A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
On average, there's 100 billion neurons in the human brain.
83
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
By weight, Bone is five times stronger than steel.
417
Early American humans hunted car-size armadillos and used their shells for houses.
12
Our brains have a negativity bias and will remember bad memories more than good ones.
15
The human brain doesn't stop developing until about 25 years old.
102