickly and reliably the human gut microbiota adapts to dietary changes. [00:30:42] Dawn mentions that there is a lot of research supporting the therapeutic effects of a ketogenic diet on overall health in the context of epilepsy and multiple sclerosis. She asks if there is any such research that focuses on the gut. [00:34:01] Dawn asks about the assertion in Tommy’s aforementioned paper that while butyrate production may be reduced on a ketogenic diet, other molecules can potentially take butyrate’s place to maintain the gut barrier function, an assertion that challenges many assumptions about normal metabolic pathways in the gut. [00:36:21] Ken asks if there have been any studies that Tommy knows of that have assessed the effects of ketones, or a ketogenic diet, on the gut barrier function. [00:39:50] Dawn asks about the mouse models and preclinical studies that show that ketogenic diets or ketones are cancer suppressive. [00:40:52] Ken mentions that Tommy addresses three objections concerning the effects of fat and protein on our gut microbiota in his paper, asking Tommy to briefly go over these objections and his responses to them. [00:45:42] Dawn asks Tommy what he believes are the questions that need to be asked or answered when it comes to nutritional microbiota research. [00:46:36] Dawn mentions Tommy’s 2020 IHMC evening lecture about nourishing the human brain titled “Brain Health Across the Lifespan.” Dawn asks about the grant Tommy just received to examine the effects of azithromycin on premature brain injury in a ferret model. [00:48:35] Dawn asks Tommy what it is about azithromycin that he finds particularly exciting as a potential neuroprotective agent. [00:50:52] Ken mentions that Tommy will be collaborating on the grant with his wife, Dr. Elizabeth Nance, a faculty member of the University of Washington who was our guest on episode 71 of STEM-Talk. Ken asks Tommy how he and his wife’s work on this project will intersect. [00:53:42] Dawn asks Tommy how Elizabeth is doing. [00:54:26] Ken asks how Tommy’s findings on neuroprotection in babies might be transferable to adults looking to optimize their neural health. [00:59:02] Dawn closes the interview asking Tommy about his dogs and his most important goal in life. Links: Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio Tommy Wood bio Tommy Wood talk on brain health  

It’s time for another Ask Me Anything episode. In today’s show, Ken and Dawn tackle a wide range of listener questions about: — Protein intake on a ketogenic diet. — A new study on the efficacy and safety of MDMA-assisted therapy. — The Pentagon’s new report about UFOs. — Virta Health’s two-year pilot study that demonstrated people diagnosed with prediabetes had normalized their glucose through carbohydrate restriction. — The FDA’s controversial approval of the Biogen Alzheimer’s disease drug Aduhelm. — The deepest man-made pool and diving research facility that just opened in Dubai. — Strategies to deal with the so-called “keto flu.” — And a lot more. Enjoy. 00:02:49 A listener asks Ken about protein intake on a ketogenic diet. The listener says they have heard some experts say that protein intake should be fairly low on a ketogenic diet while other experts suggest protein needs might actually be higher than what is generally recommended. The listener, who is physically active and on a ketogenic diet but isn’t seeing much muscle growth, asks Ken what the research says about what proper levels of protein on a ketogenic diet. 00:05:05 A listener asks Ken about STEM-Talk’s interview with Gordon Lithgow, episode 120 of STEM-Talk, mentioning that Ken and Gordon referenced arginine AKG, a supplement often used by athletes and bodybuilders to improve their performance and reduce muscle fatigue. The listener asks if arginine AKG, or calcium AKG, or something else can help them recover from exercise as they get older. In his response, Ken discusses a 2017 meta-analysis by Robert Wolfe. Ken also mentions two essential amino acid blends, MAP Master Amino Acid Pattern. The other blend is called Mass Pro Synthagen. 00:12:09 A listener mentions in their question that there is a new study that just came out in Nature Medicine looking at the efficacy and safety of MDMA-assisted therapy for people diagnosed with severe PTSD. Nearly 70 percent of the participants who received MDMA therapy no longer qualified for a diagnosis of PTSD after two months of treatment. The listener asks Ken and Dawn if they have read this study and what their thoughts are. Ken in his response mentions two STEM-Talk episodes that touched on MDMA-assisted therapy, David Rabin in Episode 99 and Rachel Yehuda in episode 101. 00:14:37]A listener asks Ken what the justification for spending almost $3 billion on the Perseverance Mars mission is, going on to ask with all the needs here on Earth, how does NASA and Congress justify the billions that will be needed for a manned mission to Mars. 00:19:06 A listener asks how Dawn’s research on glymphatic function in extreme environments is going. 00:22:31 A listener asks Kens for his thoughts on the recent media coverage of the Pentagon’s new report on more 100 UFOs, or “unidentified aerial phenomena,” that the Pentagon cannot explain. 00:25:49 A listener mentions that Virta Health is wrapping up its data collection of a five-year trial that looks at nutritional ketosis as a treatment for type-2 diabetes and prediabetes. Virta recently published the results of its two-year pilot study that demonstrated people diagnosed with prediabetes had normalized their glucose in the blood through carbohydrate restriction. The listener asks Ken to comment on this two-year pilot study since Ken is affiliated with Virta. In his response, Ken mentions Amy McKenzie’s 2021 paper. 00:27:17 A listener asks Ken about the controversial FDA approval of the Biogen Alzheimer’s disease drug Aduhelm. Despite murky clinical trial results, the drug was fast-tracked, even though it will cost a person $56,000 annually. 00:30:57 A listener asks Dawn, given her diving background, about the deepest man-made pool and diving research facility that just opened in Dubai. 