When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
If the human eye was a digital camera, it would have 576 megapixels.
25
Yawns are more contagious among people with closer relationships.
163
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
Our brains have a negativity bias and will remember bad memories more than good ones.
15