Before revision: 19th Century Year Event Reference1839Eduard Simon, a German apothecary, discovers polystyrene 1844 Thomas Hancock patents the vulcanization of rubber in Britain immediately followed by Charles Goodyear in United States.
After revision: Mario bros Year Event Reference1839Eduard Simon, a German apothecary, discovers polystyrene 1844 Thomas Hancock patents the vulcanization of rubber in Britain immediately followed by Charles Goodyear in United States.