Okay, thanks Duane.
I'll go to Professor Bull for a quick second here.
Again, going back to my earlier comment about not necessarily understanding all the little things that you threw out when you were speaking, you talked about biological solutions versus engineered solutions. Could you just expand a little on what you meant when you were comparing the two and which one was better for certain things? I wrote that down when you said it and I didn't really understand the context.