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US President Donald Trump and China's President Xi Jinping have exchanged warm words at a lavish White House state dinner but gave little indication of progress on pressing issues. Xi stressed that they should ensure artificial intelligence remains "under human control", while Trump toasted a future of "harmony, peace and success" for both nations.Also in the programme: As the Tigrayans go on the offensive in Ethiopia, where is that conflict headed? And a new test for brain tumours that can slash diagnosis time to just two hours.(Photo: Presidents Xi and Trump in Washington DC. Credit: Reuters)
