The human eye blinks an average of 4,200,000 times a year.
233
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Human hair and fingernails continue to grow after death.
7
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Early American humans hunted car-size armadillos and used their shells for houses.
12
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266