It’s the big mystery of the day in the media world: Up to now, Rupert Murdoch scoffed at the thought of breaking News Corp into two pieces — a fast-growth film and TV entertainment entity, and a slow-growth print one. He wanted to protect his newspapers, traditionally the source of his political power. And it’s his company. Yet today News Corp confirmed a Wall Street Journal report that it’s considering a split. So, what changed? You’d have to perform a Vulcan mind-meld with Murdoch to find the real answer, unless he decides to tweet it. But I have two theories: He’s more nervous than he lets on about the possibility that News Corp will have to defend itself against charges that it violated the Foreign Corrupt Practices Act (FCPA). And he wants to get back into doing what he loves: buying and selling stuff.