TY - JOUR KW - pfc AU - Carl Wieman AU - W. Adams AU - K. Perkins BT - Science DA - 10/2008 DO - 10.1126/science.1161948 PY - 2008 SP - 682 EP - 683 T2 - Science TI - PHYSICS: PhET: Simulations That Enhance Learning VL - 322 ER -