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In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

In this data collection and analysis activity, learners evaluate fish physiology and ecology using vision research data from Dr.

In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.