Solving da Vinci mural mystery

Researchers may have discovered traces of a lost mural by Leonardo da Vinci by poking a probe through cracks in a 16th-century fresco painted over another work on the wall of the Palazzo Vecchio in Florence, Italy. (National Geographic via Associated Press)

Researchers may have discovered traces of a lost mural by Leonardo da Vinci by poking a probe through cracks in a 16th-century fresco painted over another work on the wall of the Palazzo Vecchio in Florence, Italy. (National Geographic via Associated Press)

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