美国科学60秒-SSS 2015-06-08（在线收听）

 One an old route humans took when they first migrated from Africa into Europe seems that they might have marched the path. Not like constant grettle who consciously left bright chromes, ancient humans ate as they tracked and they are appeared to have chark the side of packaging for some of their slimy assesstments. Snails, conventional wisdom has been that humans initially traveled from Africa to the near East then to up around the Mediterranean through Lavernun before heading into Europe some 40 to 50 thousands years ago. But recently, some scientists of DRI's that humans made it to Europe first and then headed East. Now there is more support for the old view that humans travel through the Lavant on the way to the Europe in the form of the shells of adbol marine snails. The study is on the proceedings of the National Academy of Sciences.  Researchers evaluated shells from an archaeological sight dated to the upper palliate ethic in Lavenon. The shells were mostly intact, except the taper pointy tip have been removed, most likely for easier access to the medium side. The scientists calculated the age of the shells by a variety of methods and they found out that the snails dated back almost 46 thousands years. The earliest evidence of modern human remains in Europe seems to be no more than 45 thousands years old. The snail evidence that adds weight to the hypothesis that ancient people passed through the Lavant on their way to Europe and not at the snail's pace either.