The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Human hair and fingernails continue to grow after death.
7
Only humans shed emotional tears.
331
Your fingernails grow faster in summer.
744
One human hair can support 3 ounces.
191
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Gorillas can catch human colds and other illnesses.
205