AP - Getting one of the roughly 11,500 permits granted each year to backpack overnight in the Grand Canyon has become so competitive and "unfair" that managers at the national park have decided to change the system.

AP - The third and final spacewalk of space shuttle Atlantis' mission is finally under way.

AP - Since the 1997 international accord to fight global warming, climate change has worsened and accelerated — beyond some of the grimmest of warnings made back then.

LiveScience.com - If you experience impotence, instead of a little blue pill maybe you want to apply shockwaves to your privates instead.

AP - British pop star Sting says Brazil's government should listen to the voices of local indigenous groups before building a massive hydroelectric dam in the Amazon rain forest.

AFP - India's private sector energy giant Reliance Industries Limited has announced a cash bid to buy a controlling stake in bankrupt petrochemicals firm LyondellBasell Industries.

AFP - Astronauts from the US space shuttle Atlantis began the third and final spacewalk of their mission aimed at building the International Space Station, NASA reported on Monday.

HealthDay - THURSDAY, Nov. 19 (HealthDay News) -- People's genetic makeup has been shown to affect how they respond to asthma medications, but a new study finds that many people respond well to a particular combination treatment regardless of their genes.

AP - Sixty-five world leaders have said they will attend the Copenhagen climate summit in December, and several more have responded positively to invitations, Danish officials said Sunday.

AFP - Thousands of animal species thrive in the ocean depths beyond the reach of sunlight, between 200 to 5,000 meters below the surface, an international team of scientists has reported after nearly 10 years of research.