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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.