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
A person can live without food for about a month, but only about a week without water.
156
The human sigh acts as a physiological reset button.
23
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
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 glasses which allow a red-green color-blind person to see colors the way everyone else does.
22