It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Your body is creating and killing about 2.4 million red blood cells per second.
17
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
A person can live without food for about a month, but only about a week without water.
156
Your thumb is about the same size as your nose.
124
The human brain doesn't stop developing until about 25 years old.
102
