Overview of Bootstrap 4 and its implications with respect to library vendor services
A few days ago I presented a live overview of Bootstrap 4 -- presently in beta -- for Novare Library Services, and I just got my hands on the recording. I spend about a half an hour doing show-and-tell, and then I take questions and otherwise muse about what it will mean for libraries if and when vendors that use Bootstrap ultimately upgrade. 

Hope you find it useful.