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 person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Every human spent about half an hour as a single cell.
144
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Poor eyesight (myopia) is associated with higher IQ.
232
Only humans shed emotional tears.
331
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22