Stocks were mostly flat at Wednesday's Opening Bell as traders kept a close eye on the U.S. dollar. Durable goods orders in February dropped 1.4%, likely weighed by the strong dollar and weak global demand. Economist were expecting a modest pick-up of 0.2%. Shares of Kraft (KRFT) spiked in early trading on news it will merge with Heinz (HNZ). The combined company will form ‘Kraft Heinz’ with Heinz shareholders owning 51% and Kraft shareholders owning 49%. The deal is in part financed by Warren Buffett’s Berkshire Hathaway. Facebook’s (FB) annual developer conference kicks off today. This will be the first time the F8 conference runs for two days, instead of just one. CEO Mark Zuckerberg is expected to hit the stage at 1 pm.