00:33:44 A listener asks Ken about a study that ran in JAMA that found that fasting for 12 hours or more led to minimal weight loss and significant muscle loss. The listener mentions that these results go against the research of some previous STEM-Talk guests like Satchin Panda, and asks Ken to weigh in on these results and the design of the study. In his response, Ken refers to several well-done studies and a 2019 paper by Tinsley, titled, “Time Rest Restricted Feeding Plus Resistance Training In Active Females, a Randomized Trial.” 00:37:21 A listener asks Ken about the new center for human performance that IHMC is looking to build in Pensacola. 00:38:07 A listener mentions a study that ran in PLOS Medicine which reported that men and women whose workout routines consistently included resistance exercise were less likely to become obese. The listener asks if, based on this, whether what we do in terms of exercise, particularly resistance training, is just as important as the foods we eat and the diets we follow. 00:40:28 A listener mentions Dawn’s research in neuroprotection in stressful environments and asks if Dawn is also looking at applying these findings to clinical scenarios, such as surgery, anesthesia, and radiation. 00:42:00 A listener asks Ken about how to deal with the “keto flu” mentioning that he remembers being given salt tablets by his coach when he was younger, but is unable to find them now. In his response, Ken mentions Robb Wolf’s LMNT electrolyte product and an article on Virta Health’s website that addresses electrolytes and the importance of managing potassium and sodium as part of a well-formulated ketogenic diet. Links: Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio

Our guest today is Dr. Christoffer Clemmensen, an associate professor and lead researcher at the University of Copenhagen’s Novo Nordisk Foundation Center for Basic Metabolic Research. Christoffer’s lab at the university explores pharmacological and therapeutic treatments for obesity and its related diseases and disorders. He and his colleagues focus on dissecting the neuroendocrine signals involved in coordinating appetite, food-motivated behavior, energy expenditure, glycemic control, and lipid metabolism. We have a fascinating discussion with Christoffer about his lab’s efforts to turn molecular and physiological insights into innovative therapeutic strategies that Christoffer hopes someday can reduce obesity and its associated metabolic disorders. Christoffer is a native of Denmark who earned his Ph.D. in Molecular Pharmacology from the University of Copenhagen in 2013. Joining Ken for today’s interview is IHMC colleague and senior research scientist Dr. Marcas Bamman, who was our guest on episode 116. Marcas is the founder and former director of the University of Alabama at Birmingham Center for Exercise Medicine.  Marcas joined IHMC last year as a Senior Research Scientist. Show notes: [00:03:24] Marcas asks Christoffer about growing up in a small rural town in Denmark in the 1980s and ‘90s. [00:04:05] Christoffer’s talks about his days as an elite tennis player when he was a youth. [00:04:41] Ken asks Christoffer when he first became interested in science. [00:05:48] Marcas asks Christoffer what changed his mind about wanting to study computer science at university. [00:07:04] Christoffer explains how he decided to attend University of Copenhagen. [00:08:19] Marcas mentions that Christoffer’s original focus at university was on exercise biology, but that he became fascinated by the mechanisms of obesity and that interest took him in a new direction. Marcas asks how that shift in interest came about. [00:10:01] Marcas follows up on the previous question and asks if there were a particular instance that persuaded Christoffer to switch from focusing on exercise to focusing more on weight control and obesity. [00:10:40] Ken asks what led Christopher to pursue a Ph.D. in molecular pharmacology after attaining a bachelor’s degree in exercise biology and a master’s degree in human biology. [00:12:11] Marcas asks Christoffer why he went to Munich, Germany, as a postdoctoral fellow at the Helmholtz Diabetes Center after completing his post-doc at the University of Copenhagen. [00:14:00] After mentioning that Christoffer eventually became the group leader at Helmholtz, Ken asks Christoffer why he then transitioned back to the University of Copenhagen. [00:14:52] Marcas asks Christopher to talk about the big questions that get to the heart of his research. [00:16:20] Ken mentions that Christoffer is now an associate professor at the Nova Nordisk Foundation Center for Basic Metabolic Research at the University of Copenhagen, where he is the head of the Clemmensen Group. Ken goes on to mention that the Clemmensen Group’s website says the lab focuses on dissecting the neuroendocrine signals that coordinate appetite regulation, food-motivated behavior, energy expenditure, glycemic control, and lipid metabolism. Ken asks if Christoffer could give an overview of what all these research focuses entail. [00:18:17] Marcas mentions that obesity and its related diseases, such as type-2 diabetes and cardiovascular disease, have become serious problems affecting the world’s public health and global economy. Marcas goes on to say that Christoffer’s 2019 paper titled “Emerging hormonal-based combination pharmacotherapies for the treatment of metabolic diseases” makes the observation that the treatments we have been using to deal with this problem have not been able to effectively reverse the staggering rates of obesity we’re witnessing around the world. Marcas asks Christoffer to talk about this paper and how it underscored the need for better treatments of obesity. [00:19:48] In light of the need to target multiple signaling pathways to effectively treat obesity that Christoffer described in his 2019 paper, Ken asks Christoffer to explain the hormonal-based pharmacotherapies that he has been looking into as potential treatments for obesity. [00:21:58] Marcas asks Christoffer why an overwhelming majority of people who do manage to lose weight end up gaining the weight back, and what are the most effective