When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
The human brain uses approximately as much energy as a 10 watt light bulb.
120
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
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Enamel is hardest substance in the human body.
61
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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