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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

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

Are fingers the only place on the body where we use our sense of touch? In this activity (6th activity on the page), learners test the touch sensitivity of different parts of the body.

In this activity (11th activity on the page), learners use pennies to test their hearing acuity.