Interview with Hans Moravec

The story for intelligence is even clearer. Small-scale controlled fusion is not observed in nature, so for all we know it might be astronomically difficult or impossible. Each of us, however, is direct evidence that intelligence can arise in a few Kilos of matter powered by a few Calories of energy, in about a billion small evolutionary steps. Technological evolution is roughly retracing biology's journey. Fifty years ago our most complex machines were behaviorally simpler than bacteria.