Stable Marriage Problem
Discuss on Reddit: http://redd.it/2fgu97
Featuring Dr Emily Riehl. Continues with the more mathematical bit at: http://youtu.be/LtTV6rIxhdo
The Gale/Shapley paper: http://bit.ly/StableMarriage
Animation and artwork by Pete McPartlan.
(But the bad bits of animation were by Brady)