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An octopus has nine brains and three hearts. It has one central brain plus eight additional brains inside each tentacle.

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Octopuses don't have tentacles, they have eight arms. Arms are more versatile than tentacles and can perform much finer movements.

The Pacific Ocean is the biggest ocean in the world, accounting for 32% of the world's total surface area. That's slightly more than all the land in the world combined.

The ocean sunfish can lay up to 300 million eggs at a time. Being the heaviest bony fish in the world, their weight may reach 2,200lbs (1,000kg).

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The biggest garbage patch in the world is found in the Pacific Ocean. It's made up of tiny plastic particles which can't be seen, but pose danger to all marine life. By preventing reflecting sunlight the plastic starves the algae and plankton living below.

About 10% of plastic made every year ends up being dumped into the ocean.

About 10% of plastic made every year ends up being dumped into the ocean.

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