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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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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.