Class is in session.  Dr. Mark talks about

Cadence: what is the most efficient, how to determine yours, does it make a difference if you are tall or short?
Breathing: what is the most effective way to breath?  How to practice and what are the benefits?
How long does it take to change body composition?
Treadmills
What are the latest trends in running shoes that he saw at 2013 The Running Event

Here are some valuable links:

Dr. Mark's video on the "Natural Running Principles" 
Natural Running Center
The self propelled treadmill: Samsara Fitness' Trueform Running University
Healthy Running
Two Rivers Treads running store
Dan Lieberman's new book, "The Story of the Human Body"

Take the Tailwind Challenge at: Tailwind Nutrition   
Check out the cool headlamps made for trail running at Petzl
Download a free audio book at Audible