...research.Results of the study, led by Christopher Lepre of Rutgers University and Columbia University's Lamont-Doherty Earth Observatory, appear in Thursday's issue of the journal Nature.The stone tools, known collectively as Acheulian...

...ice factory" and is blown to this belt, which is like an "ice cube tray," said Robert Newton of the Lamont-Doherty Earth Observatory at Columbia University. That "sea ice refuge" will be good for polar bears and should continue for decades...

...conditions much more quickly than we had thought," said team member Meredith Nettles of Columbia University's Lamont-Doherty Earth Observatory. Juneau Empire reporter Elizabeth Bluemink contributed to this story.