Science Rules! Presents is a series of science-focused episodes from some of our favorite shows. This week we’re featuring Hidden Brain's “Humor Us.”

Hahaha! The average four-year-old child laughs 300 times a day. By contrast, it takes more than two months for the average 40-year-old adult to laugh that many times. This week, we talk with behavioral scientist Jennifer Aaker of Stanford University about why so many of us fall off a “humor cliff” as we become adults. Plus, how we can inject more laughter into our lives, even during the most difficult of times.

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Hidden Brain: Humor Us

Stitcher & Bill Nye