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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.