Only humans shed emotional tears.
331
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Your fingernails grow faster in summer.
744
Gorillas can catch human colds and other illnesses.
205
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
It takes about 20 seconds for a red blood cell to circle the whole body.
102
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127