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Where are the old physics videos?

So I was watching a few videos in the Physics Library, when I saw that some videos seemed older. They did not seem in continuation, so where are the ones which are missing? Sure, the old videos hav...

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Watching Videos in Faster Playback speed

So I thought that watching videos from Khan Academy in a faster Playback speed would be better as it will let you study faster. I already have experience with this as I watch Anime in between 3 - 4...

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