The idea of open borders -- letting people move freely between countries, taking a job wherever they can find a job they want -- is still a pretty fringe position, politically speaking. But economist Bryan Caplan makes a compelling case for it in his new graphic nonfiction book, "Open Borders: The Science and Ethics of Immigration," illustrated by cartoonist Zach Weinersmith. In this episode, Julia questions Bryan about several aspects of his case.

Philosopher of mind Keith Frankish is one of the leading proponents of "illusionism," the theory that argues that your subjective experience -- i.e., the "what it is like" to be you -- is a trick of the mind. It's a counterintuitive theory, but Keith makes the case for it in this episode, while explaining the other leading theories of consciousness and why he rejects them.

The Stanford Prison Experiment is one of the most famous psychology experiments in history. For decades, we've been told that it proves how regular people easily turn sadistic when they are asked to role play as prison guards. But the story now appears to be mostly fraudulent. Thibault Le Texier is a researcher who dug into the Stanford archives and learned that the "prison guards" were actually told how to behave in order to support the experimenters' thesis. On this episode, Thibault and Julia discuss his findings, how the experimenters got away with such a significant misrepresentation for so long, and what this whole affair says about the field of psychology.

If you want to understand why things go wrong in business, government, education, psychology, AI, and more, you need to know Goodhart's Law: "When a measure becomes a target, it ceases to become a good measure." In this episode, decision theorist David Manheim explains the dynamics behind Goodhart's Law and some potential solutions to it.

Several recent books have argued there's no difference between male and female brains. Saloni Dattani, a PhD in psychiatric genetics, discusses some of the problems with the argument, and what we really know so far about gender and the brain.

It's rare for public intellectuals to talk about things they've gotten wrong, but geneticist Razib Khan is an exception. He recently published list of 28 things he's changed his mind about in the last decade, not just in genetics, but in other fields of science, politics, society, and religion. Julia interviews Razib about some of the items on the list -- why did he change his mind, and what lessons does he feel he's learned from his past errors?

It's common wisdom that spending a lot of time on your smartphone, or checking social media like Facebook and Twitter, takes a psychological toll. It makes us depressed, insecure, anxious, and isolated -- or so people say. But is there any research to back that up? Julia discusses the evidence with professor Andy Przybylski, director of research at the Oxford Internet Institute.

Over the last two decades, the prices of consumer goods like toys and electronics have gone way down, but the prices of health care and education have gone up roughly 200%. Why? In this episode, economist Alex Tabarrok discusses his latest book, co-authored with Eric Heller, "Why are the Prices So D*mn High?," which blames rising costs on a phenomenon called the Baumol Effect.

We typically think of violence as being caused by a lack of control, or by selfish motives. But what if, more often than not, violence is intended to be morally righteous? That's the thesis of the book Virtuous Violence: Hurting and Killing to Create, Sustain, End, and Honor Social Relationships. Author Tage Rai debates his book's thesis with Julia. Plus: What does The Iliad teach us about changing attitudes about morality over time?

The global poverty rate has fallen significantly over the last few decades. But there's a heated debate, between people like psychologist Steven Pinker and anthropologist Jason Hickel, over how to view that fact. Is it a triumph for capitalism? Should we celebrate it, or lament the fact that rich countries aren't doing more to close the poverty gap faster? Vox journalist Dylan Matthews explains the disagreement. He and Julia discuss the strengths and weaknesses of each side's argument.