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• US shutdown: Trump delays State of the Union address
  The president concedes he cannot give his State of the Union speech until the funding row is over.
• Venezuela crisis: Maduro cuts ties after US recognises opposition leader
  The US has recognised Juan Guaidó as Venezuela's interim president and urged the army to back him.
• UK team drills deep Antarctic hole
  UK scientists have succeeded in cutting a 2km hole through the West Antarctic Ice Sheet.