Introduction to people in the disaster: Because the volcanic ash that wrapped the corpse solidified into a hard shell, and after the human body rotted, a human-shaped volcanic ash shell was formed. Fiorelli invented the "gypsum casting method" , pour plaster of paris into the shell, solidify and remove the volcanic ash wrapped outside, and a lifelike human body will appear, thus reproducing the various tragic scenes of the victims before their death: some holding their heads in their hands, curling up They were sitting in a group in pain; there was a slave who was chained by his master and could not break free when disaster struck, so he had to sit and wait for death; the most admirable thing was an ordinary soldier who stayed by the city gate until the lava and The fire engulfed him, but his expression remained calm and calm.