Why do some activities tire your brain more than others? How exhausting is poverty? And could most of the world’s problems be solved with a sandwich?

Are Europeans more sophisticated than Americans? What’s wrong with preferring Taylor Swift to Puccini? And is Steve Levitt “Team Edward” or “Team Jacob”?

Will Angela finally break up with Philadelphia? Is New York really the unhappiest city in the U.S.? And are there trash tornadoes in the metaverse?

Are you a problem solver or an opportunity seeker? Why is it so hard to find a good leader these days? And could you be Angela’s next boss?

What risks are worth taking? When should you ignore feedback and go with your gut? And what did Stephen learn on a fishing trip with the town barber?

What’s worse: shame, guilt, or humiliation? Does Angela have psychopathic tendencies? And where’s the worst place to sit at a magic show?

What is the purpose of negative emotions? Why do we engage with things we know will upset us? And how does Angie deal with rejection?

Is it O.K. to bother people for a good cause? Why do people donate to charity in the first place? And do those personalized address labels actually make people get out their checkbooks?

Are we all either secure, avoidant, or anxious? How does your relationship with your parents shape your romantic partnerships? And what is Stephen’s attachment style?

Are you more likely to experience post-traumatic stress or post-traumatic growth? How does belief in the afterlife affect how you view death? And why did Angela hike a deadly gorge with her ex-boyfriend?

How do kids learn about money? What’s the big problem with education? And who made "Raiders of the Lost Ark?"

Why are humans so eager for magic-bullet solutions? Can you explain how a pen works? And how does Angela feel about being forever branded “the grit lady”?

Why do Americans tip so much? What happened when Angie eliminated grading in a college course? And why did almost every pay toilet in the U.S.A. vanish between 1970 and 1980?

How does the profitability of family firms stack up against the rest? Has nepotism become more taboo over time? And why are 90 percent of adoptees in Japan not children but adults?

Where’s the line between an addiction and a bad habit? Why do definitions of mental illnesses change over time? And what’s the most addictive thing in the world?

Why does listening to No Stupid Questions feel like you’re hanging out with your best friends? Why did the whole world take it personally when Princess Diana died? And how do “parasocial relationships” affect your mental health?

Are there downsides to “personality plagiarism”? Why did no one buy the Crayola Crayon Carver? And should Stephen feel bad for copying Angela’s email signature?

Why have fertility rates dropped so dramatically? Do fathers or mothers get more happiness from parenting? And how does birth order affect a child’s future?

Why are women unhappier than men? What can we do to move the needle? And is it better to be happy or to be good?

How did Chick-fil-A become the third-largest restaurant chain in the U.S.? Why does it serve salad? And can Angie’s moral compass override her craving for a chicken sandwich?