The world of video was shot in surprising ways, and web environments to host it. If YouTube accounted for the main sprint (I think it receives more than 65000 new videos every day), many others have followed the path environments, in some cases specialized content. This is the case of TeacherTube, specializes in video teaching environment. Predominate videos in English, but can also be found in other languages, and sometimes very high realism, as in the case of four-stroke engine you can see below these lines.
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