It's the stuff of science fiction: robots that can hunt down and kill humans, powerful lasers that can destroy targets without leaving a trace, and a weapon that can supposedly knock you down without even touching you - all of these, and more, came one step closer to reality in 2008.
The developers of these technologies say that they will help to ensure that modern warfare is as efficient and humane as possible. Their critics say the weapons are just the latest in a long line of lethal inventions that have increased man's brutality to man - successors to the Maxim automatic machine gun, the flame thrower, and mustard gas. Whichever view you take, they introduce new ethical and practical questions.
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