By weight, Bone is five times stronger than steel.
417
Mushrooms are more closely related to humans than they are to plants.
47
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
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
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
On average a woman has 4 sexual partners in her lifetime.
-143
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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