"My brain used to be my best friend," says Greg O'Brien, a journalist with early onset Alzheimer's. But he can't trust it anymore, he says. Alzheimer's is, in some ways, changing who he is. Amanda Kowalski and Samantha Broun for NPR hide caption

toggle caption Amanda Kowalski and Samantha Broun for NPR

In A Metal Mood? You Might Just Be More Analytical Than Easier Listeners

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Humans make split-second judgments about others based on the way they talk. Katherine Streeter for NPR hide caption

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You Had Me At Hello: The Science Behind First Impressions

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How Can Identical Twins Turn Out So Different?

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