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Originally Posted by JrKASperov
Using "observe" instead of "see" makes no difference. You still observe your arm being bent when partly submersed in water, any explanation why we observe it so is simply that: an explanation or theory. The point is that most people do not go on observation alone and use their ratio more than they suspect, just like in this case. It is exactly this ratio which depends highly on what "is written down" or "what other people told us".
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I meant using other sensory input and possibly even logic in addition to sight. You can see your arm bend when in water, but you can't feel it. If you have ever badly broken any major bones, you know that having a body part twist in a place that is not a joint hurts like hell. You can also, if you want, submerge a stick in a glass or plastic container you can see though and look at it from different sides. You will note that the stick seems to bend differently depending on the relative position of your eyes. Any waves or ripples in the surface of the water will also affect the stick. If you are still convinced that the water makes the stick alive and frightened, so that it tries to flee your gaze; and very, very soft, so that it is affected by tiny surface currents in the water; you can don some swimming goggles and place your head underwater.
In conclusion, you can test whether something is true. And see patterns in the things you have already tested to deduce whether something as of yet untested is true. All this you can do yourself, with no help from textbooks. The human brain seems to be somewhat well equipped for detecting patterns.
Quote:
Originally Posted by JrKASperov
Re your second point, explain why the velocity of light (in vacuum) is constant using current physics.
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Touché, I suppose.
I don't know
why constants are constant or why the formulae are as they are, and don't think anyone else knows either. But I don't think I could explain it even
with magic, without ultimately resorting to an "it just is"-argument. Addition of ghosts or pixies or wizards or demons or similar personal forces still does not explain
why the world is made by the aforementioned to work as it does.