The Octopus: Stable Genius

Does an octopus have a brain? Where is it? And just how smart is an octopus? A. In a sense, an octopus has several brains, collections of neurons that control each arm. A famous 2001 study in the journal Science described how the commands that control one arm’s movement continue even when connections to the walnut-sized central processing system in the head are severed.

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