Nuclear weapons are the hardest to make and the one the has the most destructive capabilities. And finally, biological are a real treat, because they can either be as easy to make as chemical weapons and have the destructive force of nuclear weapon. .
Chemical weapons are attractive to many countries, because it is easy to manufacture and it is relatively cheap to make. They can be different in "mode (how it enters your body). in the lethality of the dose, speed of action (period between exposure and observed effects), persistency, (the amount of time the agent remains dangerous in the atmosphere once released) and state (solid, liquid, or gas)" . To get a better understanding of the lethality of the dosage for the different types of chemical weapons "about 3000 milligrams of the choking agent phosgene per cubic meter of air will kill 50% of all the people exposed. Only 70 milligrams of the nerve agent sarin, is needed to generate the same fatality rate. And at the other extreme only 10 milligrams of the nerve agent VX are needed to kill the average adult" . The four most feared chemical weapons in the world today are sarin gas, VX, mustard gas, and lewisite. Sarin gas is a nerve agent, which means that once it is inside your body it interrupts the process of communication between nerve cells. This is probably one of the most feared chemical agents in the world because in 1995 the group Aum Shinrikyo released sarin gas in a Tokyo subway. Wounding thousands and killing twelve people. Both Mustard Gas and Lewisite are blistering agents, which means that they burn the skin and burn the lung tissue upon contact. The last feared chemical agent is VX gas. VX gas was "developed at the Porton Down Chemical Weapons Research Center in Wiltshire, England around 1952. Eventually the British traded the technology of VX gas to the United States of America for information on thermonuclear weapons" .
