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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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