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Did you know?
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.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.