Yawns are more contagious among people with closer relationships.
163
Early American humans hunted car-size armadillos and used their shells for houses.
12
By weight, Bone is five times stronger than steel.
417
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Human hair and fingernails continue to grow after death.
7
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