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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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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.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.