Theodore John Kaczynski@Quentel @Forestofenchantment Centimeter accuracy GPS is possible because of Relativistic corrections. Photoelectric effect although not discovered by Einstein, was explained by Einstein using the math of Planck. It might have helped optimize LEDs which are used to make monitors and digital cameras. But to be fair a lot of this can be done without an overarching theory. Engineering optimizes new phenomena by rules of thumb.
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