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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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There are more sensory neurons in the tongue than in any other part of the body.