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The announcement marks the first official naming of any of the remains that have been revealed by Lake Mead's dropping water levels.

Radiocarbon dating has significant shortcomings. New research is now providing tools for dating ancient remains more precisely.

Afghanistan to be used as any kind of safe haven. >> director clapper, you were head of national intelligence when they killed osama bin laden. >> that's a great question, anderson, and something i've been wondering about since we had to do this from over the horizon. and in the case of osama bin laden obviously we had had his body and dna analysis to prove it was actually him. so this is not just an intel guy but this is a tremendous intelligence feat if as briefed, and if this was in fact zawahiri and not a double. from the president's statement

They killed osama bin laden can you talk about the kind of intelligence that a president would have likely needed, or wanted to give an operation like this the greenlight? >> that's a great question. anderson, something i've been wondering about since we had to do this from going over the horizon. in the case of osama bin laden, obviously, we had his body and dna analysis to prove that it was actually him. so, this is not as an intel guy this is a tremendous intelligence feet. if asbury, and if this was in fact zawahiri, and not a double. but from the certitude of the presidents statement, it

According to new research, sharks that live closer to our coastlines may be of greatest conservation concern as more than 70% of species that wind up in the worldwide shark fin trade are at risk of extinction.