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NOVA: Family That Walks On All Fours

Airs Tuesday, October 27 at 8 p.m. on KPBS TV

Above: "NOVA's" examination of a family that walks on all fours (pictured above) raises fascinating questions about genetics, society and the evolutionary history of our species.

An intense scientific debate has ignited around a quiet but extraordinary family living in rural Turkey – a family with five adults who walk on all fours. Since bipedality has long been considered one of the defining characteristics of modern humans, such a discovery raises fascinating questions about genetics, society and the evolutionary history of our species. Is this the anthropological find of the millennium or simply a unique medical case? "NOVA" sets out to unravel the controversy and meet the individuals who have captured the imagination of scientists around the world in this moving documentary. Watch a preview.

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