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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are approximately 3 million unintended pregnancies in the United States each year.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.