The human body contains over a billion miles of DNA.
147
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
A person can live without food for about a month, but only about a week without water.
156
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
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
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346