Fabulous flippers: Dolphins have quite the kick

(AP) -- Dolphins have a kick that would make Michael Phelps jealous - 212 pounds worth. How dolphins are able to swim so fast first preoccupied researchers back in 1936, when zoologist James Gray calculated the drag dolphins must overcome to swim faster than 20 miles an hour. Gray said dolphins lacked the muscles to swim so fast, and yet they did. This became known as Gray's Paradox.

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