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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.