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Who covers the extra costs as flights are disrupted - and other practical questions answered.
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Prof Robin Shattock, head of Mucosal Infection and Immunity at Imperial College, answers viewers' questions.
More...November 27, 2020, 09:50 -
BBC readers' questions answered as Japan's Emperor Akihito stands down and Naruhito takes the throne.
More...May 1, 2019, 00:10 -
From impeachment proceedings to who listens in on a president's calls - your questions answered.
More...September 26, 2019, 17:00 -
The deputy chief medical officer answers a range of questions about Covid from young audience members.
More...July 29, 2021, 10:30 -
January 13, 2021, 10:30