A Brief History of Nerve Agents

A brief history of Nerve Agents/gas as everyone is talking about them in the news at the moment.
Nerve agents were first discovered in Nazi Germany known as the G agents, Tabun, Sarin and Soman, all were organophosphate pesticides that were too deadly for agricultural use, nerve agents are inhaled or penetrate the skin where they interfere with the bodies ability to control nerve controls such as heart rate and breathing.
In the 1950s Britain and the Soviet Union developed the V series of nerve agents, again from pesticides the most deadly being VX in which a single gram could potentially kill over one hundred people.
Now the Novichok series of nerve agents is in the news which may or may not exist, supposedly developed to be even deadlier than the V series of nerve agents and easier to manufacture.

Nerve agents are a weapon of mass destruction, equal in many ways to a nuclear warhead, they are banned and seen as a red line that should not be crossed but many nations still own massive stockpiles of them.