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.
22
Your heart will pump about 212 million liters in its lifetime.
26
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
The average person's skin weighs twice as much as their brain.
131
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
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
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human sigh acts as a physiological reset button.
23