US Treasurys slip as Yellen speech approaches By: CNBC.com News February 24, 2015 at 06:36 AM EST U.S. government debt prices slipped on Tuesday, ahead of Fed Chair Janet Yellen's Congress address, as investors speculate on when rates will rise. Read More >> Related Stocks: Boston Beer Company Comcast Corp First Solar Hewlett-Packard Newfield Exploration Toll Brothers Inc