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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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The horizontal fraction bar was introduced by the Arabs.
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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.