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Carved in stone on a Civil War-era bridge -- a world-class feat of engineering that stands a couple miles northwest of Washington -- are the names of builders and officials of the day.

A key name, however, is missing. New research shows that Virginian Alfred R. Rives led the design and construction of the Cabin John Bridge. Also called the Union Arch Bridge, the aqueduct and roadway reaches 220 feet across Cabin John Creek in a single span -- the world's longest single-span masonry bridge for nearly 40 years and the nation's longest still today.

Leading up to the San Francisco Game Developers Conference (GDC), BBC Worldwide today announced a major new partnership with game developer Three Rings to create BBC Worldwide's first ever free-to-play multiplayer online game centered around the blockbuster drama television show, Doctor Who. For the first time ever, players from around the world will be able to follow in the footsteps of the eccentric and brilliant Doctor by travelling through time and space, exploring new worlds and encountering many alien races, both friend and foe. Titled Doctor Who: Worlds in Time, the game allows players to enter the TARDIS and be set a challenge by the mysterious Time Lord to help him defend civilized culture against infamous Doctor Who enemies.