Double Slit Mystery
Via A, this is a really good and entertaining video illustrating the Double Slit Experiment. It's an animated segment of a larger film on quantum physics and discusses both the role of the double slit experiment in establishing wave-particle duality and introduces the impact of the act of observation on what is being observed. Recommended for either physics fans for the entertainment factor or for anyone who wants a low-impact way to learn a little bit about quantum physics.