This week Reactions is getting to the bottom of one of the biggest quandaries in science: Why dogs sniff each other’s butts. Spoiler: it’s chemistry. Turns out this behavior is just one of many interesting forms of chemical communication in the animal kingdom. Dogs use a special feature called the Jacobsen’s Organ to get chemical signals from their nose sent directly to their brain.

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Like this episode? Check out these other Reactions videos:
Why does bacon smell so good?: https://www.youtube.com/watch?v=2P_0HGRWgXw
Zombie Apocalypse survival chemistry: https://www.youtube.com/watch?v=SUEjmyisz7c

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