New editing policy:

As the sources of videos embedded keep expanding while there's no help around for the workloads, I have to change the editing policy for the time being. Since the embedding priority of this site is on semester lecture series, it definitely saves me some time if I only have to post one monthly list for most youtube channels. It's not ideal though as putting monthly videos on one single post will make the labelling/classifying job too difficult to carry out and thus very incomplete; nevertheless, I have to make this adjustment to ensure I have enough time to carry on embedding semester lecture series. I'll try to make sure most semester lecture series have appropriate and enough labels to help most viewers facilitate their search and learning here. If I have some extra free time, I might make time to embed and label individual videos that are directly or closely related to academic learning. No guarantee though.