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Nasa says it has successfully flown a helicopter on Mars - the first powered, controlled flight by an aircraft on another world
More than three million people have died with coronavirus worldwide, according to data from Johns Hopkins University
Chad's President Idriss Deby killed in clashes with northern rebels shortly after winning re-election, army says
UK Prime Minister Boris Johnson tests positive for coronavirus and is experiencing mild symptoms, says No 10
Physicist Stephen Hawking has died at the age of 76, a spokesman for his family has said
Coronavirus vaccine developed by Oxford University appears safe and trains the immune system, key early trials show