A man's beard grows fastest when he anticipates sex.
239
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Yawns are more contagious among people with closer relationships.
163
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
One human hair can support 3 ounces.
191
The human brain is more active during sleep than during the day.
28
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93