An agreement reached Saturday pushes debates on U.S. participation into the administration of a new president.

  Can the emerging superpower fast-forward through the most carbon-intense phase of nation building?

  Sharpshooters will be used to cull an elk population that roams and sometimes rampages through Rocky Mountain National Park, according to park officials.

  Many travelers are chasing what may be a modern-day version of an old human impulse ?to behold an untrammeled frontier.

  A vanguard group of universities is giving corporations greater access to ivory-tower laboratories ?for a price.

  A rare sunlight and chlorine reaction tainted the water of two reservoirs that supply drinking water to Los Angeles with a cancer-causing chemical, utility officials said Friday.

  What sustainability is really about.

  Recycling programs are improving the environmental impact of all the packaging Americans consume, says Patrick J. Moore, chairman and chief executive of the Smurfit-Stone Container Corporation.

  Well-designed studies suggest several ways to improve the brain?s viability.

  The ritual of showing how much we care also makes us feel good.

  A controversial effort to stop malaria zeroes in on mosquitoes and the parasites that live inside them.

  After years of searching, Shinya Yamanaka found a way to turn adult skin cells into the equivalent of human embryonic stem cells without using an actual embryo.

  If we humans are congenitally inclined to drink, researchers caution, we are designed to do so only in moderation.

  Parasites that breed in fish farms kill so many passing juvenile wild salmon that they threaten the survival of fish populations in some rivers and streams, Canadian researchers say.