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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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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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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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