Early American humans hunted car-size armadillos and used their shells for houses.
12
By weight, Bone is five times stronger than steel.
417
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
A man's beard grows fastest when he anticipates sex.
239
The average person's skin weighs twice as much as their brain.
131
The average sperm cell swims at 8 inches per hour.
4