Chapter 486: Thorough Investigation

peaking of which, Li Chen pointed to the Royal Academy of Learning, which was right before their eyes, and laughed loudly: “This is where this palace truly laid the foundation for the eternal prosperi...strong. Otherwise, it would not have been suppressed by the Liao and Jin states militarily for a long time.Therefore, before that, saltpeter was mostly used by civilians to make gunpowder, fireworks,...