The UN’s cultural and scientific agency, Unesco, has announced that the US plans to rejoin – and pay more than $600m (£477m) in back dues – after a decade-long dispute sparked by the organisation’s move to include Palestine as a member. US officials say the decision to return was motivated by concern that China is filling the gap left by Washington in Unesco policymaking, notably in setting standards for artificial intelligence and technology education around the world. The US deputy secretary of state for management and resources, Richard Verma, submitted a letter last week to the Unesco director general, Audrey…