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Do you smell your hands after a handshake?

Unlike dogs and other animals, humans — for the most part — don’t sniff each other. Well, at least that’s what we thought. A rather unsettling new study from the Weizmann Institute shows that practically all of us sniff our hands after handshaking — a possible sign of social chemosignaling behavior.

The new study, published in the journal eLife, suggests that humans use handshakes to exchange important chemical information — information that can alter our behavior is subtle ways. The researchers came to this conclusion by covertly filming 271 subjects as they they were being greeted in a structured event, some with a handshake and some without.

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