Nano Apocalypse

There are many ways in which humanity could become extinct before reaching posthumanity. Perhaps the most natural interpretation of is that we are likely to go extinct as a result of the development of some powerful but dangerous technology like molecular nanotechnology, which in its mature stage would enable the construction of self‐replicating nanobots capable of feeding on dirt and organic matter, a kind of mechanical bacteria. Such nanobots, designed for malicious ends, could cause the extinction of all life on our planet. (Are you living in a computer simulation? by Nick Bostrom

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