Tigers can see 6 times better at night than humans.
305
Only humans shed emotional tears.
331
A man's beard grows fastest when he anticipates sex.
239
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
A human being loses an average of 40 to 100 strands of hair a day.
133
The average sperm cell swims at 8 inches per hour.
4
The human eye blinks an average of 4,200,000 times a year.
233