An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Only humans shed emotional tears.
331
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
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