"Ciencia recreativa." . . . "How things work"@en . . . . "Cómo funciona" . . . . . . . . . . . . . . "Projects, activities, and experiments explore such areas of technology as the wheel, rocket power, kite-flying, and magnetism."@en . "Projects, activities, and experiments explore such areas of technology as the wheel, rocket power, kite-flying, and magnetism." . . . "Juvenile works"@en . "Juvenile works" . . . . . "How things work" . . . "Technología." . .