These units/lessons/activities are more engaging than the typical middle school earth science textbook!

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September 2025 Editor's Pick

Modeling and Testing Physical Properties of Slime

An exploration of an engineering brief from a mock toy company leads students to explore a new slime with a unique set of characteristics. Using simple directions, students create five different types of slime and classify their slime properties against the criteria ...

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Free K-12 standards-aligned STEM curriculum for educators everywhere.
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