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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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The horizontal fraction bar was introduced by the Arabs.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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