Even in ancient times, war wasn't all swords and longbows. Some examples: Unrestricted use of chemical agents caused 1 million of the 26 million casualties suffered by all sides in WWI.

CS, or 2-chlorobenzylidene malononitrile, is a synthetic chemical that is white and crystalline when solid, but can also be used in liquid or gas form. It is what is known as a riot control agent ...

Clip: Sampling devices, positioned throughout the test area, yield valuable information to chemical core researchers. Narrator: The 1950s, for example ... of disease or agent, but experimenters ...