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The horizontal fraction bar was introduced by the Arabs.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.