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Measure the Sun's Size
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In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

Counting With Quadrants
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Millions of organisms can live in and around a body of water.

Clear Water, Murky Water
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How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?

Globe at Night
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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.