Biplanes once ruled the skies in the pioneering days of aviation and World War I. A newer version of the biplane could reach supersonic cruising speeds without causing ear-splitting sonic booms, according to computer simulations by MIT and Stanford University researchers. “The sonic boom is really the shock waves created by the supersonic airplanes, propagated to the ground,” Wang says. “It’s like hearing gunfire. It’s so annoying that supersonic jets were not allowed to fly over land.”

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via: live science