Was This Mona Lisa Painted Alongside Da Vinci's? [Art]

Leonardo da Vinci's Mona Lisa is, arguably, the most famous painting in the world. But would it be devalued if it wasn't the only one? We might soon find out, because a very similar painting from the same period has surfaced—and it's by a different artist. In fact, it's by da Vinci's pupil. More »

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