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In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

This lesson challenges groups of learners to design and construct a wind generator with the most electrical output.

In this activity on page 12 of the PDF (Rethinking the 3 R’s: It’s Easy to be Green), learners examine how recyclable materials are separated by various properties at recycling centers.

In this activity, learners simulate the separation techniques that materials recovery facilities (MRFs) use and then design their own series of recycling techniques.