Early American humans hunted car-size armadillos and used their shells for houses.
12
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Our brains have a negativity bias and will remember bad memories more than good ones.
15
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The human body contains over a billion miles of DNA.
147