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eBook: Mark Twain 404094-EB Strengthening Physical Science Skills for Middle & Upper Grade - Grade 6 - 12 braces_splints_slings_334147 while keeping you healthierDevelop interest and confidence in advanced science by building science vocabulary and math skills while exploring physical science concepts! In Strengthening Physical Science Skills, topics include matter, gravity, density, motion, simple machines, electricity, light, and more.