Earlier this year I wrote this article on the 13 Ghost Points of of Sun Si Miao. If you are interested in learning more about this more obscure aspect of Acupucture treatment follow this link here and scroll down to the video at the bottom of the page. Also I will warn you the sound quality is really bad intitally during the introduction once you get to 3:17 where the actual lecture starts the sound quailty improves significantly.