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We have a special bonus mystery sound this week for you. And last Thursday on Crosscurrents, we asked you to guess what exactly it is and where exactly in the Bay Area we recorded it.

Millions of people are crazy about sports, whether or not their teams are any good. Exactly why that is is the subject of Eric Simons’ new book: The Secret Lives of Sports Fans: The Science of Sports Obsession. Simons sat down with KALW’s Ben Trefny to talk about the chemistry of fandom.