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How Novichok nerve agents work

Novichok, the nerve agent that was used on the former former agent Serghei Skripal and his daughter, Julia, is a much stronger chemical weapon than VX, the substance used in the assassination of Kim Jong-nam, the North Korean dictator's step-brother. Unlike other known neurotoxins which are used in the form of vapor or liquid, Novichok is mostly used as an ultra-fine powder. How does this chemical weapon work? Novichok is made up of two...