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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.