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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
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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.