yeah, I noticed "Ann Arbor" and thought, "hmm...Brian's neck of the woods...". (From his site) I didn't realize (famed luthier) Dan Erlewine was also from the area.
re: the intonation vid, the other companion videos are eludicating and informative to watch as well:
(Temperament for Fretted Instruments)
https://www.youtube.com/watch?v=ERF1Kk5kcR8and
(Gibson and Martin Scale Lengths Explained)
https://www.youtube.com/watch?v=0yCLckbp8ps(actually I thought all of them were interesting) :
https://www.youtube.com/user/A2Guitars/videos