After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
Enamel is hardest substance in the human body.
61
On average, there's 100 billion neurons in the human brain.
83
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The human eye blinks an average of 4,200,000 times a year.
233