NPR intern Poncie Rutsch takes a crack at making a big sound. Meredith Rizzo/NPR hide caption

toggle caption Meredith Rizzo/NPR

Why Knuckles Crack

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Cropland Capture's developers hope players will find where crops are grown amid Earth's natural vegetation in satellite images to shine a light on where humanity grows its food. Courtesy of the International Institute for Applied Systems Analysis hide caption

toggle caption Courtesy of the International Institute for Applied Systems Analysis