"Huh? Teacher Qi, did you find Yun Shuding to make a magic array? "Song Yi doesn't know this.

"Yes, I also considered that I might encounter mutant birds, and if I dodge, it might affect the inside, so I asked Yun Shu to find a way, and she gave me this." Teacher Qi nodded.

"I see, I said." Song Yi understood.

The aircraft then conducted several experiments, mainly to test the performance of the aircraft, its speed, stability, the time the crystal nucleus can last, and the hardness of the shell.

Although Li Hua took this into account when he made it, he couldn't get rid of the material limitations of mushrooms, so the previous experiments still caused some damage to the materials on the outside of the aircraft.

"That's not going to work." Teacher Qi wants to keep improving.

"We can go back to the city first, and then slowly renovate." Others thought that this was already enough, after all, they were not far from the city, and they could go back first.

Teacher Qi naturally knows this truth, but it is not certain whether their group of people will be able to get together again at that time, but in the end, he also knows everyone's thoughts, so he wants to forget it like this.

"No, we are originally near the deep forest here, and there are many mutated birds, what if we don't pay attention to being attacked by a group." Ye Lin disagreed, and Song Yi and Hechen also agreed with her idea.

"As for defense, I don't have something to show up." Song Yi also spoke, and she took out a roll of mushroom paper from her satchel with defensive runes written on it.

"This thing was figured out when I was studying the magic array and runes, and I found Senior Sister Zhou to identify it, it is a rune with defensive ability, which can be engraved on the outside of the aircraft." Song Yi said as he opened it.

"Oh, try it." Teacher Qi suddenly became interested.

They first took a piece of material and tried it, and after drawing the defensive rune, they found that its defensive power had really increased several times, because according to Song Yi, this rune could be stacked, at least 3 layers, which was equivalent to a sudden increase in defensive power by more than ten times, which was enough.

Then they began to add defensive runes to the aircraft, with Li Hua, the speed was still very fast, it took three days to complete the modification, and after another experiment, Ye Lin announced that they would leave here in three days.

Everyone happily went back to tidy up their clothes and belongings, Song Yi was also very happy, went back to pack her things, she had a space bag, but she didn't need to ask for help from a space ability.

But after tidying up, Song Yi didn't feel right, and always felt uncomfortable, so he went to the toilet, and then found that he was menstruating.

She calculated the time and immediately frowned: "Oh my God, my amenorrhea needle actually expired." ”

One hundred and fifty years ago, someone researched a safe and harmless amenorrhea needle, which can make women amenorrhea for one year, without any harm to the body, and menstruation will occur normally after the time is up.

Amenorrhea injections are controlled by the state, and women can go to the hospital for injections after menarche, and since then, women no longer have the trouble of menstruation, and they don't have to worry about unexpected pregnancy or anything like that.

Of course, this is also under the premise that the world has long studied the in vitro uterus, as early as 230 years ago, the in vitro uterus was studied, since then women have gotten rid of the trouble of childbirth, coupled with the emergence of nanny robots, so that the population that has been declining in various countries has begun to rise again.

The research and development of amenorrhea needles makes it easier for women to worry about it, although every woman has to submit 5 high-quality eggs at the age of 25, or choose to marry and have children by herself, but this is not a problem.

Therefore, after the end of the world, although it has become smaller, Song Yi has not thought about the problem of sanitary napkins, if this thing is not used at the age of menarche and 25 years old, it may have been eliminated directly.

Song Yi was caught off guard by the expiration of the amenorrhea needle and came to her aunt at this time, she didn't have any preparation at all, squatted in the toilet for a while, she decided to send a message to Zhou Wan and asked her to ask Xie Xueyi to help see if she could make a sanitary napkin.

After a while, Zhou Wan came over with a pack of sanitary napkins, and when she came out, she smiled and said, "Don't you know that the amenorrhea needle expires?" ”

"I set a regular reminder for the bracelet, but it's not that there is no internet now, so I wasn't reminded at all." Song Yi was speechless, "Why did you come here so quickly?" Are sanitary napkins so easy to make? ”

"Of course not, this is my backup." Zhou Wan replied.

"Yours is due, too?" Song Yi raised his eyebrows.

"It's long due." Zhou Wan glanced at her: "The earliest of us to expire was 3 months ago, and I expired more than a month ago." ”

"How did I not know?" Song Yi was at a loss, there are a lot of girls in their group, this kind of thing should be reported, right?

"You were busy studying the formation at that time, where did you have time to pay attention to this, if you hadn't come by yourself, you would probably have forgotten about this." Zhou Wan was speechless.

"Aha." Song Yi smiled awkwardly, calculated the time, and found that three months ago, he was really busy studying the formation.

"Okay, since you have your period, you can go to Xie Xueyi to get sanitary napkins in a while, you can get two months at a time, remember to return mine to me." Zhou Wan said.

"I see." Song Yi nodded, watched Zhou Wan leave, came to the laundry room with dirty clothes, and washed them, there was detergent, and they were washed quickly.

Then throw it into the washing machine to spin and dry, dry, well, it's a waste to use the washing machine for just a little bit of clothes, but there is no way, this is going to leave soon, and it is impossible to wait for it to dry.

When the clothes were dry, she received them directly into the space bag, and she put away most of the things in her room anyway, and then went to Xie Xueyi and asked her for sanitary napkins.

"Yours is due, too." Xie Xueyi heard that Song Yi was coming, and then took her into the room, opened a backpack-sized space bag, and took out two months' worth and handed it to her.

"These materials were made by Li Hua?" Song Yi asked after putting away the sanitary napkin.

"yes, who else but her can get it." Xie Xueyi nodded.

The outer layer of the sanitary napkin is made of lotus leaf film, but the material inside is not cotton but made of vampire vine, which is still a common mutant plant in them, except for the one that was accepted by Qian Xin, the others have basically been eradicated.

The vine was brought back for research by Zhou Hui with a sentence that it was very blood-sucking, but at first I didn't know what to use it for, and it wasn't until the first person with an expired amenorrhea needle appeared that it really had a use.

"That's not bad either." Song Yi didn't expect that the material of the sanitary napkin was actually vampire vine, which was also very unexpected.

"There are many species in the New World, and we need to rediscover their uses." Xie Xueyi said.

"You're right." Song Yi nodded.