Germanwings 'deliberate' crash prompts security questions

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French prosecutors say the co-pilot on Germanwings flight 9525 appeared to want to "destroy the plane", so what are the implications for security in the airline industry following the tragedy in the French Alps? We ask Mike Vivian, a former British Airways pilot who helped the UK Civil Aviation Authority revise procedures following the 9/11 terror attacks. Oil prices jump and market shares trade lower after a coalition led by Saudi Arabia launches air strikes in Yemen against Shia Houthi rebels. Twitter joins the live video streaming race, taking on Meerkat - the BBC's technology correspondent Rory Cellan-Jones tells us why the battle is being so fiercely fought. We hear how a lack of electricity is short-circuiting the ambitions of entrepreneurs in the west African nation of Ghana. And our regular commentator, Irwin Stelzer, of the Hudson Institute in Washington, talks us through the impact of so-called 'disruptive technologies'.