Science

Teachers Try Science

This site has a collection of over 500 science lesson plans for grades 5 through 12. There is also a smaller selection of kid's experiments. There's a good search function, so you should be able to find what you're looking for, and all resources are free.

Kesler Science

Middle school level science curriculum. There are complete lesson plans (designed for classroom use, but adaptable for homeschool) including powerpoints, interactive notebooks, labs, and assessment resources. There are some free lessons available to try out. Purchase options include individual units at a relatively low price, or you can invest a few hundred dollars for access to everything.

24/7 Science

A kid's science site from Lawrence Hall of Science at UC Berkley. There several interactive activities, online games, and hands-on experiments available for free. You can also purchase classroom science kits that could be useful for co-op classes. 

42 Electronics

Curriculum and parts kit for learning electronics, robotics, and Python programming. There is one level available now, and 3 more coming out over the next year. Price is pretty reasonable, and the writers appear to be a homeschooling family!

Fat Dogs and Coughing Horses

This oddly named resource comes from the Purdue Univ. College of Veterinary Science. It's a unit study curriculum exploring animal and human health topics. The lesson plans are written for 3rd and 9th grade classrooms, but can be adapted for home use and different level learners. Some lessons require some equipment that may be tough to find, but there are activity books, internet links, and lots of great hands-on ideas. 

Happy Atoms

This resource includes physical models and a tablet app for exploring the world of atoms and molecules. Students build with the model atoms and use the app to learn about what they have built. Reasonably priced, and looks like a great tool for hands-on learning.

Biology Corner

A website with lesson plans, worksheets, labs, and activities on biology topics. Materials appear to be for jr. high and high school levels. It may take some digging to find exactly what you want, but everything is free.

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