Yawns are more contagious among people with closer relationships.
163
The average person's skin weighs twice as much as their brain.
131
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
94
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
In one day, adult lungs move about 10,000 litres of air.
11
There are about 255 babies born worldwide every minute.
46
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
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24