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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.