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Entering the Danger Zone: In March 2011, a series of meltdowns and explosions turned the Fukushima Daiichi nuclear power station into a radioactive ruin. The damaged reactor buildings are far too radioactive for humans to safely work in, so robots are surveying radiation levels and starting the cleanup. The PackBot, an inspection bot from iRobot of Bedford, Mass., was one of the first bots to arrive at the site.