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A new(ish) and alternative form of greeting and showing respect has been to more hygienic than shaking hands. We have all it on TV. Basketball and baseball players it after a teammate scores. Rock stars and actors it onstage at awards ceremonies. Even U.S. President Barack Obama does it. What is it? Well, it's fist bumping. It's kind of like a high five, except the hand is into a ball and the other person's fist is a gentle nudge, knuckles to knuckles. Researchers at the University of Aberystwyth in Wales have that this twenty-first-century greeting one-twentieth of the germs than a traditional handshake and around one tenth of the germs in a high five.

An article on Wikipedia that the fist bump with American motorcycle gangs in the 1940s. It was easier and safer to bump another rider than to hands when two bikes were side by side at traffic lights. It global exposure 70 years later when in 2008, President Obama and his wife Michelle fist bumped during a televised presidential campaign speech. There is less skin-to-skin contact during a fist bump so the chance of spreading germs lower. A researcher said: "People rarely about the health implications of shaking hands, but if the general public could encouraged to fist bump, there a genuine potential to the spread of infectious diseases.