Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
The human brain has the capacity to store everything that you experience.
4k
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
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