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Device for avoiding a collision in a lane-change maneuver of a vehicle: It’s not quite KITT, the artificially intelligent Trans Am that starred alongside David Hasselhoff in the 1980s television show Knight Rider , but a newly patented computerized driving system takes a step toward the car as driving companion. Not only will it upbraid you when you are about to make a boneheaded lane change, it will actually take control of the steering wheel and prevent a collision

Incapacitating light beam: The suspect is going for his gun, and the police officer doesn’t want to shoot. The founders of a company called Genesis Illumination hope police officers will soon be reaching for a StunRay instead of a gun or Taser.