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Like many other insects, caterpillars follow scent trails left by their fellows. Paint the ground with an invisible circle of scent molecule and put a few caterpillars down on it. Like locomotives on a circular track, they'll go around and around forever--or at least until they drop from exhaustion. What, if anything, is the the caterpillar thinking? "The guy in front of me seems to know where he's going, so I'll follow him to the ends of the Earth"? ...we detect a simple algorithm and no hint of an executive intelligence evaluating discordant data.
- Carl Sagan Shadows of Forgotten Ancestors p. 163
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