Murder by nanotechnology

[Loren Booda]

Might it be possible?

Speculation: a fly-sized robot injects a polonium into an unsuspecting victim.

How can we defend against such attacks? What other fronts must we protect from nanotechnology - a replicating mechanical virus?

[makethings]

Those are some far fetched ideas for weapons.. maybe it would be one day possible so as for defense I'm sure it would be possible to come up with a safe field generator that produces EM fields that would specifically disable such devices.

Or the "good side" of your ideas are you can have friendly nano-mechanical anti-bodies that would fight off viruses and chemical/radiation attacks.