A person can live without food for about a month, but only about a week without water.
156
It takes about 20 seconds for a red blood cell to circle the whole body.
102
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
All 13 minerals necessary for human life can be found in alcohol beverages.
282
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The human eye blinks an average of 4,200,000 times a year.
233
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Only humans shed emotional tears.
331