If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
On average, there's 100 billion neurons in the human brain.
83
By weight, Bone is five times stronger than steel.
417
Our Right Lungs takes more air than our left lung.
194
A human being loses an average of 40 to 100 strands of hair a day.
133
Tigers can see 6 times better at night than humans.
305
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24