The political debates over immigration can generate a lot of fuzzy facts. We wanted to test Americans’ knowledge — so, to wrap up our special series on immigration, we called some Freakonomics Radio listeners and quizzed them.

Extra: How Much Do You Know About Immigration?

Freakonomics co-author Stephen J. Dubner uncovers the hidden side of everything. Why is it safer to fly in an airplane than drive a car? How do we decide whom to marry? Why is the media so full of bad news? Also: things you never knew you wanted to know about wolves, bananas, pollution, search engines, and the quirks of human behavior.

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From politics and economics to psychology and the arts, many of the modern ideas we take for granted emerged a century ago from a single European capital. In this episode of the Freakonomics Radio Book Club, the historian Richard Cockett explores all those ideas — and how the arrival of fascism can ruin in a few years what took generations to build.

586. How Does the Lost World of Vienna Still Shape Our Lives?

Five years ago, we published an episode about the boom in home DNA testing kits, focusing on the high-flying firm 23andMe and its C.E.O. Anne Wojcicki. Their flight has been extremely bumpy since then. This update includes an additional interview with the Wall Street Journal reporter who has been investigating the firm’s collapse.

Extra: Why Is 23andMe Going Under? (Update)

Justin Trudeau, facing record-low approval numbers, is doubling down on his progressive agenda. But he is so upbeat (and Canada-polite) that it’s easy to miss just how radical his vision is. Can he make it work?

585. A Social Activist in Prime Minister’s Clothing

So you want to help people? That’s great — but beware the law of unintended consequences. Three stories from the modern workplace.

584. How to Pave the Road to Hell

The psychologist Daniel Kahneman — a Nobel laureate and the author of “Thinking, Fast and Slow” — recently died at age 90. Along with his collaborator Amos Tversky, he changed how we all think about decision-making. The journalist Michael Lewis told the Kahneman-Tversky story in a 2016 book called "The Undoing Project." In this episode, Lewis explains why they had such a profound influence.

Extra: How Much Do You Know About Immigration?

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