HP: The Arcane Thief - Chapter 7: The Golden Quintet?

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.

Chen Lin traveled through the martial arts world and found that he actually had a clone, but…

“Why is my clone in the world of immortality?”

“Forget it, you can continue to practice martial arts. I am going to start cultivating immortality. I will meet you all again in a thousand years!”

…

Over the course of thousands of years, there will always be geniuses born from the sky, whose fame is as mighty as the sun, sweeping across the universe.

But no matter how heroic the Martial Emperor is, when they burn out the emperor’s blood and exhaust their souls, they finally break through the world of mortals with their withered and broken bodies, penetrate the layers of divine patterns and talisman formations, and see the figure standing at the end. …

The person who stands on the twelve-level lotus platform, wears the Mountains and Rivers Sheji Diagram, holds the Jade Order of Creation in his left hand, hangs the Four Swords of Killing Immortals in his right hand, and hangs the shadow of the Tai Chi Diagram behind him, will always turn around.

He smiled cheerfully and said to them:

“Coming?”

[Liu Jieliu] [Fu Dao] [Orion] [Martial Arts] [Clone]

- Description from novelbuddy

“Ah…” She is so tickled that she is defenseless against his attacks. “You can choose to marry me or to die!” By then you will become the first person in history to die from tickling. “If you dare to reject me, I will make sure to ravish you until you yield to me.”

Yin Yin is the new bedside mother-in-law who specializes in protecting the safe and healthy growth of children in the world. However, she found that more and more parents do not pay attention to their children’s growth, which leads to the original innocence and cuteness A child’s life is miserable.

Yin Yin decided to go down to earth to become the mother of the children and protect the happy lives of those poor children.

World (updated in no order):

1: A patriarchal mother

2: The queen mother who gave birth to a child in hidden marriage

3: Mothers of left-behind children

4: Single mothers of divorced children

5: The mother of a child with autism

6: The mother of a disabled child

7: “For You” Strong Mom

8: The eccentric mother who abused her adopted child

9: The real and fake daughter of a peasant mother

10: Second child mother

11: The Queen Mother of the Nine Sons

12: The gold-worshiping mother who holds the upper hand

13: Superstitious illiterate mother

14: Stepmother whose mother became a stepmother

15: The poor mother who abandoned her husband and child

16: The Fallen Wealthy Mother

17: Abducted college mother

18: Divorced mother of blind child

19: The loving mother who lacks love for the little father-in-law

20: To be added

- Description from novelbuddy