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Credits Page 3: Eric Long, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 13: Illustrations by Max-Karl Winkler Page 15: Eric Long, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 18: Eric Long, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 27: Rick Vargas, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 44: Eric Long, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 47: Reproduced with permission from National Science Resources Center, Washington, D.C. Page 65: Matt Smith/courtesy of National Science Resources Center, Washington, D.C. 222 Page 80: Rick Nlargas, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Page 92: Matt Smith/courtesy of National Science Resources Center, Washington, D.C. Page 102: Rick Nlargas, Smithsonian Institution/courtesy of National Science Resources Center, Washington, D.C. Pagesl04-105: Student work by Brandon Weiss and Luke Bostian/courtesy of National Science Resources Center, Washington, D.C. Page 106-107: Reproduced with permission from Reading the Environment, in Insights: An Elementary Hands-on Science Curriculum. Published by Education Development Center, Inc., Newton, MA 02160. Page 111: Student work by Faith Washington, Daniel Hall, and Lunden Letofsky/courtesy of National Science Resources Center, Washington,-D.C. Pagel12: Student work by Shaughn Bischoff, Alex Jaeger, Jenny Minnard, Margaret Pace, Emilee Schultz, and Julie Wilke

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Credits Page l 14: Reproduced with permission from Balancing and Weighing, in the Science and Technology for Children program, National Science Resources Center, Washington, D.C. Page 1 16: Reproduced with permission from Reading the Environment, in Insights: An Elementary Hands-on Science Curriculum. Published by Education Development Center, Inc., Newton, MA02160. Page l 15: Reproduced with permission from Water; in the Full Page 125: Matt Smith/courtesy of Option Science System curriculum National Science Resources Center, program. FOSS was developed at the Washington, D.C. Lawrence Hall of Science, University of California at Berkeley, and is distributed by Encyclopaedia Britannica Educational Corporation (EBEC), 310 South Michigan Ave., Chicago, IL 60604. Page l 28: Mark Davis/courtesy of National Science Resources Center, Washington, D.C. 223