In most people’s sci-fi nightmares about robots trying to wipe out humanity, the robots tend to be big. But wouldn’t they be more deadly if they were tiny? 0.2-0.5 millimeters is bigger than bacteria or viruses, but it’s the size range of many single-cell protozoans.
That possibility is bad enough, but we’d better hope no one figures out how to make these things self-replicating. Think that sounds far-fetched? Evolution figured it out with single-cell organisms 2 billion years ago, and they haven’t faltered since.


I wasn’t thinking about the little robots figuring it out. I was thinking of humans designing it, and releasing it (perhaps accidentally).
And look at the havoc that relatively simple but communal organisms can wreak (ants),
Then there are bacteria, viruses, and other single-celled organisms.
All one would need to do is replicate itself and produce a toxin.
But then that’s not evolution?