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Similarly, when we find arrowheads or other artifacts, it's not vitally important that we know the name of the person that constructed them.
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Not the
name, no. But it does matter to know the nature of the creator. Were they made by ancient people or some dude in his garage last Thursday? In other words, are they authentic artifacts or forgeries? You can't answer that without some knowledge of who made them.
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No, it doesn't One doesn't have to consider "what generated gravity" in order to research the effects of gravity on other phenomena.
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Yet to develop a complete theory of gravity there is a need to determine the fundamentals of gravitation. We can study the effects, but that doesn't lead to a full understanding of the mechanics of gravity.