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CCC comments on 2013 Survey Results - Less Wrong
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I'll have to disagree here. Evolution operating over aeons never got to jet engines and nuclear weapons. Maybe it needs more time?
Evolution has got as far as basic jet engines; see the octopus for an example.
Interestingly, this page provides some interesting data; it seems that a squid's jet is significantly less energy-efficient than a fish's tail for propulsion. This implies that that's perhaps why we see so little jet propulsion in the oceans...