02/28/2013 8:29amAn extinct fish with a spiral tooth structure rolled its lower jaw and sliced its food with razor-sharp teeth like a saw, researchers say.
02/28/2013 10:26amIt's a road trip that could test the best of marriages: Mars.
02/28/2013 1:18pmOne of the driest spots on Earth _ the Sahara desert _ is increasingly responsible for snow and rain half a world away in the western U.S., a new study released Thursday found.
02/28/2013 2:31pmYou may not have noticed it, but for several weeks last year, the Earth was surrounded by an extra ring of radiation.
02/28/2013 3:41pmMichelle Obama says people worried about youth gun violence have to do more than simply tell children they care about the problem and then wind up "going to these funerals and mourning with these kids when there's still work to do."
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