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           Everyone has to want to go back on the time and try to change something and to feel something. The first one who listen the word time machine he had felt that it is impossible and meaning less, after that the development of science and technology say’s time machine is not fictional and it is possible. In this topic we are discussing about the main working principle of time machine.     Before going to explain about the time machine, get a basic knowledge on the Time. According to the general theory of relativity the Time Dilation (slow and speed in time to the observers) is based on two things. 1.          Speed: when speed increase the time will be slow and vice versa 2.        Gravity: when gravity increases the time will be slow and vice versa WORKING PRINCIPLE OF TIME MACHINE USING SPEED    In this time machine works on the general t...