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?

Can denial be a healthy way of dealing with the death of a loved one? What do the five stages of grief misrepresent about mourning? And why does Angie cover her eyes when she watches the Rocky movies?

What is the relationship between “catastrophizing” and anxiety? How did Angela react when her mother came close to drowning? And how can you gain perspective when the worst-case scenario is all you can visualize?

How have Angie’s views on sleep changed since she wrote her Harvard application essay? Would starting high school later in the day be worth $8.6 billion? And what should you do if your chronotype doesn’t fit the way society is structured?

Is evolution stacked against healthy eating? What policies could increase demand for nutritious food? And does Popeyes count as a cultural icon?

What’s the difference between people who preserve special things and people who devour them right away? Why do we love to binge-watch? And did Adam really eat an apple?

Why do so many Americans say they’re satisfied with their own lives but upset about the way the country is going? Why don’t other countries experience the same gap? And what do horror movies have in common with Coca-Cola enemas?