That just doesn&#x27;t feel very realistic to me. Weapons like that don&#x27;t just appear out of nowhere. I imagine countermeasures could be developed at roughly the same pace as nanobot threats. And if not, we&#x27;ll deal with it the same way we dealt with nukes. Hopefully it would go a little better this time, since we have a little apocalyptic experience to learn from.<p>And why is this limited to nanobots? Wouldn&#x27;t it be easier to develop a million variations of existing biological viruses, rather than creating a million &quot;species&quot; of nanobots from scratch?