therapies to help keep the pounds off once a person does lose weight. [00:23:56] Marcas mentions that Christoffer followed his 2019 paper with a review in PLOS Biology that looked at the evolutionary and environmental perspectives on human body weight. The paper asks the question, “Why are we not all obese?” Marcas, considering that poignant question, asks Christoffer why everyone isn’t prone to gaining weight in the same way. [00:26:44] Ken mentions that he has heavy doubts that our species experienced a recent biological change that would have caused a massive increase in obesity within the last 30-80 years, given that only a few decades ago most people were slender. [00:27:52] Marcas asks about the elusive slimming gene, mentioning that biologists have identified the physiological agents that keep our fat mass from becoming too low, but have had trouble understanding the exact mechanisms that regulate excess fat. He asks Christoffer to expound upon the current research as well as evidence dating back to the 1950s for the existence of a blood-borne, weight-gain preventive molecule. [00:30:09] Ken asks Christoffer about other factors that regulate energy balance in the body. [00:32:10] In light of the fact that a chronic state of positive energy balance leads to weight gain, Ken asks Christoffer what he believes is the key pathway to target, whether it be appetite control, energy expenditure, or a combination of both. [00:34:14] Marcas asks Christoffer to explain the remarkable differences between brown fat and white fat, and in this context to summarize his 2018 paper in nature communicationsthat described the potent effects of stimulating brown fat thermogenesis with a drug called icilin. [00:37:14] Marcas mentions that Christoffer’s paper in PLOS Biology addressed how geneticists are starting to uncover potential weight-gain defense genes. The paper, however, argues that for humans to fully benefit from such research, physiologists will have to play a role in the interpretation of such genetic discoveries. Marcas asks Christoffer what kind of collaboration he thinks is necessary between physiologists and geneticists. [00:39:08] Ken asks if the fact that the human genome has stayed stable throughout the rise in obesity over the past several decades suggests that epigenetic modifications play a role, and if Christoffer thinks that differences in obesity susceptibility across individuals might be partially explained by differences in the epigenome. [00:41:28] Marcas asks what the current status of pharmacological obesity treatment is and if Christoffer anticipates that landscape changing in the near future. [00:43:43] In terms of translating promising results in rodents to humans, Ken asks Christoffer to describe the specific challenges we face in using rodents to understand obesity in humans. [00:47:18] Ken mentions the overreliance on weight and BMI as measurements as opposed to body composition, which depreciates the value of muscle as an energy storing organ. [00:49:03] Marcas mentions that the model for pharmacological treatment of obesity seems to be leaning towards suppression of appetite. Marcas asks if such an agent were to be found, how successful does Christoffer think it would be in the long term if the pharmacotherapy was given in the absence of a behavioral change. [00:51:16] Marcas asks Christoffer to elaborate on his belief in the importance of omic-methods as well as how he is using such methods in his own research. [00:53:17] Ken asks about the greatest benefits, as well as the challenges, of using an untargeted approach to metabolomics profiling, which Christoffer wrote about in his 2020 article addressing molecular changes in the body following bouts of endurance and resistance exercise. [00:56:05] Ken asks how Christoffer decided which metabolites to study more closely in the aforementioned study. [00:57:14] Marcas mentions that Christoffer’s aforementioned 2020 study focused on physiological changes that took place within a few hours of exercise. Marcas goes on to mention that efforts are underway to better understand such acute molecular changes in the context of longer-term training, as the acute responses to exercise in a sedentary human are likely to be much different than the acute response of a trained individual. Marcas asks how we can learn from the range of responses in trained vs. untrained states as it pertains to weight management mechanisms or other health benefits. [00:59:08] Marcas brings up Christoffer’s most recent paper published earlier this year in Nature Communication, in which Christoffer asks the question: How does the exercise-and-appetite-related protein GDF15 act in different contexts? Marcas goes on to mention that the paper found that GDF15 acts differently based on whether it is endogenously produced or pharmacologically applied and asks Christoffer to talk about this in more depth. [01:04:00] Marcas explains that exercise-response molecules, of which there are a number, are dose dependent, which is to say that they are produced more, or stay in the body longer, depending on the mode and or intensity of the exercise. He goes on to ask if GDF15 has any dose dependency associated with it in respect to the magnitude of elevation and time it stays elevated. [01:06:30] Marcas congratulates Christoffer on his research gaining more attention and his lab growing to about a dozen people. [01:07:57] Marcas asks Christoffer what he does to stay in shape and if he still plays tennis. [01:08:52] Ken closes the interview asking if this is Christoffer’s first podcast interview in English and if Christoffer enjoys listening to podcasts. Links: Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio

