Scholastic Lesson Plans: a searchable, free collection of plans and projects
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Looking for ideas to support a new interest, or a whole unit study? There's lots to choose from here! There are hands-on science projects, multimedia-supported lessons, book club ideas... Most are designed for classroom use, but all the lessons I've looked at are very well-suited to homeschooling.
There is the most available for elementary students, but pre-k through 12th grade are represented. Interesting to just browse if you're feeling uninspired.