Every human spent about half an hour as a single cell.
144
Our brains have a negativity bias and will remember bad memories more than good ones.
15
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Human hair and fingernails continue to grow after death.
7
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11