Robert Karplus a professor of physics at the University of California Berkeley USA became a leader in the movement to reform elementary school science in the 1960s. This book selects the enduring aspects of his work and presents them for the scientists and science educators of today. In an era when `science education for ALL students has become the clarion call the insights and works of Robert Karplus are as relevant now as they were in the 1960s 70s and 80s. This book tries to capture the essence of his life and work and presents selections of his published articles in a helpful context.