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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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The horizontal fraction bar was introduced by the Arabs.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.