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Vaccines prevent between 2.5 and 4 million deaths every year.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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Video: What is Cholesterols? Introduction to Lipoproteins

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