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Electronics and underlying principles has not have much new, but a lot of refinement and new technologies. Still how they are used has gone massive leaps in past 20 years. Moving from analog to digital and from digital circuit switched to packet switched. Whole development of Internet and small hand held devices. Increase in computing power, storage and transfer has had quite massive effects.
Key thing to notice is how apparent change might be small, but underlying technology is massively complex. You get some new devices and the look and functions increase. But how it's done and what is under the cover is hidden. Information needed to make most modern things is quite massive...
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