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T cells use 'handshakes' to sort friends from foes

T cells, the security guards of the immune system, use a kind of mechanical "handshake" to test whether a cell they encounter is a friend or foe, according to a new study that may help develop immune therapies for cancer.

Fist bumps more hygienic than handshakes

Fist bumps may be a more hygienic greeting than shaking hands, according to a new study which found that germ transfer was 90 per cent lower when bumping fists than during a handshake.

Wave to say hello as handshake may carry microbes

A study has asked for the popular handshake to be replaced by a new gesture as the practice is an dangerous as smoking in public - especially in hospitals.