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Workers at Brazil's state-owned oil company, Petrobas, down tools over pay and plans to auction a huge offshore oilfield to foreign bidders. The Dr Martens footwear brand is at the centre of a $500m private equity deal - we take a look at a brand that has for years been a symbol of successive waves of youthful rebellion. We talk to the brains behind a shocking stunt to promote a new film by scaring members of the public at a New York cafe, and we visit an art fair to find out how attractive an investment it is.