Human teeth are almost as hard as rocks!
47
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
During menstruation, the sensitivity of a woman's middle finger is reduced.
47
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
We are born with 350 bones, and die with 206.
135