Demonstrators hold signs while marching during a teachers strike in Los Angeles, California, on 14 January 2019. Tens of thousands of teachers in Los Angeles walked off the job after months of negotiations between their union and the second-largest US school district failed to resolve long-simmering disputes over pay raises, class sizes, inadequate support staffing and public funding for charter schoolsPhotograph: Scott Heins/Bloomberg via Getty Images

Source: The Guardian December 29, 2019 19:52 UTC