We have known and appreciated Marcus as a talented sailor as well as "just a really nice guy" since he was a relatively "little boy" on a "big Arrow" WOUTER, and I do agree with you that "mathematics don't lie". The only problem that I do have with maths is not in the maths itself, but not knowing the person who is applying the maths and the biggest problem of all, that of taking into consideration all the variables associated with any particular formulation. As you are aware, the result of the application of a beautiful formula is rubbish if only one small variable is not taken into the consideration of the whole. (Then again theories are just that unless they stand up to the proof)