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In this math activity, learners experiment with the concept of symmetry.

How do you measure a bubble when it's floating? You can't really, but in this activity, learners can measure the diameter of the ring of suds a bubble leaves on a flat surface.

In this math activity, learners pretend there is a special store that lets you pay for toys by their weight in pennies.

This is a classic exercise for visualizing the scale of the Solar System.