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We use these videos a lot in AP Bio and they've been incredibly helpful in understanding human processes and other areas of biology, as well as a little bit of chemistry. They are simple enough for anyone to understand, as long as they watch the correct videos first, but covers so many subjects that it's incredibly helpful for either a wide-spectrum or specific study.

This is a video that shows you how to replace the pull cord on a snowmobile. the guy has a funny voice but it helped me fix my pull cord and recoile.