The human brain doesn't stop developing until about 25 years old.
102
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Early American humans hunted car-size armadillos and used their shells for houses.
12
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
By weight, Bone is five times stronger than steel.
417
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
In one day, adult lungs move about 10,000 litres of air.
11