It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Your heart will pump about 212 million liters in its lifetime.
26
Mushrooms are more closely related to humans than they are to plants.
47
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
The human brain has the capacity to store everything that you experience.
4k
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
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