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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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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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Asthma cases in Americans are about 75% higher today than they were in 1980.

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There are more sensory neurons in the tongue than in any other part of the body.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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