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
The human sigh acts as a physiological reset button.
23
The human brain doesn't stop developing until about 25 years old.
102
On average a woman has 4 sexual partners in her lifetime.
-143
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
It takes approximately 12 hours for food to entirely digest.
93
A man's beard grows fastest when he anticipates sex.
239
One human hair can support 3 ounces.
191