>Biological weapons are used to intentionally disseminate infectious agents or toxins that would otherwise appear only naturally or not at all. Such agents can be divided into bacteria, viruses, rickettsiae, fungi or toxins... Read More on Biological Defense
Chemical weapons use the toxic rather than the explosive properties of chemical substances to produce physical or physiological effects on an enemy. Classic chemical weapons, such as chlorine and phosgene, were employed during World War I... Read More on Chemical Defense< http://www.pharmathene.com/