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I think that the reason why you hear less about nanobots is because nanobots are indeed still under heavy development, but also because the news is somehow less spectacular. It isn't the realisation of some scifi idea without the actual applications. People like to hear about improvements like "nanobots now deliver cancer medicine to the cancer cells". Not about "nanobots can now hit targets with greater precision". You need the latter for the first, but the latter is 'meh' while the first is 'WOW!'. I am no expert, but this is my guess.