The U.S. stock market plunged more than 900 points today, before recovering. At first glance, it would appear investors were nervous about Greece’s wobbly finances, but some observers wonder if Procter & Gamble’s stock had anything to do with the steep slide. Shares of P&G briefly fell 23% Thursday before cutting losses to just 2%. A P&G spokesperson said the company was looking into the sudden drop in its stock price. P&G hit an intraday low of $39.37, but ...