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This activity is a hit for family events and all ages—some will finish in 45 minutes; others can go on for hours.

In this activity, learners use crayons to draw conclusions about rocks and the rock cycle.

In this activity, learners make balloon models of disease-causing bacteria.

In this activity, learners explore the relative sizes and distances of objects in the solar system.

In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.

In this activity, learners build scaled-down structures and cantilevers in a series of "building out" challenges with bamboo skewers and tape.

In this activity, learners build a mini dancing robot. This engineering activity introduces learners to electricity, circuits, switches, conductivity, and motors.

In this activity, learners explore how engineers have improved roofing designs and materials in order to protect the contents of buildings.