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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.