It was Henri Bergson’s fault, and the issue was time, says Jimena Canales at Nautilus:
According to Einstein, philosophy had been used to explain the relation between psychology and physics. “The time of the philosopher, I believe, is a psychological and physical time at the same time,” he explained in Paris. But relativity, by focusing on very fast phenomena, had shown just how off-the-mark psychological perceptions of time really were.
Psychological conceptions of time, Einstein insisted, were not only simply in error, they just did not correspond to anything concrete. “These are nothing more than mental constructs, logical entities.” Because of the enormous speed of light, humans had “instinctively” generalized their conception of simultaneity and mistakenly applied it to the rest of the universe. Einstein’s theory corrected this mistaken generalization. Instead of believing in an overlapping area between psychological and physical conceptions of time (where both were important although one was admittedly less accurate than the other), he argued that they were really two distinct concepts: a mental assessment (the psychological one) that was wholly inadequate when compared to the “objective” concept: physical time.
Bergson and Einstein accepted that an essential difference existed between psychological and physical conceptions of time, yet they made different deductions from this.More.
See also: Scientific American tells us we may live in the past of a parallel universe
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