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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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In 1864, the first barbiturate (barbituric acid) was synthesized.