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Jason Bordoff from the Center on Global Energy Policy at Columbia University discusses the dramatic fall in the price of oil and the consequences for economies around the globe. Rupert Wingfield Hayes visits the site of Tokyo's controversial centrepiece stadium for the 2020 Olympic Games, a building critics are describing as too big, too expensive and yet another white elephant the city does not need.

Ben Gilbert from technology website Engadget explains the phenomenon that is 'gamergate' and Alastair Leithead visits Las Vegas where chess is getting a makeover in the form of a million-dollar tournament. We are joined in our Singapore bureau by Asia Now president Simon Littlewood and at our studios in Washington, Shikha Dalmia from libertarian monthly Reason. Plus, Lucy Kellaway of the Financial Times on why unlimited holidays is a bad idea.