The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Early American humans hunted car-size armadillos and used their shells for houses.
12
On average a woman has 4 sexual partners in her lifetime.
-143
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
The average person's skin weighs twice as much as their brain.
131
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Our Right Lungs takes more air than our left lung.
194