This article was originally published with the title “ Leonhard Euler and the Koenigsberg Bridges ” in Scientific American Magazine Vol. 189 No. 1 (July 1953), p. 66 doi:10.1038 ...

The walk is also the solution to a mathematical puzzle called the 'Königsberg Bridge Problem' - how to walk around a given set of bridges crossing each one only once. The problem has been solved ...