Today we have the second part of our interview with science and health journalist Gary Taubes. In the first part of our interview, episode 124, we talked to Gary about his new book “The Case For Keto: Rethinking Weight Control and the Science and Practice of Low-Carb/High-Fat Eating.” In today’s episode, we talk in detail about a growing body of research and evidence that demonstrates the health benefits and safety of ketogenic diets. We also address why there remains stubborn resistance to low-carb/high fat diets in some nutrition circles. Plus, Gary responds to common arguments used against the ketogenic diet, ranging from health and safety and climate change to claims that ketogenic diets don’t work for women. Gary turned to journalism back in the 1970s after receiving his master’s degree in aeronautical engineering from Stanford University. Today, he continues to practice journalism and is the founder and director of the Nutrition Science Initiative. Be sure to check out part one of our interview, as well as our 2016 interview with Gary which followed the release of his New York Times best-seller “The Case Against Sugar.” Show notes: 00:02:58 Ken starts part two of our interview with Gary by mentioning that there is now substantial evidence supporting the efficacy and safety of low-carb diets. Ken mentions more and more physicians are prescribing this way of eating to their patients and large numbers of people are having success losing weight and managing type-2 diabetes using ketogenic diets. In light of that information, Ken asks Gary for his thoughts on why the U.S. News and World Report annual diet ranking stubbornly continues to describe the ketogenic diet as a detrimental way to eat. 00:09:25 Ken asks Gary to respond to some of the common arguments against the ketogenic diet ranging from human health and safety to climate change. 00:12:50 Ken asks about the claim that people on a ketogenic diet might lose a lot of weight in the short term but gain that weight back in the long term. 00:13:56 Gary tackles the criticism that ketogenic diets do not work for women. 00:16:02 Ken asks Gary to address concerns about the supposed unsustainability of ketogenic diets, noting how it is possible some people might have difficulty maintaining the diet for long periods of time. 00:19:20 Ken supposes that perhaps some of the anxiety surrounding a low-carb/high-fat diet has to do with LDL cholesterol. Ken mentions that some people on the diet, often referred to as hyper-responders, experience elevated levels of LDL and are warned by their physicians that this increases risk for heart disease. Ken asks Gary what he thinks the road forward should be for hyper-responders and others who are anxious about their LDL levels. 00:28:55 Dawn mentions that in 2018, Lancet published a study that aimed to make sense of the increasingly crowded world of low-carb diets. The authors, a team from Harvard, studied more than 15,000 American adults (aged 45-64) from four different communities over a 25-year period using dietary questionnaires. Dawn goes on to explain how these questionnaires revealed that consumers of both extremely low-carb diets and extremely high-carb diets had higher death rates over the course of the study. The lead author of this study was quoted as saying, “Our findings add to the growing evidence that animal-based low-carbohydrate diets are associated with increased mortality and therefore should be discouraged in the long term.” The last line of the paper reads, “Alternatively, when restricting carbohydrate intake, replacement of carbohydrates with predominately plant-based fats and proteins could be considered as a long-term approach to promote healthy aging.” News outlets described this paper as “the most comprehensive study of carbohydrate intake done to date.” She asks Gary to respond to this study and its conclusions. 00:39:31 Dawn asks what Gary’s ideal study design would look like to examine the safety and efficacy of the ketogenic diet. 00:42:30 Considering the recent birth of initiatives like EAT-Lancet, Dawn asks Gary if he sees the diet-science world moving in a more positive direction. 00:45:36 Ken asks Gary to elaborate on his view that the tools and equipment we use in science often shape the way researchers perceive the phenomena they observe. 00:50:21 Dawn asks Gary what it’s like being married to someone who prefers a mostly vegetarian diet. 00:51:52 Dawn mentions that even more than nutrition science or public health in this country, Gary’s interest has always been understanding the difference between good science and bad science. Dawn asks when Gary will write a book on that topic. 00:53:35 Ken mentions how the media often promulgates the notion that “science proceeds by consensus,”and that if the majority of scientists agree on a topic it is societally decided to be true. He goes on to say that this, of course, is not how science works, and the increasing attempts to squash criticism of established thinking parallel Gary’s career since the early 2000s. Ken asks if Gary has any more thoughts on this phenomenon. 00:57:12 Dawn closes the interview by asking if it is true that Gary had a high school guidance counselor who tried to put Gary in his place by saying Gary was “no Einstein.” Links: Gary Taubes bio Gary Taubes on Amazon Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio  

Today we have journalist Gary Taubes making a repeat appearance on STEM-Talk to discuss his new book, “The Case for Keto: Rethinking Weight Control and the Science and Practice of Low-Carb/High-Fat Eating.” Our interview with Gary in 2016, episode 37, followed the release of his book, “The Case Against Sugar,” which went on to become a New York Times best seller. “The Case for Keto” is Gary’s fourth book about diet and chronic disease. Gary made national headlines in 2002 when he wrote an article for the New York Times Magazine challenging the low-fat orthodoxy that had held sway in America since the 1970s. In the article, titled “What if It’s All Been a Big Fat Lie,” Gary wrote that perhaps Dr. Robert Atkins with his Atkins Diet was correct in suggesting that it’s not fat that makes us fat, but carbohydrates. Our conversation with Gary covered a lot of ground, and we have divided his interview into two parts. Today we talk to Gary about his reasons for writing the new book and how opinions on a low-carb and high-fat diet have changed over the past 20 years. In part two of our interview with Gary, we dig deeper into his efforts to set the record straight about the role of diet and weight control in preventing chronic diseases, as well as the role that diet plays in helping people improve their health spans. Gary turned to journalism back in the 1970s after receiving his master’s degree in aeronautical engineering from Stanford University. Today, he continues to practice journalism and is the founder and director of the Nutrition Science Initiative. Show notes: 00:03:43 Dawn welcomes Gary back to STEM-Talk and asks how things went for him as a writer during COVID-19 and the lockdowns. 