If your DNA was stretched out it would reach to the moon 6,000 times.
256
Pain occurs when sounds are above 130 db.
124
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Enamel is hardest substance in the human body.
61
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
A human being loses an average of 40 to 100 strands of hair a day.
133
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15