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In this outdoor activity, learners use only their senses to to find the extremes of several environmental variables or physical factors: wind, temperature, light, slope and moisture.

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

In this activity, learners build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon.

In this activity (3rd on the page), learners investigate circadian rhythms by examining how well people do with estimating time.