Science History Podcast

Certain fields of science attract broad interest because of what they tell us about humanity, and no field does this more directly than paleoanthropology. Today we explore the history of paleoanthropology with a focus on Louis and Mary Leakey, who made key discoveries at an inflection point of our understanding of human evolution. With us to discuss this history is Evan Hadingham. Evanis the Senior Science Editor of the award-winning PBS series NOVA. Today we discuss his new book, Discovering Us, Fifty Great Discoveries in Human Origins, published in partnership with the Leakey Foundation in 2021.

How could a conservation easement be anything other than a great thing? With us to answer this question are Jaimi Dowdell and Andrea Januta, both of whom are investigative reporters and data journalists with Reuters. Jaimi and Andrea were part of the Reuters team that won the 2021 Pulitzer Prize in Explanatory Reporting. Today we discuss their Reuters special report entitled "How Boeing created a nature preserve that may also preserve pollution", published on July 20, 2022.

For thousands of years, scholars have struggled with what it means to be human. One critical dimension of humanity is foresight, and with us to decipher the evolution of foresight is Thomas Suddendorf. Thomas is a professor at the University of Queensland, where he investigates mental capacities in young children and in animals to answer fundamental questions about the nature and evolution of the human mind. Thomas is the author of over 140 research articles and two books: The Gap: The science of what separates us from other animals, published in 2013 by Basic Books, and The invention of tomorrow: a natural history of foresight (with co-authors Jonathan Redshaw and Adam Bulley), published in 2022, also by Basic Books.  Today we discuss archaeological finds related to stone tools, fire, hunting, ornaments, containers, burial, watercraft, maps, music, and storytelling - and what they tell us about the evolution of foresight.

Johan Rockström and colleagues first proposed the concept in 2009 of planetary boundary threats and a safe operating space for humanity. This conceptual framework clarifies environmental problems that are of planetary significance, such as biodiversity loss, climate change, and stratospheric ozone depletion. The most recently articulated planetary boundary threat, or set of threats, relates to chemical pollution of the biosphere. With us to unpack planetary boundary threats as they relate to pollution is Bethanie Carney Almroth. Bethanie is a professor at the University of Gothenburg, where she researches threats posed to our planet due to the immense number and quantities of synthetic chemicals released into the environment.

The Wall Street Crash of 1929 and the ensuing worldwide Great Depression left families in economic shock and despair. International trade collapsed to less than half of its previous levels and unemployment skyrocketed. Into this devastating mess stepped Franklin Delano Roosevelt, who began his long presidency in 1933. FDR spearheaded a series of programs known as the New Deal to revive the United States. The most popular of these was the government work relief program called the Civilian Conservation Corps, which ran from 1933 to 1942. Three million American men joined the Corps, gaining skills and employment while also attending to widespread conservation problems. With us to explain the significance of the Civilian Conservation Corps is Neil Maher. Neil is a professor of history in the Federated History Department at the New Jersey Institute of Technology and Rutgers University, Newark, and he is the author of Apollo in the Age of Aquarius and Nature’s New Deal: The Civilian Conservation Corps and the Roots of the American Environmental Movement.

The ways people think about matters both big and small, from climate change to daily tasks, impact the outcomes. Throughout the history of science and society, key insights arose through a thought process of simplification and subtraction, though the human tendency leans towards complication and addition. Today I discuss the power of subtraction with Leidy Klotz. Leidy is a professor at the University of Virginia, where he studies the science of design. He is the author of Subtract, published in 2021 by Flatiron Books.

In this engaging discussion, Jim Zimring, a seasoned author and scientist, reveals how our perceptions are colored by inherent biases shaped by evolution and culture. He humorously unpacks the complexities of reasoning, particularly through the lens of fractions and logical fallacies. Topics like the 'No True Scotsman' fallacy and cognitive shortcuts are explored, illustrating their impacts on decision-making. Jim also tackles the struggle between anecdotes and statistics, emphasizing the need for critical thinking in interpreting data and understanding the fine line between belief and scientific evidence.

The oceans have been used as the dumping grounds for all manner of toxic waste. Outrage over such dumping led to the Marine Protection, Research, and Sanctuaries Act of 1972 in the United States and the London Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter in 1975. Today I discuss the dumping of DDT and other wastes off the coast of Southern California with Dave Valentine. Dave completed a BS in chemistry and biochemistry at the University of California San Diego in 1995, followed by an MS in chemistry also at UCSD the following year. He then completed MS and PhD degrees in earth system science at the University of California Irvine in 1998 and 2000. Dave is now the Norris Presidential Chair in Earth Science at UC Santa Barbara. He has participated in 25 oceanographic expeditions, including 13 as chief scientist.

Many landmarks of environmental history share a connection with a single molecule: DDT. During and after the Second World War, it was broadcast into the environment at a scale that far surpassed the applications of any prior chemical. The public met this mass spraying of DDT with enthusiasm, as the war proved it to be highly effective against the vectors of malaria, yellow fever, typhus, and other insect-borne diseases. But these public health successes were short-lived as insects quickly evolved resistance. Nevertheless, DDT use skyrocketed around the world, especially in agriculture. It was also used on a massive scale in forestry, in the Sisyphean fight against invasive insects, and in the home, where clever companies impregnated all manner of commercial products with DDT, ranging from bug bombs to house paint to wallpaper for the nursery. Due primarily to its massive impact on the environment, but also to effects on human health, a backlash ensued, driven most forcefully by Rachel Carson’s 1962 book Silent Spring. The chemical was banned throughout the world in the 1970s and 80s, and yet its story continued. With us to unravel this complex tale, and its relation to science denial and corporate malfeasance, is Elena Conis. Elena is a historian of medicine and an Associate Professor in the Graduate School of Journalism and Department of History at the University of California, Berkeley. Her research focuses on scientific controversies, science denial, and public understanding of science. She is the author of Vaccine Nation: America’s Changing Relationship with Immunization, and a co-editor of Pink and Blue: Gender, Culture, and the Health of Children. Today we discuss her most recent book, How to Sell a Poison: The Rise, Fall, and Toxic Return of DDT.

At the start of the 20th century, physicists probed the structure of nature. Their discoveries changed our fundamental understanding of matter, of life, and of war. At the center of these discoveries stood the Danish physicist Niels Bohr. Bohr approached problems of atomic structure and quantum theory with a philosophical perspective and an ability to skirt paradoxes with his principle of complementarity. Perhaps as important as Bohr’s discoveries on the atom was his hosting of international collaborations at his institute in Copenhagen, which in turn led to fundamental insights in physics and chemistry. Bohr also played significant humanitarian and diplomatic roles during World War II in Denmark, Sweden, the United Kingdom, and the United States. Many Jewish refugee scientists passed through Bohr’s institute after escaping Nazi Germany, and Bohr then facilitated their immigration to safe harbors. With us to decipher Bohr’s complex legacy is John Heilbron. John is a member of the International Academy of the History of Science, for which he served as president from 2001-2005. He is also a member of The Royal Swedish Academy of Sciences, The American Academy of Arts and Sciences, and The American Philosophical Society. He is the recipient of many awards for his scholarship on the history of science.