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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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The average office desk has 400 times more bacteria on it than a toilet.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.