The U.S. edition of the Guardian invited student journalists from Marjory Stoneman Douglas High School in Parkland, Florida, to guest edit today’s issue. The articles are outstanding.

Most compelling is this one about the dilemma of teachers: Their training for an active shooter told them to lock the door and go into hiding. But for many, their hearts told them to open the door to save students who were trapped in the hallways. What would you do?