We have just completed the first week of trading the markets 21 hours per day. It was another extremely volatile week with prices staging a free-fall Tuesday and Wednesday paralleling steep losses across the rest of the world's commodity and financial markets. The wall of worry was getting higher this week as we still can't seem to understand that Greece is toast and we should move on to the next sovereign debt problem. Rather than trying to find a solution to Greece, we should instead learn from its mistakes lest we become the next object lesson. Oh, well.The 21-hour trading session didn't really seem to have much impact on trading. It just meant less sleep for those of us addicted to looking at the screen when markets are open. Trading...