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Anna Raff

The Ups and Downs of Gravity
Solids, Liquids, Gases, and Plasma
Light Waves
Magnets Push, Magnets Pull
Simple Machines
Things That Float and Things That Don't

Books

The Ups and Downs of Gravity
Solids, Liquids, Gases, and Plasma
Light Waves
Magnets Push, Magnets Pull
Simple Machines
Things That Float and Things That Don't
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