Stranger's Handbook - Chapter 87: Congratulatory Gifts for the Pregnancy

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.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

Song Yuan accidentally picked up a 5-year-old child.

The child has bright eyes, chiseled features, and prideful demeanor. He referred to himself as “this prince” and his mannerism was wild, cool, and stuck up.

“This prince will never eat such lowly food!”

“How dare you flirt with other men behind the back of my imperial father?”

“He insulted this prince and you sided with him? This prince will sentence his entire clan to death!”

Song Yuan was very disturbed. The DNA test had confirmed that the child was, indeed, her son, but why did he act like he was delusional?

More importantly, who was the father of the child?

The prince was going mad from worrying; Imperial Father, if you don’t come soon, Imperial Mother is really going to cheat on you!

- Description from Novelupdates

Lin SuCi transmigrated into a book, and became a kitten who had just cultivated into becoming human.

When he was still young, he was picked up by a good man to be become his apprentice, but he did not expect his master to let his senior — the number one villain in the book — raise him?

This villain senior was too scary, when he had nothing to do he would put him on a plate and stare at him. Let’s not mention cuddling, embracing, stroking and pinching him all day long, he even had a hundred ways to bite a cat!

Lin SuCi covered his butt and had a tearful epiphany, Senior wants to eat me up!

Having tried to run away with his short legs and getting caught for the nth time, Lin SuCi, his paws covering his face, had to accept his fate.

Wasn’t it to just be the boss villain’s favored younger brother? Take your hand off my tail, fine, I’ll take on this role!

- Description from Novelupdates