C411 Attack from Afar and Attack from Close Quarters

For example, gunpowder, papermaking, and printing. These were three of the four great inventions in his previous life.

As for the compass, because there were cultivators in the prehistoric world, it did not have much use. Ye Fann simply filtered it out.

Other than that, Ye Fann also passed the art of arithmetic to Ying Zheng.

When the art of arithmetic was developed