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.

Tuesday, 7/17/07 from 8-9 p.m. and 1:30-2:30 a.m. ET
Friday, 7/20/07 from 4:30-5:30 a.m. ET