2 studies find gas in Pa. drinking water; one links it to natural source, other to drilling
2 Russian astronauts take spacewalk at space station, perform bit of outside maintenance
AP PHOTOS: Supermoon is largest and brightest full moon of year
Study: Poor, minority students see biggest advantages from charter schools; general gains seen
It's that time of the year: Supermoon shines brightly this weekend
Cicadas are mostly harmless, but arborists warn that small trees and shrubs could be damaged as female cicadas lay their eggs.
AP IMPACT: Post-Great Recession, US and other nations take divergent paths on higher ed, jobs
Researchers question Yellowstone grizzly bear rebound as government weighs lifting protections
Digital atlas offers highly detailed three-dimensional look at human brain; will aid research
Chinese astronauts twirl gyroscopes, strike kung fu poses in students' lecture from space
It is big and kind of pretty, but this plant can burn your skin or even blind you.
Officials at the Smithsonian Conservation Biology Institute in Virginia say they've had a baby boom of endangered species in recent months and are sending some animals to other facilities.
Study: Vaccine against sexually transmitted HPV cut infections in teen girls by half
Germany's Merkel makes clear Europe will defend GM food stance in US trade talks
Scientists predict summer 'dead zones': Larger in Gulf, smaller than usual in Chesapeake Bay
Airborne laser spots ancient city complex of roads, canals hidden under dense Cambodian forest
Scientists from around the world meet in South Dakota to discuss new photo-taking satellite
Nobel Prize-winning physics professor from Cornell, Ohio State dies at age 77 in Maine
Jazz legend Cecil Taylor, US chip inventor and Japanese evolution biologist win Kyoto Prize