You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
59
There are about 1,400 different species of bacteria in your belly button.
10
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The human sigh acts as a physiological reset button.
23
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
The average sperm cell swims at 8 inches per hour.
76