The S&P 500 (^GSPC) suffered its steepest slide since mid-November amid signs the Fed is finally growing uneasy about its policy of easy money. Homebuilders slumped so Elvis was shrewd to have left the building but Mr. Costello may want to rethink his aversion to going to Chelsea after Chelsea Therapeutics (CHTP) surged 153.90% to top the Nasdaq (^IXIC).   The world waited on every word from a blonde with a raspy voice. But enough about Scarlett Johansson for it was Marissa Mayer who unveiled a new homepage for Yahoo (YHOO). It still wasn’t enough to stop the stock falling 1.74% but the Silicon Valley CEO has undeniably ...