Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world. Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world. If you run a hedge fund that loses 20 percent in a year, you have an obligation to be interesting in your annual investor letter, and Bill Ackman's Pershing Square letter for 2015 is quite interesting. Though the how-did-we-lose-all-that-money stuff -- which you might expect would be...