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Author: luapo

What Is the Evolutionary Purpose of Tickling?

You probably know that you can’t tickle yourself. And although you might be able to tickle a total stranger, your brain also strongly discourages you from doing something so socially awkward.

These facts offer insight into tickling’s evolutionary purpose, says Robert R. Provine, a neuroscientist at the University of Maryland and the author of the book Laughter: A Scientific Investigation. Tickling, he says, is partly a mechanism for social bonding between close companions and helps forge relationships between family members and friends.

The day Niagara Falls ran dry

A view from the top of the de-watered Niagara Falls in 1969 in New York. Unearthed after 41 years by American Russ Glasson, they were taken by his mother and father in law and show when the famous waterfall was turned off for almost six months. For six months in the summer and autumn of 1969, Niagara’s American Falls were “de-watered”, when the Army Corps of Engineers conducted a survey of the falls’ rock face, concerned that it was becoming destabilized by erosion.