NAEYC item #352--T.p. verso. Includes bibliographical references (p. 100-102) and index. Can I have your shovel? -- Ramps materials -- Thinking about children's thinking (or, why we take a "constructivist" approach) -- Doing constructivist physical science -- Mental relationships children can construct -- Ten principles of teaching : working with children in Ramps & Pathways activities -- The story of Nani (or, a case where Ramps & Pathways made a difference). Provides an introduction to constructivist physics with classroom examples illustrating how children construct knowledge. Shows how to promote children's scientific reasoning by engaging them in active experimentation.