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Edison experimented with thousands of types of filaments

when designing the light bulb. These were controlled and systematic, and I would not characterize this work as "more-or-less messing around."
His experiments yielded plenty of real data.

I doubt that he was "messing around" when he developed the phonograph, but I'm admittedly speculating on this point.

As far as your last point, it escapes me. Experimentation is used to gather data, so I don't see your distinction.


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