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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.