America's $40tn debt: Your questions answered

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The Congressional Budget Office (CBO) said the US was nearing its $41.1tn debt ceiling, with debt projected to climb to about $64tn by 2036. Our business reporter in New York answers audience questions. A new personalised vaccine given in combination with a drug has stopped skin cancer returning in patients during a trial, representing a potentially watershed moment in cancer treatment. Our global health correspondent explains. Prince Harry and his wife Meghan are planning to move back to Britain. We get more information from our reporter. Sea ice has been disappearing from East Greenland, allowing giant whales to take advantage and move into previously inaccessible areas. We speak to three people who track whales. Lions and tigers that spent years living in cramped cages at a controversial Argentine zoo have arrived at their new homes in South Africa and the US. We speak to three people involved in the rescue operation. Presenter: James Reynolds. (Photo: U.S. dollar bills are seen on a light table at the Bureau of Engraving and Printing in Washington, November 14, 2014. Credit: Gary Cameron/Reuters)