The desire to find our tribe is universal. We like to know who we are and where we belong. This fascination has led to a thriving industry built on the marketing and sale of personality tests. These tests offer individuals – and, increasingly, employers – quick and easy insights that can be used to make some of life's biggest decisions. But most fail to stand up to scientific scrutiny. This week, we revisit our 2017 episode about the world of personality testing, and explore the many different ways we assess personality and potential – from the Chinese zodiac to Harry Potter houses to the Myers-Briggs test.

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For generations, living openly as a gay person in the United States was difficult, and often dangerous. But there's been a dramatic change in public attitudes toward gay people. This week, we explore one of the most striking transformations of public attitude ever recorded. And we consider whether the strategies used by gay rights activists hold lessons for other groups seeking change.

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Chaos is a part of all of our lives. Sometimes we try to control it. And other times, we just have to live with it. On this week's Hidden Brain, we bring you two of our favorite stories about coping with chaos. They come from our 2016 episodes "Panic in the Streets" and "Embrace the Chaos."

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Twin studies aren't just for twins. They're a paradigm for all of us, a way to explore an old question: how much are we shaped by our genes, and how much by our environment?

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All social classes have unspoken rules. From A-list celebrities to teachers, doctors, lawyers, and journalists — there are social norms that govern us, whether we realize it or not. This week on Hidden Brain, we look celebrity culture, as well as another elite group: the yoga-loving, Whole Foods-shopping, highly-educated people whom one researcher calls the new "aspirational class." This episode is from December 2017.

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From stone statues to silicone works of art, we have long sought solace and sex from inanimate objects. Time and technology have perfected the artificial lover: today we have life-size silicone love dolls so finely crafted they feel like works of art. Now, with the help of robotics and artificial intelligence, these dolls are becoming even more like humans. This week we talk with researcher Kate Devlin about the history of the artificial lover, and consider what love and sex look like in the age of robots.

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You own your body. So should you be able to sell parts of it? This week, we explore the concept of "repugnant transactions" with the man who coined the term, Nobel Prize- winning economist Al Roth. He says repugnant transactions can range from selling organs to poorly-planned gift exchanges — and what's repugnant in one place and time is often not repugnant in another.

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Annie Duke was about to win $2 million. It was 2004, and she was at the final hand of the World Series of Poker Tournament of Champions. But as a woman at a table full of men, she wasn't sure she deserved to be there. In this week's Radio Replay, we tell the stories of two people who grappled with gender stereotypes on the job. Annie Duke shares her experiencing at the World Series of Poker, and then we hear the story of Robert Vaughan, a former Navy sailor who decided to pursue a new career as a nurse.

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Our modern world is saturated with awards. From elementary school classrooms to Hollywood to the hallways of academia, there's no shortage of prizes. But — do they work?

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The eugenicists were utopians, convinced that they were doing hard but necessary things. And that included making decisions about who could have children.

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