. . "Changing shape" . "Changing shape"@en . . . . "Shows how certain materials, such as clay, balloons, and paper, can change shape under the influence of other pressures, and how some can return to their original shapes." . . . . . . . "Cambiar de forma" . . "Explains in simple language how applying force to different materials can make them change shape." . "Juvenile works" . . . . . . "Fuerza y energĂ­a Literatura juvenil." . .