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Shuttle evolution

Were all the shuttles identical? How did they evolve over time?

Shuttle Mission Naming/Numbering

One thing that has always been confusing it's how the numbers of the mission (e.g. STS-31) don't line up with the number of launches the shuttle had. I assume that there was some specific numbering depending on the mission type, but it would be nice what that was, if you knew from working there Kevin or just from research?