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In this activity, learners build bridges and cantilevers in a series of "building out" challenges with straws and pins.

In this activity, learners repeat patterns in two and three dimensions to create tessellations.

In this activity, learners investigate the relative growth of lengths, areas, and volumes as cylinders are scaled up.

In this activity, learners use rice grains to model the composition of the atmosphere of the Earth today and in 1880. Learners assemble the model while measuring percentages.

In this activity, learners conduct an oxidation experiment that turns old pennies bright and shiny. Learners soak 20 dull, dirty pennies in a bowl of salt and vinegar for five minutes.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.