Shares of Herbalife opened higher this morning after billionaire investor Carl Icahn revealed a huge stake in Herbalife yesterday evening equal to 12.98%, or 14,015,151 shares. Herbalife is the stock that Icahn's decade-long rival Bill Ackman, the CEO of Pershing Square Capital Management, is shorting.  Ackman, who believes the company is a pyramid scheme, is shorting 20 million shares of Herbalife with a price target of $0.  The two hedge fund titans recently brawled in a telephone interview live on CNBC with Icahn hurling zingers a Ackman calling him a "crybaby in the ... Read More