00:04:24 Dawn gives some background on Gary’s new book The Case for Keto, which is his fourth book to follow and expand upon a 2002 article he wrote for the New Times Magazine titled, “What if It’s All Been a Big Fat Lie?” She asks Gary if he ever anticipated writing four books about the relationship between diet and chronic disease when the article came out 20 years ago. 00:06:09 Ken mentions that Gary’s New York Times Magazine article questioned the effectiveness of low-fat diets, which the government’s dietary guidelines had been recommending since the late 1970s. Ken adds that almost overnight Gary become public health enemy number one, and asks Gary if he expected so much pushback as a result of the article. 00:10:53 Dawn describes how the release of Michael Pollan’s book The Omnivore’s Dilemma, which draws on work by both Gary and Dr. Atkins, seemed to change consumers’ eating habits. Dawn then asks Gary if he remembers seeing or being surprised by the disappearance of pasta and bread from restaurants and grocery shelves. 00:14:41 Ken notes that in the blurb Michael Pollan wrote for the jacket of Gary’s 2007 book, Good Calories, Bad Calories, Michael said the book would change the way people think about eating. While Gary’s work did not end up changing national heart, health and diet guidelines, low-carb and ketogenic diets have become quite popular since then. Ken asks Gary what he thinks is driving this interest in keto. 00:19:41 Dawn describes Gary’s 2011 best seller Why We Get Fat as a condensed summary of the research contained in Good Calories, Bad Calories combined with new research on hormonal-based weight gain. She mentions Gary’s argument that the medical community and the federal government has misinterpreted scientific data on nutrition over the past several decades in developing a U.S. food policy that recommends a low-fat diet. Dawn notes there has recently been a steady accumulation of studies supporting carbohydrate restriction and the safety of saturated fat since Gary’s first two books came out. She asks Gary if this trend has been rewarding to watch. 00:22:47 Ken mentions that Gary’s new book, The Case for Keto, is an attempt to rectify decades-old misunderstandings people have had about the ketogenic diet, weight control, and health span. Gary explains why he chose to tackle the topic. 00:27:15 Dawn notes that although the medical community is beginning to see the benefits of a ketogenic diet, many doctors still promote the low-fat Mediterranean diet because they believe it is safer in the long term. Gary outlines the relative safety of the ketogenic diet compared to a Mediterranean. 00:34:02 Ken asks Gary for his thoughts on the cartoonish portrayals of ketogenic diets that describe them as being comprised of Crisco, butter, and bacon. 00:38:55 Dawn notes that there are many degrees of carbohydrate restriction that can be termed low-carb and asks Gary if there is a threshold that people should aim for in order to derive the metabolic benefits of a low-carb diet. She also asks whether a ketogenic diet provides additional benefits over a low-carb diet that simply limits carbohydrates. 0042:49 Gary ends part one of the interview by discussing the effects of burning fat for fuel rather than carbs.

Episode 123 Steve Chien talks about AI, Mars rovers, and the possibility of intelligent alien life Today’s interview is with Dr. Steve Chien.  Dr. Chien is JPL Fellow, Senior Research Scientist, and Technical Group Supervisor of the Artificial Intelligence Group and in the Mission Planning and Execution Section at the Jet Propulsion Laboratory, California Institute of Technology. In 2018, Steve and Ken were appointed to the National Security Commission on Artificial Intelligence, an independent commission tasked with providing the President and Congress a blueprint for advancing AI and associated technologies to address future national security and defense needs of the United States. The commission recently released a 756-page reportwhich found that the nation is unprepared to compete in a future enabled by AI and that the U.S. could soon be replaced as the world’s AI superpower. The report was two years in the making and offers strategies and recommendations to strengthen and protect the nation’s economy, technology base, and national security. In today’s podcast, we talk to Steve about the report and what he learned over the past two years serving on the commission. Steve heads up the Artificial Intelligence Group at JPL.  JPL is the lead for deep space robotic exploration for NASA. For the past several years, he has worked on the Perseverance Rover mission, which landed on Mars back in February and used an automated ground-based scheduling system called Copilot that Steve and his JPL colleagues developed. Steve joined JPL more than 30 years ago and last year was named a JPL Fellow, an honor that recognizes people who have made extraordinary technical and institutional contributions to the Jet Propulsion Laboratory over an extended period. He is a graduate of the University of Illinois Urbana-Champaign where he earned a doctorate in computer science. Show notes: 00:04:09 Dawn opens the interview welcoming Steve to the show and asking about his background. Dawn mentions that Steve grew up in Urbana-Champaign, Illinois, where he enjoyed basketball, Dungeons and Dragons and attempting to reinvent Decision Theory. 00:05:33 Dawn asks how Steve ended up as a computer science major rather than an economics major. 00:07:01 Dawn asks Steve if it is true that he graduated from the University of Illinois with a bachelor’s degree in computer science at the age of 19. 