What is a nerve agent and was one used to poison Russian spy Sergei Skripal ...
(World News UK)

NERVE agents are some of the most toxic substances unknown - even tiny doses can prove lethal. But how do the likes of VX and sarin work, and what are their devastating effects? Here's what you need to knowand the advice given out to those who might be affected. AP What is a nerve agent and how do they work? Nerve agents are a class of chemicals called organophosphates - meaning they contain phosphorous - that are extremely poisonous. They attack the nervous system of the human body, which passes messages from the brain to other parts of the body, telling it what to do. In order for those chemical messages to reach different parts of the body, they jump from one nerve to another. Nerve...