The direction of time
the nature of time has puzzled scientists and philosophers for centuries. Is the universe symmetrical with respect to time or is there a preferred direction of time? Now, this question is closer to an answer with two experiments in Geneva and Illinois reporting clear evidence that the world is not symmetrical with respect to. Indeed, it does matter which direction the arrow of time takes.
Time has always been a special variable in physics. Though relativity tells us that space and time are intimately linked, yet there are fundamental differences. For instance, we can compare observations taken with the experiment aligned in two different directions in space but it is not possible to compare results of experiments with two directions of time. Even then, time reversal is usually taken to be given in the ordinary world.
In physics, the mathematical operation of replacing the expression for time with its negative in formulae or equations
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