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George V & Kids 1921GEORGE V & family from left: Edward, Prince of Wales (Edward VIII), Princess Mary, Henry, Duke of Gloucester, George V, Albert, Duke of York (George VI), Queen Mary
Magdeburg HemispheresIn 1650 Otto von Guericke demonstrated that even a team of horses could not tug apart his hermetically sealed hemispheres from which the air had been evacuated
Diy HeliographA simple heliograph is easily constructed, and uses the suns rays to transmit messages, in morse code, over distances up to 100 kilometres
Robot character from a play by Karel CapekOne of the cast from Karel Capeks science fiction play of 1921, R.U.R. (Rossums Universal Robots). Capek was a Czech writer who made the word robot popular