General Comments Commodities opened 2012 trading with an impressive rally that included grains and the soy complex. The rally was sponsored by a number of factors. The euro surged as Germany reported the lowest unemployment in 20 years, and the dollar fell, which helped prices of dollar-denominated commodities. There was some impressive economic news from the U.S. in the form of strong increases in manufacturing and construction. Chinese manufacturing activity in December showed a slight increase over November, thus raising hopes that the Chinese economy was not slowing -- at least not as much as feared. And it is the New Year, which is apparently attracting some return of investment money to commodities.The rally was quite broad based...