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There are 60,000 miles of blood vessels in every adult human.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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People about to have surgery must tell their health care providers about all supplements they take.

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

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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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