Early American humans hunted car-size armadillos and used their shells for houses.
12
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The average sperm cell swims at 8 inches per hour.
4
Mushrooms are more closely related to humans than they are to plants.
47
It takes approximately 12 hours for food to entirely digest.
93
A person can live without food for about a month, but only about a week without water.
156
Poor eyesight (myopia) is associated with higher IQ.
232