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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
There are more nerve cells in one human brain than there are stars in the Milky Way.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
There are more sensory neurons in the tongue than in any other part of the body.
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