I have read most of it although the beginning about how the earth makes  
minerals and how it is tested is a little bit past my range. I got the dire 
gist  
of that part though. Great book, Let's play doctor is also in my library which 
I  think is great. My family is in his associate program for American 
Longevity  recently and find it to be very interesting and had good results 
with some 
 diabetic trouble although we're still into many therapies.