Halloween 2014 Z and Natan Pit of Ultimate Darkness

From a channel Lumen includes in full: Mike Zamansky, a veteran CS teacher, runs long tutorial series on Emacs and Emacs Lisp plus Clojure and Advent of Code walk-throughs — patient, practical lessons from someone who has taught programming for decades.

A 10-minute video from Mike Zamansky's catalogue; the title names its topic.

Video by Mike Zamansky, played through YouTube's embedded player.