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Gregory Karp

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Generally, a wood-burning fireplace is an inefficient way of heating your home.  Most of the heat goes out the chimney.
Travelers line up to check in at American Airlines at O'Hare International Airport on Wednesday, Nov. 27, 2013.
Terrain, trees and buildings can affect signals and the type of antenna that works best at your location.
A United Airlines plane taxis toward a runway at O'Hare International Airport in Chicago, Friday, May 16, 2014.