X-rays of the Mona Lisa show that there are three completely different versions of the same subject, all painted by Leonardo Da Vinci, under the final portrait.
Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this. (That’s why mothers always have a nappy or cloth on their shoulders…)
An eagle can attack, kill, and carry away an animal as large as a small deer.
The human brain is insensitive to pain.