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Scientists have discovered the Caribbean Sea works like a whistle. This finding will enable scientists to predict some sea level changes many months in advance, and may be an important factor in regulating how the Gulf Stream varies. This research has found the Caribbean Current flow is unstable, which causes it to shed eddies, or swirling currents of water hundreds of kilometers in diameter. This is similar to the way in which a jet of air sheds eddies when it hits the lip of a whistle.
(via WSJ Blogs)