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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.