Page 2: Courtesy of Brian Atwater and Mary Lou Zoback, U.S. Geological Survey.
Page 4: Image of article reprinted by permission from Nature 378:371-372. Copyright 1995 Macmillan Magazines Ltd.
Page 9: Letter written by student, Janney Elementary School, Washington, DC.
Page 12: Student and teacher at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 15: Probably Tuskegee Institute. From the Library of Congress Photo Collections.
Page 16: From the Library of Congress Photo Collections.
Page 17: From the Library of Congress Photo Collections.
Page 24: Courtesy of Lawrence Hall of Science, University of California, Berkeley.
Page 28: Students working on an activity from Floating and Sinking, a fifth-grade STC unit. Courtesy of the NSRC.
Page 30: Courtesy of the Lawrence Hall of Science, University of California, Berkeley.
Page 31: Student at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 32: Students at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 38: Students at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 38: Student at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 38: Students at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 40: Courtesy of BSCS.
Page 42: Courtesy of BSCS.
Page 43: Student at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 45: Students at Glebe Elementary School, Arlington, VA, work on an activity from Organisms, a first-grade STC unit. Courtesy of the NSRC.
Page 49: Illustration by National Academy Press.
Page 51: Courtesy of BSCS.
Page 52: Students at Chevy Chase Elementary School, Chevy Chase, MD. David Savage, photographer. Courtesy of the NSRC.
Page 53: Moon phase photos courtesy of BSCS.
Page 55: Student at Eastern Middle School, Silver Spring, MD. Robert Allen Strawn, photographer.
Page 56: Image of the Copernican model of the universe. Reproduced from the Collections of the Library of Congress.
Page 57: Page from Galileo’s “Starry Messenger.” Reproduced from the Collections of the Library of Congress.
Page 62: Sketch drawn by student at Woodrow Wilson Senior High School, Washington, DC.
Page 73: Students at Edmund Burke School, Washington, DC. Danyelle Miller-Coe, photographer.
Page 74: Worksheet from students at Edmund Burke School, Washington, DC.