Greenland ice sheet shrinking fast: NASA

WASHINGTON (Reuters) - The vast sheet of ice that covers Greenland is shrinking fast, but still not as fast as previous research indicated, NASA scientists said on Thursday.WASHINGTON (Reuters) - U.S. and British scientists said on Thursday they had found a way to hide an object from microwave radiation in a first step toward making a what they hope will be an invisibility cloak.WASHINGTON (Reuters) - This year's ozone hole over Antarctica is bigger and deeper than any other on record, U.S. scientists reported on Thursday.