About a third of bird species in U.S. need conservation help, new report says
"Guitar shark" among the 866 new marine species discovered in ocean
Earliest human face fossil from Western Europe revealed in study
Athena moon lander ended up on its side, bringing mission to an early end
22% of butterflies in U.S. disappeared in 2 decades, study finds
How "asteroid detectives" protect Earth from potential impacts
Commercial moon lander ready for descent to lunar surface
Polar bears in Canada are on the edge of extinction. Here's what's being done to protect them.
