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Mirrors and Images
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In this optics activity, learners explore how many objects they can see in a set of mirrors (hinged like a book) at various angles.

The Shadow Knows II
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In this activity, learners will measure the length of a shadow and use the distance from the equator to calculate the circumference of the earth.

Auditory Acuity
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This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.

Simple Pop-Up Mechanisms
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In this activity, learners construct three quick and simple mechanisms to start building a pop-up book. Learners fold, cut, and glue paper to make a bird beak, parallelogram, and V-fold.

Angles and Area
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In this activity (page 10 of PDF), learners approximate the area of the uppermost cross section of an impact crater using a variety of square grids.