A man's beard grows fastest when he anticipates sex.
239
Only humans shed emotional tears.
331
All 13 minerals necessary for human life can be found in alcohol beverages.
282
Every human spent about half an hour as a single cell.
144
The world's shortest man measures only 21.5 inches.
73
Tigers can see 6 times better at night than humans.
305
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139