Go ahead! Stretch your e-magination and test yourself. Click on the right answer and get the full scoop. Get it wrong—try again. It’s a mosaic of tiny, delicate tiles of glass.   The paper for this Valentine’s Day card is very old.   It’s a living organism.   The blueberry gelatin was turned out of the mold too early, and it’s only half formed. What makes this heart so fragile? Photograph by David Doubilet

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