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Campaigning for a coming election in the world\u2019s fourth-most-populous country has been almost entirely policy-free: a good social-media presence is nearly all candidates need. As the Panama Canal dries out, neighbouring countries spy an opportunity\u2014but how much of that trade can they expect to siphon off (09:11)? And, the wild boar hybrids causing havoc on Canada\u2019s prairies (15:56). 

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