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February 13 2014

19:02

Ancient DNA Ties Native Americans From Two Continents To Clovis : NPR

The mysterious Clovis culture, which appeared in North America about 13,000 years ago, appears to be the forerunner of Native Americans throughout the Americas, a study of DNA evidence suggests. Remains from an infant buried more than 12,000 years ago at a Clovis site in modern Montana held the genetic key. http://www.npr.org/2014/02/13/276021092/ancient-dna-ties-native-americans-from-two-continents-to-clovis

February 10 2011

20:20

How Tough Is it to Build a Dirty Bomb? | PBS NewsHour | Feb. 8, 2011 | PBS

Science correspondent Miles O'Brien examines the threat that radioactive "dirty bombs"could pose to cities in the U.S., and what's being done to prevent a radiological attack from happening. http://www.pbs.org/newshour/bb/science/jan-june11/dirtybombs_02-08.html
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