When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Tigers can see 6 times better at night than humans.
305
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30