The adult human brain weighs about 3 pounds (1,300-1,400 g).
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It takes about 20 seconds for a red blood cell to circle the whole body.
102
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
You can't tickle yourself.
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The average person will go on a date at least 100 times before they finally marry.
33
Every human spent about half an hour as a single cell.
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The average sperm cell swims at 8 inches per hour.
4
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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