Preview: Going to Extremes

|"Birdmen" who soar off cliffs in wingsuits; wildlife filmmakers who use "spy-cams" to show polar bears up close; and, researchers who get in the water with man-eating Nile crocodiles. They're all on "60 Minutes Presents: Going to Extremes," Sunday, Dec. 29 at 7:30 p.m. ET and 7 p.m. PT.

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