After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Early American humans hunted car-size armadillos and used their shells for houses.
12
Tigers can see 6 times better at night than humans.
305
A person can live without food for about a month, but only about a week without water.
156
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
One human hair can support 3 ounces.
191