MTL - Science and Technology Library - ~ End of this testimonial

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Upon entering the world of Genshin Impact, Lucas unexpectedly activates the “Villain Simulator,” forcing him to take on the role of a major antagonist in a simulated reality. His missions include:Bullying Keqing at schoolBlackmailing Shenhe into carrying out various tasksRaising an army of undead to destroy MondstadtAnd much more...To balance the evil acts committed in the simulation, Lucas must earn good karma by acting virtuously in the real world. However, he never imagined that one day, Shenhe, wielding a spear, would confront him in reality:“Lucas, you have committed countless evil deeds. Today, I will kill you to uphold justice!”Lucas: “...Wait, weren’t those just fake simulations?”

[full text overhead]

Gu Muran, the former master of metaphysics, woke up and found that he had become the fake daughter of the Gu family.

The Gu family couldn’t bear the thought of their own daughter marrying into the Qian family, so they thought of the adopted daughter they had abandoned before.

The daughter of the Gu family had a physical problem. The Gu family believed that it was because of her adopted daughter’s fate that her daughter was hurt.

The parents put their ideas on her again: “Since you and your sister’s kidneys are well matched, then give her one of yours, and she won’t die anyway.”

Gu Muran: Auntie’s things are not something anyone can touch easily.

In her previous life, her power of metaphysics was unrivaled in the world. She was once appointed as a national teacher to protect the common people of a country, and she was heard by the heavens. Even the emperor had to respect her when seeing her.

How could she allow these messy people to jump around in front of her.

…

He is a revered god of medicine, with superb medical skills, it is difficult for a thousand dollars to make an appointment to seek medical consultation.

No one knows the depth of her talent for magical calculations. She knows the destiny with one glance, and predicts fortune and evil with one word.

later……

People: “Have you heard that there is a magician in Tianqiao?”

Classmate: “Who said that, our school is really good at it.”

Rich circle: “You are talking nonsense, the real magician is here.”

God of Medicine: “Hold on to dissatisfaction, Mrs. Lu is the most powerful.”

A certain woman smiled faintly: “Low-key, low-key, don’t fight, don’t grab, it’s all me.”

- Description from novelbuddy