Article: Humankind's first steps.(4.2-million-year-old Australopithecus anamensis is earliest known bipedal primate)(Brief Article)

FOSSIL HUNTER MEAVE LEAKEY WAS out in the scorched hills near Kenya's Lake Turkana last year, measuring prehistoric pig jaws, when her colleague Wambua Mangao shouted there was something she needed to see. He had spotted five patches of bluish tooth enamel embedded in a piece of stone, and Leakey turned it over to discover half of some ancient primate's upper jaw. Within weeks, the rocky sediments yielded the rest of the upper jaw, which resembled that of a chimpanzee, along with a shinbone that suggested the jaw's owner had walked upright like a modern human. As Leakey reported in the journal Nature last week, her team had discovered what is probably the oldest direct ...

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