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
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
The average person's skin weighs twice as much as their brain.
131
You see your nose at all times, your brain just chooses to ignore it.
30
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13