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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The horizontal fraction bar was introduced by the Arabs.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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