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. Right! Heart Reef, part of Australia’s Great Barrier Reef, is made of living coral. What makes this heart so fragile? Photograph by David Doubilet

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