Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
23
Ian McKellen and Patrick Stewart had no idea how to play chess when they appeared in X-Men 2.
54
Our brains have a negativity bias and will remember bad memories more than good ones.
15
The first female self-made millionaire in America was a black woman.
5