All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
One human hair can support 3 ounces.
191
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
Your heart will pump about 212 million liters in its lifetime.
26
In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
22