Wang Zhiyuan, a Ph. D. In materials science from C9 University, died suddenly after staying up late to write a thesis. He woke up and became a ninth-grade official in the 48th year of Wanli - promoted by the river, in charge of a section of the Yellow River embankment. He is so poor that he has to face the flood season of the Yellow River in three months. According to history, this section of the dam will collapse and he will lose his head.
The only plug-in: the mobile phone came with me when I traveled through time, and there was also a "scientific research assistance system". It's not a system for cultivating immortals, it's not a card drawing system - it's a "material formula verification system". He can virtually verify the recipe he conceived in his mind.
As a result, the man with a science background started hard-core scientific research in the Ming Dynasty: improving cement-solid dams, using physical principles to design new firearms, using chemical methods to purify gunpowder, using mathematics to optimize tax accounting, and using biology to improve crop categories...
"What kind of magic? This is called Fourier transform!"
"What evil method? This is the periodic table of elements!"
"What secret? Those are Newton's three laws!"
Starting from protecting your head, to protecting the Yellow River, to protecting the Ming Dynasty's borders, and then to - spreading the Ming Dynasty's technology tree to the sea of stars.