The world's shortest man measures only 21.5 inches.
73
Early American humans hunted car-size armadillos and used their shells for houses.
12
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11