Original thoughts are possible due to the advancement of human knowledge. The idea that gravity isn't really a force, but a byproduct of the warping of space, was not around until after the (original) idea that matter and energy are the same thing.
The idea of sampling (for music) did not come into being until after the technology was in place to make it possible.
Etc. Etc.
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Ass, gas or grass. Nobody rides for free.
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