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9 votes
Accepted

Where did the popular idea of spacetime come from?

A nice history was given by Archibald, R.C. (1914), "Time as a fourth dimension", Bull. Amer. Math. Soc., 20 (8): 409–412 https://doi.org/10.1090%2FS0002-9904-1914-02511-X Regarding Wells, ...
Batiatus's user avatar
  • 496
6 votes
Accepted

Did the ancients know how to construct a correct klepsydra?

At least, in ancient Greece and Rome I am not aware of the vessel shape being used as a way to uniformize the flow of water. Instead, "correct" clepsydras were constructed using a different ...
Conifold's user avatar
  • 77.1k

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