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      5. Chlorine gas

      Chlorine gas
      It was perhaps inevitable that as science advanced, its discoveries would be turned to military purposes. During World War I, the Nobel-prize winning scientist Fritz Haber helped develop the first chemical weapon, chlorine gas. This led to rapid development of other weaponized chemicals, such as mustard gas and phosgene. The devastating effect of such weapons led to them being outlawed by the Geneva Convention. They did, however, lead to the development of other equally devastating weapons, such as nerve agents. While as yet they have been used relatively infrequently, the fear of such weapons being used is as prevalent as it was in the trenches.