In this story, everything revolves around half a dozen footprints discovered several years ago in Laetoli, in Northern Tanzania. Until now, they were believed to show the trail of steps taken by a bear walking on its hind legs alone. But a team of scientists looked back at these marks and concluded that, after all, the fossils belong to one of the first bipedal human species. The story that is told in the magazine Nature this Wednesday solves an old mystery, but installs another. It’s just that these footprints are different from other hominid footprints found nearby in the same location. So who are they?
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