From the page: "In a paper published in the latest issue of Nature magazine (â€The missing memristor foundâ€; May 1, 2008; vol no. 453; pp 80-83), researchers at Hewlett Packard Labs, U.S., report that the â€missing†fourth element of circuitry that Professor Leon Chua of the University of California in Berkeley predicted in 1971 is indeed realisable."