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photocell

n.
1.a transducer used to detect and measure light and other radiations

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    Idiom of the Day

    come out ahead
    to improve one's situation
    Although our new car was expensive, we came out ahead because it is very cheap to operate.



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    I think she's the ________

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    Invention : air conditioning
    Year : 1902
    Inventor : willis haviland carrier
    Country : us.      .. More >>
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