A Military Doctor Traveled to the Northern Song Dynasty to Turn the Tide

Let's see how a military doctor with all-round talents in mathematics, physics and chemistry can turn the tide, save an era full of crises, and move towards glory. What method did he rely on? Naturally, it is an interdimensional scientific skill! Let's see how a military doctor uses modern knowledge to create an era of political enlightenment, social stability, economic prosperity, and cultural unification step by step! Each of us will have to travel through time in a hundred years. No matter whether we are poor or rich now, we should live more than just learning. What if we wear it out in the future?