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Who's to say we can't build biological computers, anyway? Imagine if a brain in a vat were your personal computer.

That's why I said, "taking over", rather than somehow replacing or eliminating. We already can build biological computers, but only very rudimentary ones. Like in DNA computing. When you get down to the nanoscale, the lines between biological and electromechanical machines become very blurred.

Oh, totally. Atoms are atoms.