Tens of thousands of LAUSD employees, including teachers, are set to strike from Tuesday to Thursday, likely shutting down the nation's second-largest school system. The strike is a result of stalled contract negotiations between the SEIU and the district, with the union demanding a 6.5% pay raise, smaller class sizes, and more support staff. The district has offered a 6% raise, but the union has rejected it, and it is unclear how long the strike will last.