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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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Thyroid conditions may make getting pregnant impossible.
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The human body produces and destroys 15 million blood cells every second.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.