It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The average person's skin weighs twice as much as their brain.
131
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
On average, there's 100 billion neurons in the human brain.
83
Every human spent about half an hour as a single cell.
144
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15