“Distance answer! 40,39,38.” At 1428 p.m. on 6 May, the soundings of the penultimate stadium were transmitted from the “bush” early warning of the earthquake in eight ADF primary schools in the town of Choonton, Gansu County. At the same time, more than 17,000 teachers and students from 29 primary and secondary schools in the county were evacuated urgently after early warning, and all teachers and students who arrived before the devastating “seismic wave” were transferred to the security zone...