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This picture released by the National Geographic on March 12, 2012, shows the endoscope and sampling tool used to investigate the air gap behind the Vasari mural in Florence's Palazzo Vecchio. (DAVE YODER/National Geographic - AFP/GETTY IMAGES)

Above: This picture released by the National Geographic on March 12, 2012, shows the endoscope and sampling tool used to investigate the air gap behind the Vasari mural in Florence's Palazzo Vecchio. (DAVE YODER/National Geographic - AFP/GETTY IMAGES)

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