Strange News from the Ministry of Industry: Starting from a Screw

I traveled across time with a head full of physical formulas and engineering drawings, and became a refugee starving to death on the roadside. The first thing I did when I opened my eyes was to make a simple mouse trap using branches and rags. The second thing is to triple the efficiency of the county water tanker. The third thing was to use Bernoulli's equation in the court to render Qin Tian Jianzheng speechless. The emperor slapped the case and stood up: "This kid is deceiving the public with his evil words, drag him out——" "——Wait a minute," the old prime minister tremblingly held up the drawing I presented last night, "Your Majesty, if this thing is completed, the floods in the Yellow River can be quelled." The Minister of Works sneered: "Exotic skills and obscene skills." Three months later, the eight-hundred-mile border crossing was expedited. The enemy's cavalry retreated three hundred miles, and there was only one line in the emergency report: "They... They can fly