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Professor John Endler traveled to Trinidad in the 1970s to study wild guppies. In this activity, learners take part in an online simulation of Endler's work.

In this physics activity (page 4 of the PDF), learners will explore how similar magnetic poles repel one another. They will rely on linear induction to race magnets around a simple course.

In this optics activity, learners conduct an experiment to find out why two eyes are better than one!

These two activities (4th on the page) demonstrate the importance of two eyes in judging depth.