One hundred years ago, French troops fired tear gas grenades into German trenches. Designed to force people out from behind barricades and trenches, tear gas ca

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Does the identification number 60 indicate a toxic substance or a flammable solid, in the molten state at an elevated temperature? Does the identification numbe

The story of how a chemical weapon went from the battlefield to the streets More than a hundred years ago, French troops fired the first tear gas grenades at th