Thousands of bright blue animals are washing ashore–what are they?

Over the past few months, odd floating jellies have been washing up on Pacific US beaches by the thousands. With clear plastic-like sails, and bright blue flesh, these harmless jellies have stumped many a beachcomber. Now, Steve Haddock and Susan von Thun of the Monterey Bay Aquarium Research Institute have put together a video explaining exactly what these creatures are, and their bizarre upside-down world:

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