A science and engineering man traveled to a poor family in ancient times, and got a young and beautiful wife for free.

What should he do if his family is too poor?

He made soap with lard and plant ash, made a homemade pressure cooker to distill liquor and sold it at a high price, and used a waterwheel to turn the spinning wheel.

He made a lot of money.

Once the ironmaking technology was improved, fame and fortune came to him,