Shankar Vedantam

In moments of anger, it can be hard to take a deep breathor count to ten. But public health researcher Harold Pollack says five minutes of reflection can make all the difference between a regular life and one spent behind bars. This week, we visit a Chicago program that helps young men learn how to pause and reflect. Plus, we ask whether we should think of violence as a disease, similar to a blood-borne pathogen in its ability to spread from person to person.

What does the song “Satisfaction” by The Rolling Stones have in common with the periodic table of elements? Both are the products of dreams. The sleeping brain is far more active than we realize, argues neuroscientist Matthew Walker in this second part of our series on sleep.

Randy Gardner broke a world record in 1963, when he was only 17 years old. His feat? Going 11 days without sleeping. Randy, now 71, shares his wisdom about staying up past your bedtime — and why none of us should attempt to recreate his teenage stunt — on this week’s Hidden Brain.

Discussions about healthy living usually revolve around diet and exercise. Social interaction is often left out of the conversation, even though research shows that it’s critical to our well-being. On this week’s radio replay, we’ll explore research on the extremes of social interaction: from the consequences of constant connection, to the high cost of solitary confinement.

Coincidences can make the everyday feel extraordinary. But are they magical, or just mathematical? On this week’s Radio Replay, we explore our deep fascination with these moments of serendipity. New research suggests they reveal important things about how our minds work, and have a far more powerful effect on our lives than any of us imagine. We’ll also explore the phenomenon of “implicit egotism” — the idea that we’re drawn to people and things that remind us of ourselves.

We don’t always do what we’re supposed to do. We don’t save enough for retirement. We order dessert — even when we’re supposed to be dieting. In other words, we misbehave. That’s the title of Richard Thaler’s most recent book: Misbehaving: The Making of Behavioral Economics. If you’ve read Thaler’s previous book, Nudge, you know he’s an economist who studies why people don’t really act the way traditional economists say they will. Thaler recently won a Nobel Prize for his contributions to the field of behavioral economics — so we thought we’d celebrate by giving you this encore episode. It’s still one of our favorites.

Is nostalgia an emotion that’s bitter, or sweet? Why are we so often pulled into memories of the past? This week on Hidden Brain, we talk about what prompts us to feel nostalgic, and the harms and benefits of this emotion. Plus, how Donald Trump employed nostalgia to win the 2016 presidential campaign.

We all have regrets. By some estimates, regret is one of the most common emotions experienced in our daily lives. This week we’ll hear listeners’ stories of regret, and talk with psychology professor Amy Summerville. She runs the Regret Lab at Miami University in Ohio. Summerville says regret doesn’t always have to be a negative force in our lives. Sometimes, it can be a hopeful emotion.

Several weeks ago, white supremacists took to the streets of Charlottesville, Virginia, in a demonstration that left many Americans asking a lot of questions. Who are we as a nation? What do we stand for, and what do we tolerate? The United States goes further than many other countries to protect speech — even hate-filled speech like that used in Charlottesville. In this episode, we look at how people use free speech arguments, and why the motivations behind these arguments may not be apparent — even to the people making them.