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Nearly 17 million Americans have acne, making it the most common skin disease in this country, according to the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Test your knowledge of acne by taking this multiple-choice quiz.
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Test your knowledge of what it takes to be a healthy teen.
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Sometimes it's hard to keep your vitamin facts straight. How much vitamin A do you need? What's the best source of Vitamin C? And all those B vitamins--which one is which?
Here's a quiz that offers a chance to learn something different, but not necessarily trivial, about vitamins.
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