Upon hearing this, Zhang Anan burst into laughter. He had long heard that Princess Jinyang had been keeping a close eye on his homework every day, driving the boy almost crazy.
"I'm sorry to disappoint you, young master. This old servant has not come to take the young lady home, but on the orders of my master to bring you a difficult problem."
"problem?"
Li Jue gets a headache just hearing the word "question," let alone a difficult one!
"no!"
"My head is throbbing terribly right now, I'll die if I have to do any more homework!"
Seeing that his eldest grandson was about to run away, Zhang Anan quickly told him the conditions that His Majesty had offered.
"Wait!"
"My master said that if you can solve this problem, you'll be exempt from three days of homework!"
Upon hearing this, Li Jue immediately stopped, turned around with a look of surprise, and asked.
"real?"
"Of course it's true!"
"Can't even my aunt control me?"
"That's natural!"
When Si Zi heard this, he became interested. The problem that could make his father take the initiative to reduce the child's homework must have stumped everyone in the court.
Otherwise, given my father's petty temper, he would never have issued such an edict.
"Uncle Zhang, what exactly is the problem?"
Zhang Anan smiled upon hearing this, then opened the box and took out the crystal ball.
"That's the problem!"
"Someone posed a difficult question to the owner, asking him to thread a golden thread through a crystal ball!"
"What's so difficult about that?"
"Uncle Zhang, if I solve this, will I not have to reduce my nephew's homework?"
"certainly!"
"Master said that only if the young master solves the problem will it count; if the young lady solves it, it naturally won't count!"
As soon as Zhang Anan said this, Si Zi and Li Jue immediately rushed towards the crystal ball.
"Give me!"
"I touched it first!"
"I'll go first..."
"Ouch! Why are you biting me?!"
Li Jue clutched his arm in pain, glaring at his aunt with a face full of resentment.
"Auntie, you're really pushing me to do my homework! Aren't you afraid of breaking your two front teeth?!"
"Hmph!"
"I'm happy even if it crashes!"
Si Zi tried for a long time with the crystal ball, even digging three feet into the ground to catch a few ants, but still couldn't thread the golden thread through. In the end, he had no choice but to throw the crystal ball to Li Jue.
"Hmph, you got off easy!"
Zhang Anan chuckled upon hearing this.
"This question is quite difficult; it might not be easy for the young master."
Li Jue curled his lip in disdain upon hearing this.
"The fact that even this simple problem stumped Mr. Li and his aunt shows just how stupid those two are!"
"Give me fifteen minutes, and I'll thread the gold thread through it immediately!"
After saying this, Li Jue took the crystal ball and went to his workshop.
His workshop was very large and filled with all sorts of strange and unusual things.
Li Jue picked up a bamboo tube and made a simple syringe using cotton, eucommia gum, and other materials, then aimed it at one end of the crystal ball.
Then, a thread was tied to the soft Eucommia ulmoides gum, and the other end was inserted into the hole of the crystal ball. Using the principle of vacuuming, the thread was threaded through the twisted holes.
Si Zi watched in disbelief, his face filled with astonishment.
"Nephew, what method did you use? It's even more effective than ants!"
"This is physics; you wouldn't understand it even if I explained it to you!"
Upon hearing this, Si Zi asked with a look of anticipation.
"Could you teach me?"
"Teach you?"
"Uh-huh!"
"Aren't you learning medicine from my senior brother right now? How do you still have time to study physics?"
"My aunt is very smart. She has already memorized the Yellow Emperor's Inner Classic. In a few more days, she will be able to learn pulse diagnosis from Master Sun!"
"ah?"
Li Jue was also surprised when he heard this. The Yellow Emperor's Inner Classic was such a thick book, and this girl had memorized it in just a few days.
"I'll think about it..."
"Nephew, if you teach me physics, I'll write a hundred words for you every day!"
Li Jueyi immediately agreed upon hearing this.
"make a deal!"
Seeing that the aunt and niece were discussing knowledge he did not understand, Zhang Anan immediately picked up the crystal ball and returned to Chang'an to report back.
As soon as Li Shimin woke up, he saw Zhang Anan's old face again.
"Why are you back so soon?"
"Your Majesty, the eldest grandson is too clever; he solved the Goguryeo problem in less than a quarter of an hour!"
"What?"
Li Shimin was taken aback when he heard this. He had never expected his grandson to be able to solve the problem; he just wanted to tease him with the crystal ball.
"How is that possible!"
Upon hearing this, Zhang Anan immediately presented the crystal ball.
"Your Majesty, please look!"
Li Shimin looked closely and indeed saw that the golden thread passed through the crystal ball, completely revealing the winding path inside the crystal ball.
"Goguryeo deserves to die! This roundabout route is just deliberately making things difficult for us!"
Zhang Anan echoed this sentiment.
"yes!"
"Fortunately, our eldest grandson was clever and solved the problem. Otherwise, our great Tang Dynasty would still be ridiculed by a small country like Goguryeo for having no one to rely on!"
Li Shimin snorted coldly upon hearing this.
"Hmph!"
"Summon the Goguryeo envoy to the palace tomorrow, and let him see the elegant and refined figures of our Great Tang!"
The next day, the Goguryeo envoy Yeon Josaeng arrived at the main hall in an arrogant manner.
However, when he saw that the gold thread had passed through the crystal ball, his face was filled with horror.
To be honest, this problem was so difficult that not only the Tang Dynasty couldn't solve it, but even Goguryeo had no one who could.
However, this seemingly unsolvable problem was actually solved by the Tang Dynasty.
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