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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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People about to have surgery must tell their health care providers about all supplements they take.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.