Pain occurs when sounds are above 130 db.
124
Only humans shed emotional tears.
331
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
The human brain is more active during sleep than during the day.
28
Tigers can see 6 times better at night than humans.
305