The adult human brain weighs about 3 pounds (1,300-1,400 g).
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On average, there's 100 billion neurons in the human brain.
83
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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A human being loses an average of 40 to 100 strands of hair a day.
133
The world's shortest man measures only 21.5 inches.
73
The average person's skin weighs twice as much as their brain.
131
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