Jim Cramer answers viewers' Twitter (TWTR) questions from the floor of the New York Stock Exchange. When one viewer asks how long the market is likely to dip if the Federal Reserve raises rates in September, Cramer explains that there are always market participants trying to make a lot of money who bet the wrong side and then fail. He predicts that when the Federal Reserve raises rates, markets will dip for a period of two to four weeks. Cramer tells another viewer looking for insight on 3M (MMM) that the stock does not get enough respect. He says 3M is a core holding in his Action Alerts PLUS charitable trust portfolio and he's looking to have a much bigger position. When it comes to GW Pharmaceuticals (GWPH), a stock he's championed for a long time, Cramer says unfortunately, if you haven't bought the stock already, he can't help you with it here. However, Cramer thinks Molina Healthcare (MOH) looks interesting. He adds his predictions that Anthem (ANTM) is going to buy Humana (HUM) and Cigna (CIG) will merge with Aetna (AET), and stresses that Molina is a winner. If you have a stock question you'd like answered by Jim Cramer, make sure to tweet it @jimcramer using #CramerQ.