If you listen closely to giggles, guffaws, and polite chuckles, you can discern a huge amount of information about people and their relationships with each other. This week, we talk with neuroscientist Sophie Scott about the many shades of laughter, from cackles of delight among close friends to the "canned" mirth of TV laugh tracks.

Judy, Lyn and Donna Ulrich were driving to a volleyball game when their Ford Pinto was hit from behind by a Chevy van. The Pinto caught fire, and the three teenagers were burned to death. This week on Hidden Brain, we talk to a former Ford insider who could have voted to recall the Pinto years before the Ulrich girls were killed — but didn't. And we ask, is it possible to fairly evaluate our past actions when we know how things turned out?

If you've ever flown in economy class on a plane, you probably had to walk through the first class cabin to get to your seat. Maybe you noticed the extra leg room. The freshly-poured champagne. Maybe you were annoyed, or envious. Social psychologist Keith Payne says we tend to compare ourselves with those who have more than us, but rarely with those who have less. This week, we revisit our 2019 episode on the psychology of income inequality, and how perceptions of our own wealth shape our lives.

The United States spends trillions of dollars on healthcare every year, but our outcomes are worse than those of other countries that spend less money. Why? Physician and healthcare executive Vivian Lee explains the psychological and economic incentives embedded in the American model of medicine, and makes the case for a different way forward.

Some people are good at putting themselves in another person's shoes. Others may struggle to relate. But psychologist Jamil Zaki argues that empathy isn't a fixed trait. This week, in our final installment of You 2.0, we revisit a favorite episode about how to exercise our empathy muscles.

American culture is all about positive affirmations. Dream big! Shoot for the stars! But do positive fantasies actually help us achieve our goals? This week, as part of our You 2.0 summer series, we revisit a conversation with researcher Gabriele Oettingen about how we can make our goals more attainable.

Maya Shankar was well on her way to a career as a violinist when an injury closed that door. This week, as part of our annual You 2.0 series on personal growth and reinvention, we revisit our 2015 conversation with Maya, in which she shares how she found a new path forward after losing an identity she loved.

Some challenges feel insurmountable. But psychologist Emily Balcetis says the solutions are often right in front of our eyes. This week, as part of our annual series on personal growth and reinvention, Emily explains how we can harness our sight to affect our behavior.