Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Only humans shed emotional tears.
331
Babies crawl an average of 200m a day.
212
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Yawns are more contagious among people with closer relationships.
163