Only humans shed emotional tears.
331
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
The average sperm cell swims at 8 inches per hour.
4
Poor eyesight (myopia) is associated with higher IQ.
232
A human being loses an average of 40 to 100 strands of hair a day.
133