Gold-colored foam wedges shield test subjects from outside noises during an acoustics test at NASA's Langley Research Center in Hampton, Va. NASA researchers study people's perception of aircraft sounds, especially the role of rattle noises and vibration. They use this information to help design quieter aircraft. Credit: NASA Langley/Sean Smith
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Gold-colored foam wedges shield test subjects from outside noises during an acoustics test at NASA's Langley Research Center in Hampton, Va. NASA researchers study people's perception of aircraft sounds, especially the role of rattle noises and vibration. They use this information to help design quieter aircraft. Credit: NASA Langley/Sean Smith
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