I think the Neutron Bomb is still buried and unexploded somewhere. It was leaking radiation and wasn't there some kind of sickness on the island?
Besides, it's too handy a plot device to let go. Perhaps it will, you know... help the series end with a bang.
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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