"Years ago, anthropologist Margaret Mead was asked by a student what she considered to be the first sign of civilization in a culture.
The student expected Mead to talk about fishhooks or clay pots or grinding stones.
But no. Mead said that the first sign of civilization in an ancient culture was a femur (thighbone) that had been broken and then healed.
Mead explained that in the animal kingdom, if you break your leg, you die. You cannot run from danger, get to the river for a drink or hunt for