Yesterday I was at work, and one benefit of my job is I can listen to music or anything I want while working. So I was bored with Pandora after 5 hours into my shift and started to look for some interesting videos about rocketry.
I found this and listened to it, and really learned a lot about hybrid motors. I do not plan on flying any in the near future, but it still helped me learn about rocket motors in general and I did learn about some physics principals.
-kyle.g