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Sooner or later someone, quite often a child, will ask about the mysterious silver button in the museum case. What is it? What does it do? What would happen if you touched it?
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What determines that a work of art is authentic? Oh, go ahead, take a stab at it. Did you say the paint? Good. How about the brush strokes? Or the style? Well, there is something else and you'd never guess what it is.
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