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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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The average office desk has 400 times more bacteria on it than a toilet.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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.