The human brain doesn't stop developing until about 25 years old.
102
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
One human hair can support 3 ounces.
191
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
A human being loses an average of 40 to 100 strands of hair a day.
133
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198