Time, according to Newton, is a primary ingredient of reality. It cannot be analysed into anything simpler or more basic
“The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time, and still retain the ability to function,” wrote F. Scott Fitzgerald, famed American author of The Great Gatsby. Time is one of those concepts that forces us to hold opposed ideas in mind. To grasp the scientific concept of time, let alone the cluster of psychological ideas that go by the same name, requires a supple mind indeed.
Modern physics asks us, in different situations, to describe time in ways that seem opposed or even contradictory. When, as a physicist, I look at time, I see three faces. I will call them ideal time, stochastic time and manufactured time.
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