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The horizontal fraction bar was introduced by the Arabs.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.