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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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There are 60,000 miles of blood vessels in every adult human.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.