Why Do People Shake Hands?

Research suggests that people tend to sniff their own hands after shaking
hands with another person.

Most of us follow customs and manners without stopping to think why we do
them. For example, why do people shake hands? Luckily, the question
occurred to some researchers at Weizmann Institute of Science. The
researchers observed 153 volunteers and discovered that people tend to
sniff their own hands after shaking hands with another person, similar to
the way dogs test each other's scents. The study indicates that humans may
be using social chemosignalling far more than we assume.

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