The human eye blinks an average of 4,200,000 times a year.
233
Tigers can see 6 times better at night than humans.
305
Our brains have a negativity bias and will remember bad memories more than good ones.
15
By weight, Bone is five times stronger than steel.
417
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The average person's skin weighs twice as much as their brain.
131
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13