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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.