The notion of Local Inertial Frame is crucial to understanding Nature and in particular General Relativity. Notwithstanding very few popular science books not even textbooks emphasize enough its fundamental character.
Felix Alba Juez
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The past and the future are not a collection of instants shared by all space but a collection of events that correspond to a possible relation of causal order with the present event.
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It is not the reverence for words but for their meaning that determines our deepness of comprehension of a given assertion about Nature.
- Felix Alba Juez