She also tentatively put her hand into the water, and indeed felt nothing.

Then she put her index finger into her mouth and tasted it.

"Ah, pah." After two breaths, Yu Zheng felt a tingling sensation on her tongue.

At this time, she also felt an itchy sensation on her hands. It wasn't severe, but she clearly felt like she had touched something irritating.

"Husband, how do you feel in your hands?" Yu Zheng asked immediately.

"I feel like I have an itchy feeling." Shangguan Ziqi also felt something strange in his hand.

"Father, please wipe your hands quickly. Concubine Li, please take out your handkerchief and wipe your hands." Upon hearing this, Shangguan Yajing immediately handed the handkerchief in her arms to Shangguan Ziqi.

After listening to her daughter's words, Yu Yuzheng took out a handkerchief and wiped it.

But after all, there was no clean water to wash, and the itchy feeling was always there.

The two of them had the same feeling, which meant that there was something wrong with the water.

Yu Zheng already had an idea in mind.

There is a strong concentration of some chemical substance in the water, but what it is remains to be determined.

"General Feng Lei, put your knife into the water for a while and then take it out. I'll observe if there are any changes." Yu Yu Zheng thought of a possibility.

Feng Lei pulled his sword out of the scabbard and inserted half of it into the water.

"Wait a quarter of an hour before taking it out." Yu Yu Zheng said again.

After waiting for about a quarter of an hour, Yu Zheng let him take it out.

He took the knife from Feng Lei and wiped the water on the surface with a towel.

"Your Majesty, Father, look, has this knife changed?" Yu Yuzheng held the knife in front of several people.

Everybody gathered around to watch.

Three children also squeezed in.

"Princess Li, I see the difference." Shangguan Changrui was the first to speak.

"What did you find wrong?" Yu Zheng asked with a smile.

"The half that was immersed in water had a duller sheen. The top half that was not immersed in water looked as if it had just been polished."

"Yeah, you're right." Yu Yuzheng was pleased that the child had such sharp observation skills.

"Second brother, I just sharpened the knife this morning." Feng Lei got up early in the morning and sharpened the knife. This is his knife, so he must cherish it and keep it shiny at all times.

If the princess hadn't asked him to try with the knife, he would have obeyed. If it had been someone else, he would have been reluctant.

Everyone noticed this change.

"Madam, what does this mean?" Shangguan Ziqi asked the answer that everyone wanted to know.

"Well, let me think about how to explain it." This was a chemistry question, and she had to organize her language so that everyone could understand it.

“You’ve all tasted vinegar, right? We all know that vinegar tastes sour.

The same thing would happen if we put vinegar on the knife.

After a long time, this knife will become useless.

Because the knife will be corroded by the acid in the vinegar.

䀴There should be an acidic substance in this water, like vinegar.

䀴This acidic substance corrodes the surface of the knife, so the luster becomes dull.

I guess the acid in it is quite strong, otherwise it wouldn't have produced such a big effect in such a short time."

After Yu Zheng’s explanation, everyone understood.

"So this is why the water is not drinkable and why there are no fish?" asked the old prince.

"That's right, father. Think about it, if we put the fish in a big jar of vinegar, can they survive?" Yu Ye Zheng said with a metaphor.

"Of course not." Shangguan Changyu answered for his grandfather.

How can fish survive if it’s so sour?

"But if the amount is small, it is still okay. For example, we say that sea water is salty and cannot be drunk, because the salt in it is very concentrated. If we pour a pound of salt into a large pool, can we not smell the salt at all?"

"You mean, the water that the villagers drink on a daily basis may also contain the acidic substance you mentioned, but the concentration is very low?" Emperor Qiming thought of the water that the villagers drank.

"That's right. There is a theory in our medicine that has not been fully proven.

If a woman often eats acidic food, she is more likely to be pregnant with a girl. On the contrary, a woman who often eats alkaline food is more likely to be pregnant with a boy.

The villagers on the island have lived here for a long time, more than a hundred years, and several generations have lived and died here.

Their constitutions have become acidic over time, so the possibility of having a boy becomes smaller and smaller as time goes by, and over time, they have reached this situation now. "

After listening to Yu Zheng's explanation, everyone suddenly understood.

"That is, we have found the reason, but we cannot change it," Shangguan Ziqi concluded.

"Yes, if it is true as I guessed, this island is not suitable for human habitation.

If we want to help the villagers, we have to move them all out. Otherwise, in a few dozen days, there will be no one left here." Yu Zheng said regretfully.

To be honest, this island is so big, it would be a pity to abandon it.

When they came in, they saw that the crops in the fields were growing well. According to Granny Ye, their grain yield was very good.

"They are the people of my Great Wei, and I cannot bear to see them suffer such a fate. So let's move them out. My Great Wei can easily accommodate such a small number of people. We will take them away when we return."

Emperor Qiming knew the reason and made a decision quickly.

"It's still early. Now that we're here, let's go around the lake and see if there are any other discoveries." Yu Yuzheng wanted to take another look.

Who knows what new discoveries might be made.

"Hmm." It was a rare sight for Emperor Qiming to see such a beautiful view, so he took the first step and walked in front.

This mountain is the highest mountain on the island.

Standing on the top of the mountain, you can see far away, all the way to where the sea meets the sky.

From a distance, you can see seabirds hunting on the beach and then flying back to the forest.

I guess he caught some fish and brought them back to feed the little birds in the nest.

"By the way, you just said that the water on the island has an impact on women, which leads to the birth of girls instead of boys. Then why is it that the birds on the island are also like this?" Emperor Qiming suddenly thought of this question.

Just now he was looking into the distance and saw flocks of birds flying in the sky.

"Your Majesty, the birds here are all seabirds. Seabirds feed on fish, which themselves contain a lot of water. So if the birds drink less water from this island, it won't have a big impact.

Besides, not all birds have only one mate for their entire lives. In some species, one male bird can mate with multiple female birds.

Therefore, even if there are fewer male birds, it will not affect reproduction.

Just like the chickens raised by villagers, one or two chickens are usually enough for a family. "

This is very straightforward and everyone can understand it.

Everyone was eating and chatting.

The three children are in their naughty age.

They played and joked all the way.

He also played with the sword.

Shangguan Changyu and Shangguan Changrui started fighting, moving forward as they fought.

The adults watched them having fun.

"Father, please practice with me. As soon as we got up this morning, Concubine Lu dragged us to eat, and then we went out without doing any morning exercises. The scenery here is beautiful." Shangguan Yajing pestered her father.

Everyone was not very quick, Shangguan Ziqi doted on his daughter and drew the long sword from his waist.

The father and daughter started playing with each other by the lake on the top of the mountain.

Suddenly, Shangguan Changrui screamed.

He was forced back by Shangguan Changyu and then fell off a large rock.

Then he stepped on a small stone behind the big stone and overturned it.

Fell to the ground.

Yu Zheng felt sorry for the child and immediately ran over to help him up.

"How is it? Did you fall?" Yu Zheng asked anxiously.

"Princess Lu, it's okay. I'm very tough." Shangguan Changrui patted his butt, picked up the sword and wanted to continue.

"Just keep quiet." Yu Zheng said angrily.

As a result, she took a step forward and was tripped by the stone that had just been stepped on.

He almost fell down, but was caught by Shangguan Ziqi who came rushing over.

Only then did Yu Zheng look down at the stone.

When she looked down, her attention was caught by the bottom of the stone.

She squatted down and looked carefully at the area that had just been exposed under the stone.

"Your Majesty, Father, please come and see. We may have found a treasure." Yu Yu Zheng shouted excitedly.