A set of 1.43-million-year-old fossil footprints preserved along the margin of an ancient lake in northern Kenya is offering paleoanthropologists new evidence about the size, gait and social lives of the beings who made them and reopening questions about which species they belonged to. One of 1.43-million-year-old footprints found at the GaJi10 site in the Koobi Fora Formation in northern Kenya; a 15-cm (6-inch) ruler is shown for scale. Image credit:...
