When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
If your DNA was stretched out it would reach to the moon 6,000 times.
256
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
A person can live without food for about a month, but only about a week without water.
156
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human brain doesn't stop developing until about 25 years old.
102