The human brain is more active during sleep than during the day.
28
Human hair and fingernails continue to grow after death.
7
You can't tickle yourself.
29
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
Pain occurs when sounds are above 130 db.
123
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Only humans shed emotional tears.
331