Chapter 1177: National Debt Plan

uzzle and said, "Sweet potatoes can be planted twice a year, with good seasons. They can be harvested three times, with yields eight to nine times higher per mu than wheat!"And this thing, can be eate...elopment of gunpowder requires a large number of experiments, and the application for materials is afraid that it cannot avoid the eyes and ears of others..."Li Chen, who had already anticipated this,...