I Really Wouldn't Worry About Nanobots

Nanarobots come up all the time in syphy. And supposedly these ones could tay cold, target certain pe will deaney and attack them specifically,. ad then pass them on between people by touchhow close is that to actually what is possible? I'm guessing people really shouldn't be worried about nanobots in this sense. Er, nano technology is brilliant. It's just very, very small scale. The smaller you get, the more difficult it is to get functioning objects - especially something as complicated as a killer robot.