CREDITS Artist and Designer: William Pitzer, PitzoGraphics, Inc. Text Editor: Peter Winkler Developer:  The LightBeam Group Glen Hoptman, Publisher Hershel Kleinberg (Amber Wave Productions), Coding and Graphic Production Researcher: Melanie Patt-Corner Main | What Are Polymers? | In Nature | At Home | Recycling Parents and Educators | Credits | Geography Education   © 1997 National Geographic Society. All rights reserved.