00:07:41 Dawn asks Steve what he did after attaining his Ph.D. 00:09:18 Ken asks Steve to describe his interest in the search for life beyond earth. 00:11:0 Ken mentions that Pascal Lee, a planetary scientist from NASA Ames Research Center, recently discussed the search for intelligent life in our galaxy on STEM-Talk, episode 121. Ken explains that the discussion centered around the Drake Equation, which was developed to produce a probabilistic estimate of the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy, with Pascal’s conclusion being that the solution to the Drake Equation is likely N = 1. Ken asks Steve about his thoughts on the likelihood of intelligent life in our galaxy. 00:14:23 Dawn mentions that the Perseverance rover is currently maneuvering across the surface of Mars. She asks Steve, as the head of the Artificial Intelligence Group at JPL, NASA’s lead for deep-space robotic exploration, if he could talk about the work he specifically did on the Perseverance rover including the rover’s scheduling system. 00:16:38 Ken mentions that the success of the Perseverance mission so far has rekindled discussions of sending humans to Mars. Ken asks what Steve’s thoughts are on Pascal Lee’s proposal to take a measured approach to sending humans to Mars and that we should first return to the Moon. 00:18:47 Dawn asks Steve about the purpose of the 756-page report by the National Security Commission on Artificial Intelligence that Ken and Steve worked on for more two years. 00:20:16 Dawn asks Steve for his thoughts on the case being made in the media that China is on the verge of replacing the U.S. as the world’s AI superpower. 00:22:13 Ken mentions that in 2016 the National Security Agency was hacked and some of the agency’s cyber tools and code were leaked for any nation, cybercriminal, or terrorist to use, with Russia exploiting some of these leaked cyberweapons to shut down Ukraine in 2017. Ken goes on to mention that he and Steve’s report explains that the limited use of AI-enabled attacks to date represents the tip of the iceberg, and he asks Steve to explain the risks we face in this new and developing AI-enabled world. 00:26:19 Dawn explains that the commission’s report details how AI will enable new levels performance and autonomy for weapon systems, which of course raises several ethical and strategic issues. When it comes to the use of lethal force, Dawn asks Steve how can we ensure that AI-enabled and autonomous weapons are used in safe, reliable, and appropriate ways. 00:28:27 Ken states that for decades, the U.S. led the microelectronics industry. Today, however, we are almost entirely reliant on foreign sources to produce the semiconductors that power the AI algorithms used for our defense systems and other technologies. Ken asks how important it is for the U.S. to recommit to rebuilding a state-of-the-art microelectronics industry domestically. 00:29:56 Dawn explains that the commission and its report spent a lot of time focused on AI and the competitive challenges the U.S. faces from other nations. She goes on to ask if it is also important that we maintain our world-standing as the overall technological leader beyond just AI. She asks Steve how the U.S. can ensure that we are competitive in a world dominated by AI-associated technologies such as biotechnology, quantum computing, 5G, robotics and microelectronics. 00:32:12 Ken asks Steve to address the vital importance of getting a sufficient portion of our most talented kids in the U.S. interested in STEM. 00:34:39 Steve explains why he believes that we need to get more kids and adults interested in practical statistics. 00:39:51 Dawn closes the interview asking Steve what he likes to do in his spare time. Links: Steve Chien bio NSCAI website Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio    

In today’s episode, we talk about zombie cells, a term used to describe senescent cells because of their refusal to die. Our guest on this topic is Dr. James Kirkland, a geriatrics specialist and researcher at the Mayo Clinic in Rochester, Minnesota, who is known for his research into the role that senescence and senescent cells have on age-related dysfunction and chronic disease. As senescent cells build up in the body, they promote cellular aging and a host of chronic conditions related to aging, such as dementia, cancer, atherosclerosis, diabetes and arthritis. In today’s interview, we focus on Jim’s 2015 study where he and his colleagues at Mayo were the first to report on the potential of senolytic drugs to selectively kill zombie senescent cells. Jim’s paper in Aging Cell has been hailed as a major breakthrough in aging research. Jim is the director of the Robert and Arlene Kogod Center of Aging at Mayo and the president of the American Federation for Aging Research. The goal of James’ lab and research is to develop methods to remove senescent cells to delay, prevent, alleviate or partially reverse age-related chronic diseases.  Jim and his colleagues believe that doing this will help extend people’s health span, and, more important, prolong the period of life where people can live free of disabilities caused by chronic disease. Show notes: 00:03:20 Jim starts the interview talking about growing up in Canada. 00:03:31 Dawn asks him when he became interested in science. 00:04:05 Ken mentions that he understands that Jim had an interest in becoming a physician at a very early age, and given Jim’s previous comments, asks if it was Jim’s childhood observations of his grandparents’ aging that drove his interest in geriatrics. 00:04:39 Dawn asks how Jim ended up at the University of Toronto. 00:04:51 Dawn mentions that Jim received his medical degree in 1977 and completed his residency at Toronto General Hospital. Dawn goes on to ask why, after this, did Jim decide to go overseas to study at the University of Manchester. 00:05:37 Dawn mentions that after Jim’s experience in Manchester, he moved back across the Atlantic to work at the National Institutes of Health (NIH), where he mainly studied adipose tissue. 00:06:11 Dawn asks what role Jim’s research at NIH played in his Ph.D., which he earned from the University of Toronto in 1990. 