thanks for all that wonderful information - I'm a beginner in the world of yoga - I used to think yoga was just Hatha yoga, asanas and the physical practice but as I started learning more I realized there is so much more! It is amazing to see yogis from so long ago having such insight and wisdom.. it baffles me how much knowledge the eastern world held long before the western world started trying to "scientifically" define everything. Funny how things are starting to match up, though!