Find the G.C.F. & L.C.M. of 20 and 28.
Which scientist discovered the radioactive element radium?
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What George Westinghouse invented?
Who invented the BALLPOINT PEN?
It travels over land and water. Who invented the HOVERCRAFT?
In which decade was the Internet first implemented?
Who is the inventor of railway engine?
Who Invented Modern Frequency Modulation FM Radio ?
Who Invented Microwave Oven ?
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