The WGBH store has many different subjects. For all grads from K-12. some of the subjects include Engineering, life science, Arts, and many more. the videos are broken in to different grads and the subject that they cover. they also have a section with free public lectures.
The video that I watched was about trebuchet and some of the engineering principles of them. the video talks about a person who is designing and building one. it talks about early desires and some of the problems that he ran in to. It also talked about how the addition of wheels would fix the major problem. I thought that it was a very interesting video.
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