A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
If the human eye was a digital camera, it would have 576 megapixels.
25
The human sigh acts as a physiological reset button.
23
There are about 255 babies born worldwide every minute.
46
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22