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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The human body produces and destroys 15 million blood cells every second.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.