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radiothorium

n.
1.radioactive isotope of thorium with mass number 228

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  • Idiom of the Day

    make a laughingstock of (someone)
    to do something that makes people laugh at someone
    I made a laughingstock of myself when I dropped the plate of crackers at the party.



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    Invention
    Invention : photocopying (xerography)
    Year : 1937
    Inventor : chester f. carlson
    Country : us.      .. More >>
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