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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
Did you know?
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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.