Australia’s borders will remain closed for another two weeks for hundreds of thousands of overseas students, migrant workers and refugees, Twitter has announced that its co-founder Jack Dorsey has stepped down as chief executive,  Australian actor David Gulpilil has died aged 68,  Barbados will officially become a republic this week when it replaces the Queen as its head of state, Elton John and Ed Sheeran have teamed up for a new Christmas song, Mariah Carey’s interview on The Project got off to an awkward start last night.