1. Discovery of insecticide DDT. P. Müller receives the Nobel Prize in 1948. DDT has been banned in Germany since 1972.

  2. Otto Hahn and Fritz Straßmann discover nuclear fission.

  3. The first patent for production of synthetic fibres is granted. Under the Nazi policy of self-sufficiency, the industry expands greatly in the 1930s.

  4. A "fog disaster" in Maastal near Lüttich claims 100 lives.