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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The horizontal fraction bar was introduced by the Arabs.
The familiar sounds of your heart are made by the heart's valves as they open and close.
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