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Studies have long shown that Western parents speak a singsongy high-pitched language to babies. Now researchers have gone to the Amazon, to the Hadza people and more to see if it's a global thing.

South africaUnited statesSan diegoSarah waiswaErik thiessenCourtney hiltonCody moserMbendjele bayakaUniversity of california berkeley departmentHarvard university music labYale university haskins laboratoriesHarvard music labLab at carnegie mellon universityPhotographer sarah waiswaHarvard universityMusic lab