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The horizontal fraction bar was introduced by the Arabs.
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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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.