You must have seen traffic signals in every city. All traffic signals have three colors. Which are red, green and yellow. But have you ever wondered why vehicles always stop at the red signal. Let us tell you that there is a main reason behind using red, yellow and green lights in traffic signals. According to a report by Live Science, the colors used in traffic signals initially were based on the navigation system of ships. Ships had red and green signals. By looking at these, the crew of the…
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Who Invented this lift: Lift is most important in a tall building, who invented this lift and when?
There are many tall buildings built all over the world. All these buildings have lifts to reach the upper floors, because without a lift it takes a lot of time and effort for a person to go on foot. But the question is, who invented this lift and when was it first built? Lift In a tall building Press a button and go from upper floor to ground floor or from below to above in minutes. For this you do not need to climb a lot of stairs. How difficult…
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