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Your heart beats over 36 million times a year.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).