Reply #4: Nanos

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I believe you're thinking of sci fi. All I know is that in the Uglies, by Scott Westerfeld, more than 90% of the human population is wiped out by oil eating nanos. As it turns out, we were trying to clean up an oil spill with this new technology, when it got out of hand, and went after anything made out of oil. Which included cars, clothing, makeup, etc. Everything basically became a bomb.