AP - A pair of astronauts stepped out on the third and final spacewalk of their mission Monday to take care of some odd jobs at the International Space station.

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 - 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.