Sleep Like a Caveman

The human urge to explore has taken us to every corner of the planet. From the highest peaks to far-flung islands to even the deepest dimensions of an idea, our species has an innate drive to venture into the unknown. But what exactly drives this need to explore? Is it genetic, cognitive, or something else entirely? Here to unpack this question is Alex Hutchinson, author of The Explorers Gene: Why We Seek Big Challenges, New Flavors, and the Blank Spots on the Map. Today on the show, Alex shares the fascinating science behind our exploratory tendencies, from the dopamine-driven "explorer's gene" that varies across populations to the universal cognitive frameworks that govern how we navigate both physical and mental landscapes. He explains the delicate balance between exploring new possibilities and exploiting what we already know, and why we sometimes find meaning in difficult challenges. We also discuss why younger people explore more than older people do, how this decline in exploration doesn't have to be inevitable, and how to keep exploring throughout your entire life.

When you think about ancient gladiators, you likely have a certain vision that comes to mind: slaves forced to fight to the death for the entertainment of bloodthirsty Romans. But much of what we think we know about gladiators is actually wrong. Today on the show, Alexander Mariotti will separate the just-as-fascinating fact from popular-culture-derived fiction when it comes to gladiatorial combat in ancient Rome. Alexander is a historian and an expert on gladiators who's served as a consultant for shows and films like Spartacus and Gladiator II. In our conversation, Alexander explains how gladiatorial games evolved from funeral rites into professional sporting events featuring the greatest superstar athletes and sex symbols of the day. We discuss the different types of gladiators, their rigorous training regimens, why gladiators fought in their underwear, and whether they actually fought to the death. Alexander describes what a day at the Colosseum was really like, complete with elaborate special effects, halftime shows, souvenirs, and even concessions. And we talk about the connections between the gladiatorial games and the sports and spectacle culture of today, and why, despite the passage of two millennia, these ancient athletes continue to captivate our imagination.

Face-to-face socializing in America has declined by more than 20% nationwide. Among some groups, like young adults and unmarried men, the drop is closer to 40%. But strangely, this hasn’t led to the loneliness epidemic that you hear so much about. Instead, we’re seeing a new phenomenon: rising aloneness without rising loneliness. Today on the show, Derek Thompson will help us understand this puzzling disconnect and its profound implications. Derek is a staff writer at The Atlantic who recently wrote a piece entitled “The Anti-Social Century.” In the first half of our conversation, Derek unpacks the cultural shifts and technological developments — and no, it’s not just the smartphone — that have created what he calls the “convenience curse.” We then get into why even self-described introverts are often happier when forced to socialize, the concerning trend of young men settling further and further into isolating, sedentary leisure, and practical ways we can strengthen our atrophied social muscles to become better, happier people.

People commonly think of time as a fixed, linear, objective structure. But our own experiences belie this belief. We’ve all been in situations where time has seemed to drag on or speed up, and there are even whole periods of our lives that seem to have gone by slower or faster. As my guest Steve Taylor will explain, time is a lot more fluid and moldable than we often recognize. Steve is a psychologist and the author of Time Expansion Experiences: The Psychology of Time Perception and the Illusion of Linear Time. Today on the show, he unpacks the four laws of psychological time. He discusses the theories as to why time speeds up as we get older and what factors slow down and speed up time. We delve into the way time particularly expands in accidents and emergencies, giving people the ability to take life-saving measures. And we discuss why some people are more likely to have time expansion experiences than others, and what you can do to slow down time and make your life feel longer as a result.

Pornography is more prevalent and accessible than ever before, yet its effects on relationships, mental health, and human development aren't popularly well understood. Discussions on the topic are often engaged in from an emotional or religious point of view; less typical is a discussion of pornography from an empirical frame. My guest today, Dr. Brian Willoughby, a social scientist who has spent the past 15 years studying porn's impacts, will unpack what the research actually says about how it affects personal well-being, relationship satisfaction, and sexual expectations. We discuss the latest data on porn use across different demographics, how porn impacts religious versus non-religious populations differently, and how exposure affects kids. Brian shares whether using porn causes erectile dysfunction and depression, what parents should know about talking to their kids about porn, the main risk of porn that's typically under-discussed, and more.