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One amazing thing is how long it took to catch up with ancient Greek science. That civilisation achieved a lot relative to the tools they had available for measurements and testing.

Things such as finding out that the Earth was a sphere and posing the idea of elements were great achievements considering the lack of technology available. Maths and physics were two things the ancient Greeks were pretty good at.

And much of it had to be re-discovered.

...

In fact the history of string theory is one I've found to be interesting. Ideas resembling string theory have been posed several times throughout history before our modern iteration. In fact, it is claimed that modern string theory came directly out of a maths textbook that was several hundred years old*.

(*I don't know how reliable this claim is though)