Only humans shed emotional tears.
331
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
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
Every human spent about half an hour as a single cell.
144
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human sigh acts as a physiological reset button.
23