The Wrong Way to Use Healing Magic - Chapter 15Vol 2.

Xiao Ming, a junior in high school, experienced the whole life of a high-tech planet Pan Shaxing science and technology warrior after staying up late to watch a novel suddenly die.

Xiao Ming, who was dying to death, found that science courses have become simpler. In addition, he also has Pan Shaxing’s technology system.

At the juncture of the college entrance examination, he started a different life.
From sewage treatment technology to domestic operating system;
From neuron chip to anti-gravity technology;
From DNA repair shop to conscious upload server;
Every black technology that changed lives came into being.
I appeared on the cover of “Time” and asked for the front page of “Forbes”.

“Forbes”: “This man has a monopoly on the world, we can no longer calculate his value …”
Technology creates the future, Xiao Ming should be the future guide.

Xiao Xiaoming: “I’m sorry, I seem to have skewed the human tree of science and technology.”

- Description from Qidian

In a cultivation capital where Beast Tamers command tigers to swallow the sky.There exists a tiny and usually empty shop, yet it contains secrets that would drive the entire Grand Xia Empire into a frenzy.Here, you will find a bouncing Hydro Slime sold for one hundred Spirit Stones!Here, you will see a Magma Core variant priced at ten True Essence Crystals!Here, while others chant ancient mantras, the owner uses high-tech bio-labs, gene-splicing, and molecular incubators to breed god-tier monsters.He is a sarcastic gamer from Earth who just wants to sleep in the sun, but he accidentally became the only supplier of dimensional beasts in the multiverse!“Holy shit! A Basic Slime costs a hundred Spirit Stones?!”The shopkeeper’s eyes light up. Finally, the first victim has arrived.

300 years after becoming a Demon King, the war angel Ansel faced a serious problem during a certain expedition.

——His halo grew out once again.

Ansel picked an auspicious place that was definitely and absolutely unmanned, and while cursing, he simply and skillfully broke off the newly emerged angelic aperture.

This thing was growing out faster and faster!

When will his undercover mission end already?!

The demon realm was divided and ruled by three kings. Demon King Saros was forced to go on an expedition with his sworn enemy, Ansel.

One day, he noticed Ansel sneaking away from everyone.

Saros decisively followed him, and was shocked to find that his sworn enemy, another demon king of the demon realm, took off a horn headband and fake bat wings. As Ansel cursed up and down, Saros watched as he skillfully removed a cute halo from his head.

This irritable, easily angered guy who loves fighting; the type that was cute when he shuts up but could make even demons angered to the point of ascending to heaven the moment he opens his mouth…

..was actually an angel???

- Description from Novelupdates

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.