The radioactive substance, Americanium - 241 is used in many smoke detectors.

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Uranus' orbital axis is tilted at 90 degrees.
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Western Electric successfully brought sound to motion pictures and introduced systems of mobile communications which culminated in the cellular telephone.
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Ethernet is a registered trademark of Xerox, Unix is a registered trademark of AT&T.
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Bill Gates' first business was Traff-O-Data, a company that created machines which recorded the number of cars passing a given point on a road.
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On December 23, 1947, Bell Telephone Laboratories in Murray Hill, N.J., held a secret demonstration of the transistor which marked the foundation of modern electronics.
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Plutonium - first weighed on August 20th, 1942, by University of Chicago scientists Glenn Seaborg and his colleagues - was the first man-made element.
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A chip of silicon a quarter-inch square has the capacity of the original 1949 ENIAC computer, which occupied a city block.
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On average, half of all false teeth have some form of radioactivity.

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