I believe most colleges--and elementary and secondary schools--use TIAA-CREF. I think it's the second largest pension fund in the country, and it seems to be pretty good.
As you say, teaching won't make you millions, but in many parts of the country, it pays well enough to be a reasonable tradeoff for doing what you enjoy
In countries like Germany and Japan, though, secondary educators are paid very well indeed. That seems to pay off in better-educated students.
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