Early American humans hunted car-size armadillos and used their shells for houses.
12
Your fingernails grow faster in summer.
744
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
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
On average, there's 100 billion neurons in the human brain.
83
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
