After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
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
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human sigh acts as a physiological reset button.
23
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118