The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
In one day, adult lungs move about 10,000 litres of air.
11
The average sperm cell swims at 8 inches per hour.
4
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The largest cell in the human body is the female egg and the smallest is the male sperm.
682