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The American inventor, Elisha Graves Otis, developed the modern, safe elevator with elevator brakes. The first elevator was driven by the steam power. It was put into a five-storey departmental store in New York City in 1857. It was used to ferry passengers.In 1891, the American scientist, J.W. Reno invented the escalator. The Otis Elevator Company was the first to install the escalators at the Paris Expositions of 1900 and in the New York City subway system. The escalator in the Ocean Park of Hong Kong is one of the longest escalators in the world. It can carry 400 people per hour.Elisha Graves OtisJ.W. RenoForty per cent of the electricity in the world is made from burning coal; its heat turns water into steam, which turns turbines(big wheels) that make the electricity.Science and technology have always been an integral part of our lives. Let us see how.32