By now practically the whole world knows that Kim Jong-nam, North Korean dictator Kim Jong-un's older half-brother, was killed by the extremely toxic nerve agent called VX. VX is much more potent than sarin, which was used by the Aum Shinrikyo cult to kill 12 people and injure thousands of others in the Tokyo subway in 1995. Apparently, it's not clear why this series of nerve agents is called "V" ( "Victory", "Venomous", or "Viscous" are some of the possibilities). Since research on these agents is restricted primarily to the military, not much is known about them in civilian circles. Whatever the "V" stands for, and besides VX, other agents in the series include VE, VG, VM, and VR.
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