This chemical was one of the most popular insecticides of all time. For a number of years it was put on crops to kill bugs and keep them away. It was not until later that people have found this chemical to be toxic. DDT was invented by Othmar Zeilder. Othmar was a German chemist that put this combination together. Later Paul Hermann Muller from Switzerland found that this mixture of chemicals was effective at killing bugs. While the combination was invented in Germany this man from Sweden got the Nobel Prize for it.