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Outside temperatures are warm in Sochi, which has been a challenge for skiers and snowboarders. And inside Olympic arenas, high humidity levels have made it difficult to keep the ice perfect. But athletes have been raving about how well the ice has been treated.

Tom Steyer, a retired hedge-fund investor, is aiming to spend big money to make global warming a priority issue in this year's midterm elections.

Economic forecasters are predicting that the state's new legal recreational marijuana market will bring nearly $190 million to state coffers over a…

At nearly 14 inches long, a mammoth mollusk is still alive and growing, says the biologist who found it in Denmark. The oyster is roughly comparable to a size 11 shoe.

A photographer asked young folks in Asia to swap garb with their older relatives. The project explores the way that cultural and generational divides can be seen.

A huge amount of ancient helium rises from the rocks beneath Yellowstone National Park each week — about enough to fill a Goodyear blimp. Scientists say it's due to a huge volcano underneath the park.