When the U.S. was born, humanity was still seven years away from balloon-borne flight. Where might we be another 250 years from now, should the nation be fortunate enough to survive that long?

When I walked into Realbotix's headquarters in Las Vegas, technicians crowded around humanoid robots fresh from a trade show, replacing worn motors and repairing facial glitches. The maintenance ...

An image taken by Curiosity last month has sparked claims of a long-lost civilization on the Red Planet after some spotted a ...