Human beings have become smaller in the last days

"Huh? Teacher Qi, did you ask Yun Shuding to make a magic circle?" Song Yi didn't know this.

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

"I see, that's what I'm saying." Song Yi understood.

The aircraft then conducted several more experiments, mainly testing the aircraft's performance, speed, stability, how long the crystal core could last, and the hardness of the shell.

Although Li Hua took this into consideration when he was doing it, he couldn't break away from the material limitations of mushrooms, so the previous experiments still caused some damage to the materials outside the aircraft.

"This won't work." Teacher Qi wanted to keep improving.

"We can go back to the city first, and then slowly transform it." Others think this is enough. After all, they are not far from the city, so they can go back first.

Teacher Qi naturally knows this truth, but it’s not certain whether the group of them will be able to get together again by then. But after all, he knows everyone’s thoughts, so he just wants to let it go.

"No, we are originally near a deep forest, and there are many mutated birds. What if we are attacked by a group of people without paying attention." Ye Lin disagreed, and Song Yi and He Chen also agreed with her idea.

"As for defense, there is something I haven't taken out." Song Yi also said. She found a roll of mushroom paper from her bag with defensive runes written on it.

"I figured this out when I was studying magic circles and runes. I asked Senior Sister Zhou to identify it. It is a rune with defensive capabilities and can be engraved on the outside of the aircraft." Song Yi said as he opened it.

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

They first tried a piece of material, and after drawing the defensive runes on it, they found that its defense power had indeed increased several times, because according to Song Yi, this rune could be stacked, at least 3 layers, which is equivalent to The defense suddenly increased more than ten times, which was enough.

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

Everyone happily went back to sort out their clothes and belongings. Song Yi was also very happy and went back to pack her own things. She had a space bag, so she didn't need to ask for help from someone with space powers.

However, after arranging it, Song Yi felt something was not right and felt uncomfortable, so she went to the toilet and found out that she was menstruating.

She counted the time and suddenly frowned: "Oh my God, my amenorrhea injection is actually due."

150 years ago, someone developed a safe and harmless amenorrhea injection, which can make women amenorrhea. It lasts for one year and does not cause any harm to the body. When the time is up, menstruation will occur normally.

Amenorrhea injections are controlled by the state. Women can go to the hospital for injections after menarche. From then on, women no longer have to worry about menstruation, nor do they have to worry about unwanted pregnancies.

Of course, this is also based on the premise that the world has long studied the in vitro uterus. As early as 230 years ago, the in vitro uterus was developed. From then on, women got rid of the trouble of childbirth. Coupled with the emergence of nanny robots, countries around the world The population, which had been declining, began to rise again.

The development of amenorrhea injection has made women more relaxed and worry-free. Although every woman must submit 25 high-quality eggs at the age of 5, or choose to get married and have children on her own, this is not a problem.

Therefore, after the end of the world, even though she became smaller, Song Yi never thought about the issue of sanitary napkins. If these items were not used during menarche and at the age of 25, they might have been eliminated directly.

Song Yi was caught off guard when the amenorrhea injection was due. She was not prepared at all. After squatting in the toilet for a long time, she decided to send a message to Zhou Wan and asked her to ask Xie Xueyi for help to see if she could make a sanitary napkin.After a while, Zhou Wan came over with a pack of sanitary napkins. When she came out, she smiled and said, "Don't you even know that the amenorrhea injection is due?"

"I set a regular reminder for the bracelet, but the Internet is not available now, so it didn't remind me 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 spare." Zhou Wan replied.

"Yours is also due?" Song Yi raised an eyebrow.

"It has expired a long time ago." Zhou Wan glanced at her: "The earliest one among us expired was 3 months ago, and I expired more than a month ago."

"Why didn't I know?" Song Yi was confused. There were many girls in their group. This kind of thing should be reported to the police, right?

"You were busy studying formations at that time. How could you have time to pay attention to this? If you hadn't come here by yourself, you would have forgotten this." Zhou Wan was speechless.

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

"Okay, now that you're on your period, just go to Xie Xueyi's place to get sanitary napkins later. You can get two months' supply at a time. Remember to return mine." Zhou Wan said.

"I understand." Song Yi nodded and watched Zhou Wan leave. She took the dirty clothes to the laundry room and washed them quickly. There was detergent.

Then throw it into the washing machine for spin drying and drying. Well, it is a waste to use the washing machine for such a small amount of clothes, but there is no way, it will be gone soon, and it is impossible to wait for it to dry.

After the clothes were dry, she put them directly into the space bag. Anyway, she had put away most of the things in her room. Then she went to Xie Xueyi and asked her for sanitary napkins.

"Yours is also due." Xie Xueyi heard that Song Yi's purpose was clear, and then took her into the room, opened a space bag the size of a backpack, took out two months' worth and handed it to her.

"Did Li Hua make these materials?" Song Yi asked after putting away the sanitary napkins.

"Yes, who else can do it besides her." Xie Xueyi nodded.

The outer layer of the sanitary napkin is made of lotus leaf film, but the inside is not cotton but made of blood-sucking vines. Blood-sucking vines are quite common mutated plants here, except for the one conquered by Qian Xin. , the others were basically eradicated.

Zhou Hui said that the vine was very good at sucking blood, so he brought it back for research. However, he didn't know what it would be used for at first. It wasn't until the first person who expired the amenorrhea needle showed up that it really had a use.

"That's not bad." Song Yi didn't expect that the material of the sanitary napkin was actually blood-sucking vine, and she was also very surprised.

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

"You're right." Song Yi nodded.