| http://www.w3.org/ns/prov#value | - Many different hypotheses were proposed, from human overkill to climate change, but more unusual was an idea largely publicized in 2007.Geophysical studies presented in spring 2007 suggested that perhaps an extraterrestrial bolide vaporized in the Earth's atmosphere caused the extinction of the North American Megafauna some 13.000 years ago.In 2009 this hypothesis seemed to be further confirmed by
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