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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.