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How do you find out if there’s a secret room hidden in an ancient pyramid? Not in the same way you’d discover hidden spaces in a home you’re remodeling—that is, by busting through walls. You’ve got to be a tad more careful, like the scientists who recently suspected that there might be an undiscovered chamber hidden in the Great Pyramid at Giza. Following up on their hunch, the researchers turned to muography—an x-ray-like technique used to detect voids or empty spaces behind layers of earth and stone.