The human sigh acts as a physiological reset button.
23
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
On average a woman has 4 sexual partners in her lifetime.
-143
Our Right Lungs takes more air than our left lung.
194
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89