Factopus

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LESSON 4 · Life in the Deep

PAUSE TO THINK

Where do most of an octopus's nerve cells live?

In its arms, not its head.

About two-thirds of an octopus's nerve cells sit in the eight arms rather than the central brain. This is why an arm can explore and grab on its own, and why a detached arm keeps reacting for a while after it is separated.

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