Is it possible to make scientific observations through armchair philosophy while

Is it possible to make scientific observations through armchair philosophy while

Is it possible to make scientific observations through armchair philosophy while bypassing the scientific method? For example, a caveman with a powerful brain might have been able to hypothesize and describe in detail what radio is despite not a single radio message even being sent until tens of thousands of years later. Wasn't that caveman right anyway that radio does exist even though he had no way to prove it? Isn't much of metaphysics like this too?

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