We all know people who prefer to follow the rules, and others who prefer to flout them. Psychologist Michele Gelfand defines these two ways of being as "tight" and "loose." She says the tight/loose framework can help us to better understand individuals, businesses, and even nations. This week, we look at the core traits of tight and loose worldviews, and how they may shape our lives — from interactions with our spouses to global efforts to fight the coronavirus.

A silver lining of social distancing: you may have more time and space to pursue the projects you've bookmarked on your web browser. Whether your goal is to build a barn door or to update your makeup routine, online tutorials have made it easier than ever to bring the world into your living room or kitchen or bedroom. But a curious thing can happen when we watch experts doing expert things. This week, we explore the dangers and the delights of vicarious living, with a favorite episode from 2019.

A virus is more than a biological organism. It's a social organism. It detects fissures in societies and fault lines between communities. Historian Nancy Bristow shares the lessons about human behavior that we can take away from a century-old pandemic.

It sounds like a movie plot: police discover the body of a young man who's been murdered. The body tests positive for a deadly infectious disease. Authorities trace the killing to a gang. They race to find the gang members, who may also be incubating the virus. This week on Hidden Brain, we revisit our 2016 story about disease, panic, and how a public health team used psychology to confront an epidemic.

We know that we live in an ever-changing world, but one thing we often overlook is demographic change. Whether the world's population is growing or shrinking can affect many aspects of our lives, from the number of kids we have to the likelihood that we'll live to old age. This week on Hidden Brain, we explore how our planet's population is changing, and what that means for us in the century to come.

In 2009, an old man died in a California nursing home. His obituary included not just his given name, but a long list of the pseudonyms he'd been known to use. In this episode, which we originally released in 2019, we trace the life of Riley Shepard, a hillbilly musician, writer, small-time con man and, perhaps, a genius.

Think about the last time you asked someone for something. Maybe you were nervous or worried about what the person would think of you. Chances are that you didn't stop to think about the pressure you were exerting on that person. This week, we explore a phenomenon that psychologists refer to as "egocentric bias," and look at how this bias can lead us astray.

Editor’s note: Since this episode first aired, researchers have raised concerns about a number of studies authored by Dan Ariely, including one cited in this episode. That study included data from an insurance company that purported to show that people are more truthful when they sign an ethics declaration at the beginning of a form than at the end. In an independent review, a group of researchers found evidence of data fabrication in that study. You can read more about their findings here, along with Dan Ariely’s response. The insurance company that provided the data, The Hartford, released a statement to NPR’s Planet Money in July 2023. In that statement, the company said that it had done a review of its records and that “there appear to be significant changes made to the size, shape and characteristics of our data after we provided it and without our knowledge or consent.” You can hear the full Planet Money story and read the full statement from The Hartford here. Additionally, a second study cited in this episode – in which Ariely reported reduced cheating among test-takers asked to recall the Ten Commandments before taking the test – has not stood up to replication by other researchers. You can read more about that here. We all lie. But what separates the average person from the infamous cheaters we see on the news? Dan Ariely says we like to think it's character — but in his research he's found it's more often opportunity. Dan Ariely is a professor at Duke University and the author of the book, The Honest Truth About Dishonesty: How We Lie to Everyone — Especially Ourselves. We spoke to him in March 2017.

Many Americans feel an obligation to keep up with political news. But maybe we should be focusing our energies elsewhere. Political scientist Eitan Hersh says there's been a rise in "political hobbyism" in the United States. We treat politics like entertainment, following the latest updates like we follow our favorite sports teams. Instead, he says, we should think of politics as a way to acquire power and persuade our neighbors to back the issues we support.

There can be a lot of psychological noise involved in teaching. But what if we replaced all that mental clutter...with a click? This week, we bring you a 2018 episode exploring an innovative idea about how we learn. It will take us from a dolphin exhibit in Hawaii to a top teaching hospital in New York. It's about a method to quiet the noise that can turn learning into a minefield of misery.