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The lessons need to be quick (20 min. max) and academically vigorous. The school district I work for has mandated a whole bunch of silly curriculum so I have very little time for the useful stuff.

No,Boy, Bigwig, you're not lonely. Only your request might not be on the menue. I've been a teacher part of my life, but I always took it making lessons is part of a teacher's job.(the true vocation). I may be wrong , but I don't think you will find ready-made GOOD lessons on the internet.(Not sure about that though)