We all know that dolphins are intelligent.  This is just another example
of how playful these mammals can be.  They look like they're having
fun in this video posted by CNN on November 27, 2010.

I tend to agree with the scientists out there--I believe dolphins and whales are quite intelligent.  If you want to explore this idea in a science fiction way, check out Startide Rising by David Brin.  Excellent book.

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