► As part of this week's Science special
issue on forensics, Lizzie Wade told the story of how José Torero, a world expert in the forensic science of fire
investigation, has
shed a
light on — or perhaps, added to the mystery of — «a crime that shocked the world: the disappearance of 43 students from the Ayotzinapa Normal School, a rural teacher's college near Tixtla, Guerrero,» in Mexico in September 2014.