Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The average sperm cell swims at 8 inches per hour.
4
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Yawns are more contagious among people with closer relationships.
163
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
It takes approximately 12 hours for food to entirely digest.
93
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92