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A team of scientists has conducted a new study of Lucy - the world's most famous fossilised human ancestor - and concluded she probably died when she fell out of a 40 foot tree. The findings from the team of anthropologists at the University of Texas could suggest that Lucy may have been a tree dweller. Professor John Kappelman is the anthropologist who led the study. (Photo: Lucy's skeleton and a recreation of how she may have looked alive. Credit: Dave Einsel/Getty)