Nuclear weapons and other WMD are the deadliest weapons on earth. But what do you really know about them?
Chemical weapons, such as nerve gas and tear gas, have been formulated to inflict harm or death to humans. They can be widely dispersed in gas, liquid and solid forms. Biological weapons are made of living organisms that spread disease among humans, animals or plants. They are far more deadly than chemical weapons – just a small amount could do as much damage as a chemical weapon a thousand times bigger.