Thanks, Gavin, these are only for light reading b4 I go to bed. I read thru Pathways of the pulp last year when we had an initial endo course. I was not very impressed with it. I don't know Dr. Cohen, but never heard a good thing about him. One more thing, I ask my friend @ UOP (who just graduated 2wks ago), and she doesn't even know who Cohen is. 😴