However, that caused me to take another look at the Tech Tree, specifically the "Physical Science" series of Advances, and in particular the sequence of "Alchemy first, Geometry second". By any measure, that is a strange choice for the Ancient era since Alchemy is usually associated with the Medieval-era pursuit of the "Philosopher's Stone" (i.e. the failed attempts at turning base metals into Gold). Accordingly it has been replaced with Mathematical Modeling, which reflects the Ptolemaic developments in 100-200 AD. This also requires moving Geometry back one space, as it was discovered and refined during the earlier classical Greek era and was a precursor to Ptolemy's efforts. With that, several changes are needed to other Advances:
- Iron Working currently requires Alchemy. Change this to Geometry.
- Siege Weapons currently require Geometry. Change this to Iron Working (since the Onager was an Iron Age siege engine)
- Hullmaking currently require Geometry. Change this to Iron Working (the Quinquireme was an Iron Age vessel, so this also makes sense)
- Classical Education currently requires Geometry. Change this to Mathematical Modeling.
- Civic Engineering currently requires Geometry. Change this to Mathematical Modeling.
- Chemistry currently requires Alchemy, which was completely redundant since Alchemy was 4 Advances earlier in the same "Physical Science" chain. Anyway, Gunpowder is a better pre-req.
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