When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
A human being loses an average of 40 to 100 strands of hair a day.
133
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
Our brains have a negativity bias and will remember bad memories more than good ones.
15
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
The human body contains over a billion miles of DNA.
147
You can't tickle yourself.
29