Tigers can see 6 times better at night than humans.
305
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139