When traveling near the speed of sound, the plane came up against a "sound barrier"—as though the velocity of sound represented a wall through which a plane could not move. With technological ...

An curved arrow pointing right. Most people think that the walls alongside highways, often made of concrete, brick, or wood, are for crash safety or privacy. But those walls were actually ...

On February 10, in the skies above the Mojave Desert, the Boom Supersonic XB-1 test jet roared past Mach 1, tearing through ...