Who invented the first practical helicopter and when?

Prof. Henrich Focke, a German inventor, devised the first practical helicopter called the Focke-Wulf Fw 16, which was successfully flown in 1936.  By 1938 it set many world records for altitude, speed and flight duration. It could be flown by a pilot after only one hour of pilot briefing.

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How the great scientist J.C. Bose fought discrimination and won

Jagadish Chandra Bose as a professor of Physics at Presidency College, Kolkata, was offered a salary substantially lower than his European colleagues, many of whom were less qualified than him. Prof. Bose was then under the Imperial Education Service (IES). He refused to accept it but nevertheless left no stone unturned in discharging his duties. After three long years, the IES relented and placed him at par with the European professors. This incident played a significant role in instilling in him an everlasting sense of nationalistic fervour and zeal.

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