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AP PHOTOS: Science in silence in Radio Quiet Zone
In this Nov. 13, 2013 photo, a phone booth stands on the side of a road in Head Waters, Va., inside the National Radio Quiet Zone. While pay phones have all but disappeared in the United States, they still can be found in this part of the country, where a cell phone signal is hard to come by. The quiet zone, which has been in place since 1958, aims to protect sensitive telescopes at the National Radio Astronomy Observatory, as well as a nearby Naval research facility, from interference created by cell phones and other everyday devices that emit electromagnetic waves. (AP Photo/Patrick Semansky)

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