Arms That Can Think and Taste

An octopus has around 500 million nerve cells, a similar number to a dog.

But most of them aren't in its head. Roughly two-thirds are in its arms.

That means each arm can sense, react and even make simple decisions on its own, while the brain sets the overall plan.

The suckers are packed with sensors that can feel and taste at the same time. An octopus can taste its food simply by touching it.

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