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In page Squash (sport):

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Squash has its origins in the older game of rackets, which was played in London's prisons in the 19th century. Later, around 1830, boys at Harrow School noticed that a punctured ball, which "squashed" on impact with the wall, offered more variety to the game. The game spread to other schools. The first courts built at Harrow were dangerous because they were near water pipes, buttresses, chimneys, and ledges.[citation needed] Natural rubber was the preferred material for the ball. Students modified their rackets to have a smaller reach and improve their ability to play in these cramped conditions.[1] In 1864, the school built four outside courts.[2]