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Mirrors and Images
Source Institutions
In this optics activity, learners explore how many objects they can see in a set of mirrors (hinged like a book) at various angles.
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The Shadow Knows II
Source Institutions
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.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-382.jpg?itok=V2hkSpDn)
Auditory Acuity
Source Institutions
This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-636.gif?itok=nNdYFj4l)
Simple Pop-Up Mechanisms
Source Institutions
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.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-749.jpg?itok=rhy4oU9I)
Angles and Area
Source Institutions
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.