Justin Rowlatt of the BBC talks about helium’s impact on the world, and what’s being done to conserve it. Wall Street bankers take a turn on the stand-up comedy stage. Cable TV has been losing subscribers to satellite and phone companies—not to mention a growing online video presence. How will merging Time Warner with another company affect the cable TV business? Social media art sales are breaking down the white walls of the traditional art gallery business model. Now that the rules for breaking a Senate filibuster have changed, what will be President Obama's first move?