Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
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
Sound travels about 4 times faster in water than in air.
408
Vicks inhalers can cause you to test positive for Meth on drug tests.
41
A man earned 4 million airline miles for free without breaking any laws by using his credit card to purchase free-delivery $1 coins from the U.S. mint.
11
Your body is creating and killing about 2.4 million red blood cells per second.
17
