On Chicago's Roof

09/18/2012 05:49 pm ET | Updated Nov 18, 2012

Changing a lightbulb in your own place is one thing. Try doing it 1,500 feet in the sky while standing on the roof of the tallest building in North America with only your own balance and wits keeping you on solid ground.

It's all in a day's work for Willis Tower electricians John Barker and Mike Hlavacek.

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