One of my students pointed out, then the rest of the students went "oh yeah" that when explaining a new task or concept I move my hands a lot while talking. I did try to stop which was harder than I thought it would be but then I had a student ask me to go back to moving around as they found it helpful.

Couldn't work out how to highlight or annotate video. The accent takes a little getting used to although subtitles helps. The video is helpful in getting your head around the different concepts and finally there is a practical use for differential calculus and Euclidean distance.