Free "History of Science" Lesson Plans for 6-12 gr.
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Written for teachers, these are interdisciplinary lesson plans. Some consist of only one or two activities, while others could fill a semester or more. The lessons I've read are clear, fully explained, and include extensive bibliographies. Most are written with the expectation that students will be working in a group. They could a be a valuable resource for a homeschool science club.
Some of the lesson plans would be a fabulous add-on to a history or book club. The Lewis and Clark Scientific Adventure would be a wonderful way help kids appreciate challenges and importance of their famous journey, or a great accompanying activity after reading The Captain's Dog