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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 60,000 miles of blood vessels in every adult human.
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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.