Watching the video I had a rough idea of how copiers worked in the modern era with sensors that sense the image and convert it into a file which it can then print multiple times. This was completely different to how photocopiers actually ran in the past which was very interesting to me. The way that one would photocopy something in the past would use a fine layer of powder deposited onto the piece of paper through a series of electrode wires and rollers. The paper would then run past a heater which would melt the toner onto the paper resulting in the final product. While watching him describe this process, the fact that papers came out warm from printers made so much more sense. The complex mechanical processes behind these printers was also very interesting to look at and learn about. I never realized how mechanically intensive the printing process used to be up until very recently. Finally, I thought the process of using electrons to transfer the negative an image was very interesting because it made for some movie magic like videos. For instance, when he would transfer the image onto the selenium, there would be nothing visible until he poured the powder on top and only where the charge remained would the powder stick. I thought this process was very cool.