Pandia Press
Spans roughly grades K–12, with REAL Science Odyssey Level 1 for grades K–6, Level 2 for grades 6–10, and History Odyssey for grades 6–12. 
Pandia Press is a secular homeschool publisher that’s earned a loyal following for its story-based history and lab-rich science curricula. Their History Odyssey and REAL Science Odyssey series combine engaging readings, primary source work, and structured activities with teacher guides that are clear without being rigid. Developed by homeschoolers and educators, the books are intentionally multi-age friendly, so you can often teach siblings together and adjust assignments up or down. Parents value the secular stance, flexible scheduling suggestions, and emphasis on real experiments rather than just watching videos. While not the cheapest option, the ability to reuse teacher guides and PDFs across multiple children makes the cost more manageable over time.
Individual Pandia Press texts generally range from about $22.99 for History Quest narrative books up to around $66.99 for upper-level REAL Science Odyssey textbooks, depending on title and format. 
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