They are silent, invisible killers, capable of suddenly wreaking havoc on the battlefield, or even being launched to decimate far off civilian population centres. Buildings are left untouched, but death hangs in the air. Synthetically manufactured chemical weapons like sarin and naturally occurring diseases like smallpox are inexpensive to manufacture and easy to spread. When they’re released into the air by planes or packed into artillery shells or long-range missiles they are capable of mass destruction
