The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Gorillas can catch human colds and other illnesses.
205
The human eye blinks an average of 4,200,000 times a year.
233
The average sperm cell swims at 8 inches per hour.
4
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Early American humans hunted car-size armadillos and used their shells for houses.
12