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Piles of Paper: Estimate Paper Use
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  In this activity, learners keep track of how much paper the group uses in a week. Build awareness of paper waste, while strengthening measurement and estimation skills.
  
Recycle Your Own Paper!
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  In this activity (page 2 of PDF under GPS: Garbology Activity), learners will prepare sheets of homemade recycled paper from several different source pulps.
  
Soap-Film Interference Model: Get on our wavelength!
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  By making models of light waves with paper, learners can understand why different colors appear in bubbles.