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versity on how to use the different phases (amorphous or crystalline) of a glass-like material (chalcogenide) to store "1" or "0" for computer memory; it is called the phase change memory (PCM.) Besides the dissertation I also made a 16 mm movie on the mechanism of phase change memory (PCM.) at that time. In the early 70's I did work in the characterization of PCM. Then I joined the management rank of Corporate America. Recently I was awaken by an article in Science that described chalcogenide PCM has the potential for major applications in non-volatile memory and it became a hot subject in the semiconductor and PC industries. This motivated me to show our old movie to few PCM researchers at Cambridge University and at the Chinese Academy of Science and they commented that our 1969 movie still has remnant value in contributing to the understanding of the switching mechanism of PCM, even in 2012. Therefore, I would like to share this study with you here. I would like to thank my granddaughter, Isabella Havas, who helped me to convert the original 16 mm movie into the digital format and put the whole thing together on youtube for me. PCM is still in the very early stage of its commercialization. But Samsung has incorporated PCM into one of its smartphones and they also have announced plan to market a 8 GB PCM module. Hope you will enjoy this video. Charlie Sie ([email protected])