When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The average sperm cell swims at 8 inches per hour.
4
You can't tickle yourself.
29
If the human eye was a digital camera, it would have 576 megapixels.
25
A human being loses an average of 40 to 100 strands of hair a day.
133
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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