Science

Scientists have seen gravitational ripples from two black holes colliding. The discovery is the culmination of decades of work. Albert Einstein first predicted such ripples should exist a century ago.

Crews are working to permanently plug the methane gas leak that has forced hundreds from their homes in the Porter Ranch area of Los Angeles. Southern California Gas Company says the leak was temporarily fixed Thursday, after nearly four months of spewing methane into the air.

Social scientists have been studying Valentine's Day gifts, and research shows: The more you love someone, the more likely you might be to give selfish gifts.

Behind the headlines and news conferences announcing the discovery were decades of hard work, hundreds of scientists and more than a billion dollars in taxpayer funds.

Some of the genetic variations in human DNA that have been linked to quick clotting or depression or diabetes lie within or near the genetic stretches we picked up from Neanderthals, a study finds.