My head is hurting...I'm as to whether it's because of:

1. The Angove's Stonegate that I've just finished, from which Mrs QF WP only got to drink 1 glass, or
2. The sheer complexity of the calculations that NM just shared with us (yes, he lost me about a third of the way through, so I stopped to finish the said bottle - did you pick that I did accounting and economics, not physics and chemistry ), or
3. Just how far off-topic this discussion has become (and no moderator to nudge you back on track)

Well, enough said. I'm off to bed now ^