It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
We share 70% of our DNA with a slug.
218
The human brain is more active during sleep than during the day.
28
The average person will go on a date at least 100 times before they finally marry.
33
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Every human spent about half an hour as a single cell.
144
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31