It took almost 2 centuries between the time that atoms were first postulated, and were actually seen under a microscope. Today, quantum physics are the basis for all electronics, even though scientists still regard most of the rules by which quantum physics acts in electronic equipment as theoretical.
Of course, we also used to think there was "ether," and quite a bit of scientific prediction and experiment was based on that assumption. Not every prediction pans out, but often it leads to the real answers.
Either way, trying to make those predictions can be enlightening, stimulating, and fun! (Until your predictions lead you to things like Soylent Green, of course...)
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