Daily GK Quiz Game 471
Test # 471
[16-Apr-2025]
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Fact
Detroit policeman William L. Potts is credited with inventing the modern street traffic light in 1920. He worked out an electric light system that allowed him to control three street intersections from one tower He picked the red, yellow and green because railroads used them. .. More >>
Detroit policeman William L. Potts is credited with inventing the modern street traffic light in 1920. He worked out an electric light system that allowed him to control three street intersections from one tower He picked the red, yellow and green because railroads used them. .. More >>
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Every square inch of the human body has an average of 32 million bacteria on it. .. More >>
Every square inch of the human body has an average of 32 million bacteria on it. .. More >>
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