Philosophers maintain that the future is similarly nothing more than a mental construct, an anticipation, a grouping of thoughts. Because thinking itself occurs strictly in the “now”—where is time?Does time exist on its own, apart from human concepts that are no more than conveniences for our formulas or for the description of motion and events? In this way, simple logic alone casts doubt on whether there exists anything outside of an “eternal now” that includes the human mind’s tendency to think and daydream. Physicists, for their part, find that all working models for reality—from Newton’s laws and Einstein’s field equations through quantum mechanics—have no need for time. They are all time-symmetrical.
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