The secret of 'Achilles heel'

'Achilles heel' is often mentioned when referring to a human weakness, however, scientists at the University of Arizona (USA) have just proven that it is 'Achilles Heel' that modern people has survived to this day while the Neanderthals - the closest evolutionary relative to humans - are extinct.

The group of researchers led by Professor David Raichlen measured the length of the heel tendons of volunteers and found that those with shorter heel ligaments would consume less energy in each step and they Can run faster, more durable.

Compared to the skeleton of the Neanderthals, scientists see that Neanderthals have heel bones that are always longer than our ancestors and this causes them to lose in the race to rich, rich lands. food and extinct about 38,000 years ago.