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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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