FILE - In this April 12, 2011 file photo the Leonardo Da Vinci painting "Lady with an Ermine" is displayed by art conservators at the Royal Castle in Warsaw, Poland. Recent tests show that bark ... more 
FILE - In this April 12, 2011 file photo the Leonardo Da Vinci painting "Lady with an Ermine" is displayed by art conservators at the Royal Castle in Warsaw, Poland. Recent tests show that bark beetles and old age have weakened Leonardo da Vinci's 15th century painting "Lady with an Ermine," which is housed in Poland's National Museum in Krakow. (AP Photo/Alik Keplicz) less 
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Associated Press | Photo By Alik Keplicz
Mon, Mar 26, 2012 2:56 PM EDT