Chemical warfare is war fought with chemicals. The development of chemical weapons and defenses against these weapons are usually considered together in military training. These weapons can be designed to kill large numbers of people, disable them for a while, or destroy their food supplies. The weapons are usually effective without destroying property. Chemical agents affect the nervous system, breathing centers, skin, eyes, nose, or throat. They include gases, liquids, sprays, and powders. They can even be sprayed by airplanes, dropped as bombs, fired by artillery in explosive shells, or scattered by exploding land mines. Some chemical agents, called nerve agents can even caus