In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
It takes about 20 seconds for a red blood cell to circle the whole body.
102
The human brain doesn't stop developing until about 25 years old.
102
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
We share 70% of our DNA with a slug.
218
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13