U.S. Markets Open Higher; Mannkind, PPG Industries In Focus

It's the last trading day for the first half of 2014 as stocks head into a shortened trading week. Mannkind (MNKD) is getting a boast after the company received F-D-A approval for its inhalable diabetes treatment. Shares for the stock was up 12 percent in pre-market trading. PPG Industries is also moving higher after announcing to buy Mexico's Comex for $2.3 billion. The transaction is expected to take four to six months to complete. The paint and coatings maker is hoping the deal will boost its presence in Mexico and Central America. And Facebook is not getting liked this morning about news the social media network manipulated nearly 700,000 user news feeds as an experiment.