Where Did “Lucy” Spend Her Time?

BALTIMORE, MARYLAND—A report in The Washington Post suggests that the early human ancestor Australopithecus afarensis, which had hips, feet, and legs suitable for walking, and ape-like long arms with curved fingers, probably spent a significant amount of time in trees. Biological anthropologist Christopher Ruff of Johns Hopkins School of Medicine and his colleagues compared X-ray microtomography scans of Lucy, the 3.18-million-year-old Australopithecus afarensis fossil specimen, with scans