00:07:19 Dawn mentions that in 2007 Jim became the director of the Kogod Center on Aging at the Mayo Clinic and asks how Jim ended up at that position. 00:07:54 Dawn asks Jim to clarify the difference between lifespan and healthspan. 00:09:26 Ken mentions that Jim’s research throughout his career has focused on cellular aging and senescent cells. Ken asks what initially triggered Jim’s interest in senescence. 00:11:42 Dawn mentions Jim’s 2015 paper in Aging Cell, where Jim and his colleagues at the Mayo Clinic were the first to report on the potential of senolytic drugs, which selectively kill senescent cells. Dawn goes on to ask Jim about his research leading up to this breakthrough paper. 00:14:47 Dawn asks Jim to talk about two senolytic compounds that he and his colleagues identified called dasatinid and quercetin, and what the significance of their discovery is. 00:17:20 Ken mentions the senolytic agent called fisetin, which is another agent showing benefit in rodent studies and is now being used in human clinical trials. Ken mentions that some authors have described fisetin as having roughly twice the senolytic potency as quercetin. Ken asks Jim to explain where fisetin fits into the senolytic landscape. 00:19:18 Dawn mentions that Jim began his aforementioned 2015 paper by writing about how the research shows that the healthspan of mice is enhanced by killing senescent cells using a transgenic suicide gene. Jim goes on in that paper describing how a series of experiments by he and his colleagues demonstrated the efficacy of senolytics to alleviate symptoms of frailty and extend health span. Dawn asks Jim to explain the process and results of these experiments. 00:22:13 Dawn mentions that not only did Jim’s findings support the idea that senescent cells could one day be used for treating cardiovascular disease and frailty, but also raised the possibility that these agents have the potential to target a multitude of disorders. Dawn asks Jim to explain this potential and why he believes that the clinical application of senolytic agents could be transformative. 00:24:31 Dawn explains that Jim followed up on his 2015 paper with a clinical trial involving a small group of diabetic kidney patients. This trial led to the publishing of “Senolytics Decrease Senescent Cells in Humans” in The Lancet. Jim explains how this study was designed. 00:27:38 Ken brings up Jim’s 2018 paper in Nature Medicine titled “Senolytics improve physical function and increase lifespan in old age.” Ken asks Jim to describe how he was able to demonstrate that with senolytic drugs he could delay the onset of virtually all age-related diseases that kill mice. 00:31:52 Dawn mentions that despite the promising potential of senolytic drugs, Jim cautions that there could be dangerous side effects, and that people should not be taking these drugs yet. Jim explains his safety concerns, as well as his estimated length of time it will take to test the safety of such anti-aging drugs. 00:33:42 Ken mentions that some STEM-Talk listeners have been experimenting with fisetin on themselves, using the Mayo protocol, which involves taking 20 mg/kg body weight of oral fisetin on two consecutive days and repeating the same dose, one month later. Ken asks if this is the same protocol used in the human clinical trials of fisetin. 00:36:02 Dawn mentions that diabetes and obesity are also associated with the accumulation of senescent cells in fat and other tissues. She mentions that Jim’s paper in Aging Cell in 2019 implicated cellular senescence as a causal factor in obesity-related inflammation and metabolic derangements. Jim explains how he was able to demonstrate that senolytic agents show promise in terms of treating obesity-related metabolic dysfunction and its complications. 00:37:59 Jim talks about a more recent paper he published in Nature Communications that explored the possibility of transplanting organs from older doners to younger recipients. In this study Jim did heart transplants from old mice to young mice as well as young mice to old mice. Jim explains what he found in this study and what its potential significance is. 00:41:39 Ken mentions that Jim’s lab has a number of human clinical trials underway and asks Jim to share the range of conditions which these trials are reviewing. 00:43:36 Ken explains that at IHMC researchers are very interested in skeletal muscle, both in the context of aging and human spaceflight. Ken talks about the declines in physical functioning Jim mentioned in his aforementioned 2018 paper. Ken wonders if after transplantation of senescent cells into mice, if there were a direct or local role for senescence in skeletal muscle cells in the mechanisms of frailty with aging.  If so, Ken asks if there is any evidence so far that specific tissues can be targeted with senolytics. 00:45:27 Ken asks if senescence plays a possible role in muscle atrophy associated with human spaceflight. 00:46:49 Ken asks if bedrest increases senescence. 00:48:28 Dawn mentions that Jim’s 2017 paper in the Journal of American Geriatrics Society titled “The Clinical Potential of Synolytic Drugs” is a good primer for those listeners interested in learning more about these agents. Dawn mentions that since this paper is more than four years old, she wonders if there is anything new Jim would add to it. 00:51:26 Dawn closes the interview asking if Jim feels good about the work his lab is doing and if he feels like he is making progress toward his goal of slowing down and even reversing the symptoms of aging. Links: James Kirkland bio Robert and Arlene Kogod Center of Aging Mayo Clinic Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio    

