With special relativity, we can no longer declare two events to be simultaneous in any absolute sense. Instead, we can only say that they may appear simultaneous from some particular frame of reference. (Physicist Brian Greene calls this "one of the deepest insights into the nature of reality ever discovered.")
— Dan Falk (1966 - ), Canadian science journalist, broadcaster, and author. In Search of Time: The Science of a Curious Dimension (2008, AKA In Search of Time: Journeys Along a Curious Dimension and In Search of Time: The History, Physics, and Philosophy of Time).
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