Gorillas can catch human colds and other illnesses.
205
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
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
Yawns are more contagious among people with closer relationships.
163