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The hypothesis that there is no universal truth is self-defeating. It isn't necessarily wrong, but any deduction you would make from it meaningless, and if you truly choose to believe you should fall into solipsism. You yourself must believe in some universal truths, otherwise you would not attempt to communicate with other beings. So, in order to have any kind of discussion, you must start from a point where you believe that at least a large part of everyday experience (including other beings, their minds, physical objects, their interactions, our observation thereof and many others) exist in a meaningful sense, outside your own cognition. Now, any extrapolation from these base assumptions, is what we should think of as physics. For example, if I assume my eyes exist and my perception of the world is meaningful, then I must also conclude that the moon I see through a telescope exists to the same extent, and it's motion as I observe it exists, and I can search for explanations of that motion etc. If I were to not assume that my eyes perceive something which truly exists, I would have no reason to stand in front of a computer screen, hitting keys on my keyboard and watching the letters appear on the screen - it's possible in a very absolutist way, but it's simply not a productive way of looking at the world. |