Every day, we leave small traces of ourselves online. And we might not realize what these traces say about us. This week, computational social scientist Sandra Matz explores how understanding what we actually do online – not just what we think we do – can help us improve our lives.

Looking for a last-minute holiday gift for a fellow Hidden Brain fan? You can now give a gift subscription to Hidden Brain+!

With the holidays fast approaching, many of us are hunting for that special something for the special someones in our lives. It’s how we show we care about them. So why is it so hard to find the right gift? This week, we revisit a favorite 2022 conversation with researcher Jeff Galak. We'll discuss why the presents we give for holidays and birthdays often miss their mark, and how to become a better gift-giver.

Looking for a holiday gift for a fellow Hidden Brain fan? You can now give a gift subscription to Hidden Brain+! Or if material gifts are more your style, go to shop.hiddenbrain.org to find Hidden Brain t-shirts, mugs, stickers and more.

What makes ordinary people do evil things? It was a question that long fascinated the psychologist Philip Zimbardo, who died in October. Zimbardo was best known for the controversial Stanford prison experiment, in which he created a simulated prison in the basement of a university building and recruited volunteers to act as prisoners and guards. This week, we explore how Zimbardo came to create one of psychology's most notorious experiments – and inadvertently became the poster child for the human weaknesses he was trying to study.

We're bringing Hidden Brain to the stage in San Francisco and Seattle in February 2025! Join our host Shankar Vedantam as he shares seven key insights from his first decade hosting the show. Click here for more info and tickets.