Science — physics, in particular — can help us make really accurate predictions about the real world, but makes no guarantee that those predictions will be of any practical use.
What’s the tallest loop-the-loop roller coaster that we could ever build and ride safely?
Blake Bullwinkel
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Is not physics per se what limits the practicality of the prediction, but the assumptions made to build the model. In the ideal situation that frames the problem, the result is of little practical use, of course, because at not point did the model include practicalities, such a as friction, the kind of building materials and so on. In other words, physics will answer just the question one asks; it seems unfair expecting physics to answer the question that no one asked…

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