James Cameron explains why Avatar aliens have tails

James Cameron appeared on 60 Minutes last night, where he gave Morley Safer—and us—a behind-the-scenes look at how he went from being the director of "the very best flying piranha movie ever made" to the creator of the $400 million 3-D fantasy Avatar.

"This is the film I think I always wanted to make when I set down the path of being a filmmaker," said Cameron.

He also revealed the reason he gave his blue aliens tails—because: "Tails are cool!"

Well, there's actually more to it than that. To learn the rest of the story, check out the video below.

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