We are glad to hear of your interest in our work. Please try to learn as much as you can from our publications, our web site, and the other sites to which our site links before requesting personal help. When you finally do have questions that aren't answered by our papers, it helps us if you tell us how much you already know about the subject and what you have already done to find the answers you seek. That is the most educational way to do research for school, and it helps us to write answers at your educational level.