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Traffic Light with paper clip switch.  Move paper clip to copper line on far left to light up red.

Note: Launch as shown in inset; remember to keep eyes, heads, Waterford crystal, etc. out of rocket's pathway. Shown in photo Size 18 (3" x 3/16") rubber band 1/8" holes in 3 ounce plastic cup Reference "How to Make Jumping Cups" by Kristen Sutcliffe bkids.typepad.com/intro/2009/09/craft-project.html