Hu Cao, the most insignificant figure in the Northern Song Dynasty, hid two secrets in joining the army: first, he came from a thousand years later, knew arithmetic, knew sea charts, and could build a steam engine; second, he had the "Tong Jian of All Industries" in his arms, which could turn craftsmen into capable ministers and teach his sons to be ministers.
Grain merchants stocking up on rice?
He asked the people in the market to hold up the "rice price notice board" written by him to block the grain store;
He took the litigant and spread the account book in front of Renzong.
When Tie Mianzhang wanted to attack him and the survivors of the Southern Tang Dynasty wanted to take his life, he patted the newly recruited reform team on the back: "When someone turns the Song Dynasty into the overlord of the sea, let's see who dares to say that Hucao joining the army is a sinecure!"
