The Trump administration announced plans Wednesday to add another militarized zone to the southern border — this time in California — as part of a major shift that has thrust troops into border ...

The shape of Maine is nothing if not peculiar. Quite unlike, say, the perfect rectangles of Wyoming and Colorado, Maine flouts geometric sensibility, from its craggy coastline to the great span of its ...

A Mars-size object called Theia smashed into Earth, and the debris coalesced into the moon. Now scientists believe they may have identified pieces of Theia at the bottom of Earth’s mantle. A new study ...