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Roger Hanlon is one of the world’s foremost experts on one of the planet’s most amazing creatures: the octopus. For decades, he has undertaken expeditions around the globe to study these intelligent creatures. Now, Hanlon and engineer and oceanographer Derya Akkaynak are on the homestretch of an eight-year odyssey to find out whether cephalopod camouflage is really as effective as we think—and they’ve got just the tool to do it.

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