“The thin，wooden panel on which the Mona Lisa is painted in oil has changed shape since experts checked it two years ago.”the museum said.Visitors have noticed changes，but repairing the world's most famous painting is not easy.Experts are not sure about the materials the Italian artist used and their current(现在的)chemical state.

　　Nearly 6 million people go to see the Mona Lisa every year，many attracted by the mystery of her smile.“It's very interesting that when you' re not looking at her，she seems to be smiling，and then，you look at her and she slops.”said Professor Margaret Livingstone of Harvard University.“It' s because direct vision(视觉)is excellent at picking up detail，but less suited to looking at shadows.Da Vinci painted the smile in shadows.”

　　However，the actual history of the Mona Lisa is just as mysterious as the smile.Da Vinci himself loved it so much that he always carried it with him，until it was eventually sold to France's King Francis I in 1519.

　　In 1911，the painting

　　was

　　stolen

　　from

　　the

　　Louvre Museum by a former employee，who took it out of the museum hidden under his coat.He said he planned to return it to Italy.The painting was sent back to France two years later.

　　During World War II，French men hid the painting in small towns to keep it out of the hands of German forces.

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