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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution.

If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge?

In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid.