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
You can't tickle yourself.
29
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Your fingernails grow faster in summer.
744
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
In one day, adult lungs move about 10,000 litres of air.
11