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Louis Leakey was the husband of Mary Leakey, a renowned paleoanthropologist. Together, they made significant contributions to the field of human evolution. Louis Leakey discovered the first hominid fossils in East Africa, while Mary Leakey discovered the remains of the early hominid species Australopithecus afarensis, known as "Lucy." Their work helped to establish the African continent as the cradle of humankind and provided crucial insights into our evolutionary history.