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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.