TubeChop is handy for eliminating parts of a video you do not want and to select only portions to show.
An alternative is SnipSnip.It.
To ask questions while the video is playing you can use VideoANT.
Blog Smith is inspired by the myth of Hephaestus in the creation of blacksmith-like, forged materials: ideas. This blog analyzes topics that interest me: IT, politics, technology, history, education, music, and the history of religions.