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This simple construction activity teaches the importance of architectural structure. Learners build and test designs for a paper "doghouse" strong enough to hold the weight of a jumbo dog biscuit.

In this engineering activity, learners explore simple machines and then build cardboard automata using cams.

In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet.

In this activity, learners use mirrors to write secret messages to a friend. Use this activity to explore letters, optics, and/or symmetry.

In this physical sciences activity, learners use science to solve a "crime." Learners collect trace evidence (glitter) and explore its characteristics, such as color, size, shape, and light reflection

In this activity, challenge learners to design a roller coaster ride for a marble using cardboard and other simple materials.

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

This guide features three related ramp explorations in which learners investigate the following science concepts: when placed on a ramp, some objects roll, others slide, and others stay put; the shape

In this design challenge activity, learners use tubes of newspaper to make a table that’s at least eight inches tall and strong enough to hold a heavy book!

In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

In this math activity, learners observe and sketch cracking patterns in pavement.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this engineering activity, learners construct sturdy geodesic structures out of gumdrops and toothpicks. Use this activity to explore engineering principles as well as sturdy shapes and triangles.