I am the cook, but I am Li Er's son-in-law

"Maybe it is really auspicious." Li Shimin smiled and stood up.

Qian Niuwei flattered at the side: "Gold fell from the sky, so it should be."

Li Shimin shook his head, waved his hands, walked a few steps outside, suddenly stopped, and turned his head to look at Empress Changsun: "Won't the maidservant Guanyin go with me?"

"Look at what those two little girls have done to my flower garden."

Empress Changsun was stunned for a moment, then looked at the gold in Li Shimin's hand: "You said the two of them made this thing?"

Li Shimin nodded.

Qian Niuwei was taken aback, and opened his mouth, as if he wanted to say that there was no trace of the two princesses in the vicinity, and this thing did not fall from a high place.
Empress Changsun moved her steps, followed behind Li Shimin, and then went straight to the garden.

Eunuchs and maids were busy carrying lanterns.

Li Lizhi and Li Shu were not idle either, they ran around everywhere, they were not as careful as maids and eunuchs, they knew that the flowers and plants cherished by their father had been transplanted out.

Those little plants that had just sprouted were crushed to the ground.

Empress Changsun looked at this scene in astonishment. She didn't come here for a few days. She didn't expect that this place has been damaged so much that it is so different from what she remembered.

When the maids and eunuchs saw Li Shimin, they hurriedly stopped their movements and greeted him.

Li Lizhi and Li Shu also carried lanterns and hopped over to greet Li Shimin and Empress Changsun.

"Father, what are you doing here?" Li Lizhi tilted her head and asked, "We are quarreling with you?"

Li Shimin shook his head, spread his hands, revealing Jin Zi: "Are you looking for this thing?"

The eyes of the two little girls lit up immediately.

"How could the gold be with the emperor?" Li Lizhi was a little surprised.

Li Shu looked into the distance, a little lost in thought.

"It fell to me." Li Shimin waved his hand and called the Jinwu Guard behind him, "He picked it up."

The surprise in Jin Wuwei's eyes couldn't go away.

Is it really made by two princesses?
But from the imperial garden to the place where he was patrolling, two palace walls were separated, at least a mile or so away. The two princesses looked relatively small, but they didn't expect to have such great strength.

"I was patrolling in front of Xuande Gate, and suddenly gold fell from the sky. I thought it was auspicious, but I never thought it was two princesses."

Qian Niuwei hadn't finished speaking.

Li Shimin glanced at him and shook his head: "For me, this is a great auspicious sign."

"Tell me how you managed to get the gold so far away."

Speaking of this, Li Lizhi's face was full of excitement: "What we just researched, gunpowder is used as a primer, and it can be fired out in a tube."

While talking, she ran back and showed Li Shimin the bamboo tube that had been split in two.

"Use it once and it's useless?" Li Shimin took it, looked at the scorched black marks on the bottom, and raised his eyebrows.

Li Shu explained casually: "We may have filled a little more gunpowder, and if we add a little less in the future, we may be able to use it a few more times."

"If the father needs to use it for a long time, my sister and I can figure it out."

Li Shimin was stunned for a moment, and stopped while trying to figure out the bamboo in his hand: "Forget? Can this thing be calculated by arithmetic?"

Li Shu nodded, confidently: "Of course, after knowing all the conditions, and collecting the right amount of data, a reliable conclusion can be drawn."

All the conditions are known, and the appropriate amount of data is collected, and reliable conclusions can be calculated.
These three words, like an anvil, slammed into his chest with a ding.

"Is this one of the knowledge that the store gave you?" Li Shimin asked softly.

These three sentences are very attractive to him.

The two little girls nodded.

"Except for gunpowder, can you figure out other things?" Li Shimin asked again.

Li Shu hesitated for a moment: "Brother Zhengyang didn't say this."

Li Shimin nodded, and made up his mind. He planned to go to the restaurant earlier when he was taking a bath, and discuss this issue with Yin Xuan.

"Fireworks, have you already researched it?" Li Shimin stopped talking about the question just now, but asked other questions instead.

The two little girls sighed.

"Not yet, what we're thinking now is, split the gunpowder into two parts, and now it's just successful in getting things up, but whether the gunpowder can go up. We're not that confident."

When they first took over the homework assigned by Yin Xuan, they were full of confidence.

I felt that I had thoroughly understood the knowledge taught by Yin Xuan, it was just a small firework, but when I really started to do it myself, I realized it was too difficult.

Practice is far more difficult than theory.

It has been almost a month since they got this topic and today they tried to shoot things out, and in a few days it will be the vernal equinox, and the vernal equinox will be Qingming.

Time is tight.

Their faces gradually became serious, and after speaking to their father and queen mother, they directed the maids and eunuchs to get busy and continue to do research.

Empress Changsun was a little dazed watching from the side, and pursed her lips: "I didn't expect the two of them to be so handsome now."

In her impression, Li Lizhi and Li Shu were still innocent and lovely children, they seemed to be so focused on one thing, she never thought that this kind of appearance would appear on her two daughters.

"In this regard, it is quite like you."

Li Shimin laughed loudly: "After all, she is my daughter." He waved his hand and took the eldest grandson back to the empress. After sitting down, he did not deal with the case again immediately.

Instead, he pulled out a blank notebook, wrote down what he heard from Li Shuna today, and sent someone to send it to the general prison.

Although there is still no way to fire the artillery.

But at least he could launch other things, which reminded him of the trebuchet - as a sharp weapon for siege, the trebuchet was really troublesome to use.

The filling speed is slow, and it takes at least 300 people to operate one.

He heard from his daughter that after the explosion of gunpowder, the gas produced in an instant expands, which can push very heavy things.

Can we build something to replace the trebuchet?

After all, sometimes he would also listen to Yin Xuan's lectures to his two daughters. Although most of them didn't quite understand, what he might understand would make him seem to open a new door.

Li Shimin faintly had an idea.

He didn't plan to let his two daughters do this idea. Datang has not yet reached the point where the two women can support weapons, so let them study fireworks in peace.

Early the next morning.

Zhou Bu waited at the entrance of the restaurant, and when Yin Xuan came over, he raised his hand: "Shopkeeper, good news!"