children books

Where was the Helicopter Invented?

The helicopter is the only aircraft that can move forward, backward, side-to-side and hover. The VS-300 was the world’s first practical helicopter that took flight at Stratford, Connecticut, on September 14, 1939. The first helicopter was designed by Igor Sikorsky and built by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation. It took 29

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Where was the First Refrigerator Invented?

The process of the Invention of the refrigerator started in the 18th century. In 1748, William Cullen of the University of Glasgow developed a process for creating an artificial cooling medium. An American inventor Oliver Evans designed the first refrigerator in 1804. In 1843, Jacob Perkins built the first refrigeration machine in Great Britain. In

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