It has been nearly a month since NASA’s Perseverance rover landed on Mars. So far, the rover hasn’t detected any signs of past life on the planet. But scientists have determined that several of the rocks on Mars are chemically similar to volcanic rocks on Earth. This, of course, has caused quite a bit of buzz. So, the double-secret-selection committee decided it was a perfect time to invite the chairman of the Mars Institute onto the show to get his take on the Perseverance and the Mars Mission so far. Actually, this is Dr. Pascal Lee’s second appearance on STEM-Talk. Pascal is a planetary scientist and director of the NASA Haughton-Mars Project at NASA Ames Research Center who was our guest in 2016 on episode 17.  Back then we talked to Pascal about his annual visits to the High Arctic’s Devon Island, which is the Earth’s largest uninhabited land that has geological characteristics similar to what scientists believe we will find on Mars. Today we catch up with Pascal and his Haughton-Mars Project. We also talk to him about Perseverance and a host of other Mars-related topics. We ask Pascal if he thinks we’ll find signs of life on Mars, or if he believes we will ever find signs of alien life in our galaxy. We also get Pascal’s thoughts about future manned missions to Mars and whether humans will ever colonize the Red Planet. And after listening to today’s interview, be sure to check out Pascal’s artwork and his recent paintings of Mars. Show notes: 00:03:15 Dawn opens the interview welcoming Pascal back to STEM-Talk, mentioning that the last time he was on the podcast he was about to spend his 20th consecutive summer on Devon Island, the Earth’s largest uninhabited land with geological characteristics similar to what Pascal believes we will find on Mars. Dawn goes on to mention that due to COVID-19, last year’s trip to Devon Island was canceled and asks him about his disappointment. 00:05:11 Ken asks if Pascal is confident that he’ll return to Devon Island this coming summer. 00:05:36 Dawn mentions that it takes several stops and trips to reach Devon Island. She asks who makes those travel arrangements and how the journey plays out. 00:08:25 Ken asks about Pascal’s polar bear guard dog, Apollo, inquiring as the protocol when Apollo alerts the team about a nearby polar bear. 00:10:48 Dawn mentions the Webby Award-winning documentary filmed by a team at Google who came to visit Pascal on Devon Island in 2018 called “Mars on Earth: A Visit to Devon Island”. Dawn asks Pascal what he thought of the documentary. 00:12:20 Ken asks Pascal to elaborate on the space suit that he was planning to test on Devon Island last summer but couldn’t because the trip was canceled. 00:16:39 Dawn asks about the glove Pascal wants to test that may enable single-handed drone operation. 00:20:11 Dawn mentions that the atmosphere of Mars is around 60 times less dense than the Earth’s. She asks Pascal about the challenges of flying a drone on Mars. 00:22:15 Dawn asks Pascal to elaborate on his recommendation that scientists study the Inuit culture and history in relation to long-duration space travel. 00:26:01 Ken mentions NASA’s Perseverance rover, which landed on Mars in February and relates that Steve Jurczyk, the NASA acting administrator, described Perseverance’s landing on Mars as a pivotal moment for the United States and space exploration. Given that NASA has landed rovers on Mars before, Ken asks Pascal what makes this particular landing especially significant. 00:28:10 Dawn mentions that NASA recently released recordings of the Perseverance rover driving on the surface of Mars. Dawn goes on to ask what the particular significance is of the audios. 00:29:41 Dawn asks what NASA means when it describes Perseverance as a “robotic astrobiologist.” 00:32:36 Ken asks Pascal to discuss the Mars helicopter, Ingenuity, that made its flight to mars attached to the belly of Perseverance. Pascal describes some of the challenges NASA and its engineers face in attempting to produce powered flight on the surface of Mars. 00:41:06 Dawn mentions that Perseverance is just one of three Mars missions that are currently underway. She explains that The United Arab Emirates and China also have crafts that have reached Mars, with all three of these missions being launched in July of 2020. Dawn asks Pascal to explain what he knows about both of these missions. 00:43:56 Ken asks if Pascal knows what type of entry, decent, and landing method the Chinese mission is employing. 00:45:01 Ken asks Pascal to describe the leading theory regarding what happened to the water that may have once been on the surface of Mars. Pascal also explains his own theory on this topic. 00:51:15 Ken asks Pascal to describe how he would go about testing his theory regarding the water of ancient Mars if he were the NASA Administrator. 00:59:15 Dawn mentions Avi Loeb, who is a Harvard astrophysicist and author of the book, “Extraterrestrial: The First Sign of Intelligent Life Beyond Earth,” argues that aliens have already visited the Earth. Given recent news stories about the uptick of reports from Navy and Air Force pilots observing UFOs, Dawn asks Pascal if he believes we are alone in our galaxy. 01:09:54 Pascal gives his thoughts on what is behind all the UFO sightings often talked about in the media. 01:13:16 Dawn asks Pascal to elaborate on his thought that a manned mission to Mars will require a measured approach consisting of several milestones, including taking a round trip to Mars without landing. 01:18:57 Ken mentions that he agrees with Pascal’s perspective that Phobos and Deimos, the two moons of Mars, are a spectacular choice for human exploration. 01:22:14 Ken mentions that in addition to being a planetary scientist, Pascal is an accomplished artist. Ken asks if Pascal was able to get more painting done this year as a result of COVID-19. 01:23:18 Dawn asks Pascal to name some of his what some of his favorite pieces of artwork. 01:24:44 Dawn mentions that the last time Pascal was on STEM-Talk, Pascal got the chance to talk about his children’s book “Mission to Mars,” written in the hopes of inspiring children to take an interest in science and space travel. Dawn goes on to say that Pascal had also mention that he was working on a book for adults tentatively titled “From Earth to Mars.” Dawn asks how that book is coming. 01:25:17 Dawn closes the interview asking Pascal to elaborate on his thoughts that we are on the verge of a great age of the renewal of human exploration. Links: Pascal Lee bio Pascal Lee artwork Learn more about IHMC STEM-Talk homepage Ken Ford bio Ken Ford Wikipedia page Dawn Kernagis bio