Nanomachines
The main issue with nanomachines, is that they're able to improve themselves. Once created, they'd need just under 3 days to dominate Earth. This time frame is only due to the incompetencies of humans limiting their rate of improvement.
The main issue with nanomachines, is that they're able to improve themselves. Once created, they'd need just under 3 days to dominate Earth. This time frame is only due to the incompetencies of humans limiting their rate of improvement.