"Father, my son is going to the medical school and find a few Turkic prisoners to do an experiment!" Li Chengqian didn't know where the old man was mad, but it seemed that he was coming to him.

"Where are those alchemists?" Li Er glanced at Li Chengqian and others in a cold manner, and asked in a deep voice.

"Plainists? They are doing experiments in the Xichi Academy." Li Chengqian was stunned for a moment, not sure why the old man asked about those plainists.

Li Er said expressionlessly: "Take me to see!"

Look? Li Chengqian, who didn't understand Li Er's meaning, twitched his eyes, thinking that the old man would be cremated like those Western priests, like those Western priests, would he?

"What? Is there any problem?" Seeing that Li Chengqian didn't move for a long time, Old Li's voice gradually became cold.

These days he was worried about Goguryeo's affairs. Unexpectedly, in the morning court, a censor impeached Li Chengqian, saying that the boy was recruiting a bunch of alchemists and planned to study the method of immortality.

Old Li may not care about other things and let Li Chengqian do whatever he wants, but this method of immortality is an exception.

So after hearing the words of the censor, Old Li gathered a group of civil servants and military generals, and rushed to the East Palace in groups of horses, intending to see what Li Chengqian was doing with those alchemists.

"There is no problem for the father to see, but it is better to make some preparations before." Seeing that the old man insisted on seeing, Li Chengqian had no choice but to agree helplessly.

I just hope that the bastards in Xichiyuan would not study anything flammable and explosive at this time, otherwise they would be unfair to scare the old man and be chopped up in the head.

Li Er is a person who listened to advice. After seeing that Li Chengqian and Ye Mei were fully armed, he also brought toner masks and goggles as he said.

In Xichiyuan, three or four alchemists were busy preparing some things, and several others were experimenting with brushing silver nitrate on the glass.

"They... are they making mirrors?" Li Er stood at the entrance of Xichiyuan for a while, probably saw some tricks, and asked in a muffled voice through the sound of the mask.

Li Chengqian pointed to the thing that was lifted aside and placed on the ground to dry the pot cover: "The one they made is a condenser, which means that the mirror itself has a curve, which can condense light onto a point through reflection to achieve the purpose of heating. Of course, the one they made is too small, and they can only boil water or something."

"Boil water? Do you mean that you can boil the water with that thing?" Li Er asked in disbelief. He felt like a fool.

He knew every word Li Chengqian said, but if it was connected, he didn't know what this bastard was saying.

He can roughly guess a little of the reflected light, but he doesn't know if it's right, but what is a condenser? Can light also gather? What does it mean to reflect to a point?

Li Chengqian didn't know what the old man was thinking, and was still chattering: "Of course you can boil water, and if this thing is made big enough, it's no problem to melt gold and iron."

"It's nonsense!" Li Er finally couldn't listen, so he turned around and walked out of Xichiyuan. He felt that Li Chengqian was bragging and bullying himself for not having to forget his ability.

It is incredible to use only to boil water. Now I say that it can melt gold and iron, isn’t this nonsense? Do you really think I’m stupid?

Everyone in the Tang Dynasty lived in the sun. If this light could really boil water and melt iron, then are there still many living people in the Tang Dynasty now?

"Hey, hey, father, don't leave, the son-in-law hasn't finished speaking yet." Seeing the old man turn around and leave, Li Chengqian hurriedly chased after him.

When he got outside and took down all the "equipment", Li Erhu asked with a face, "Tell me, what are you trying to do? Don't use the sunlight to boil water to fool me!"

"Father, this is science, you have trust." Li Chengqian had arguing with the old man this time. While speaking, he came to Kong Yingda, pointed to the reading glasses hanging around the old man's neck and said, "Master Kong, lend your old glasses to use."

Old Man Kong took off his glasses from his neck and handed them to Li Chengqian in confusion, not knowing what he was going to do.

This kid is too tempted and always has some strange ideas. Li Er said that using sunlight to boil water, although Lao Kong didn't understand what it meant, looking at Li Chengqian's performance, he seemed to want to show his skills and really planned to boil the water with sunlight.

Now there was a lot of fun. The group of people who followed Li Er were the ones who were not afraid of the trouble when watching the fun. Seeing that Li Chengqian seemed to be really going to use the sun to boil water, he immediately forgot about the purpose of coming here.

Even Li Er was a little confused, feeling that he seemed a little arbitrary just now.

A piece of paper, a piece of glass plus a little water, and combined with the reading glasses in his hand, Li Chengqian taught a vivid physics class to everyone, including Li Er.

The water on the glass sheet was dried under the spots gathered by the reading glasses without long, and the paper was also ignited under the spots.

For a moment, everyone was upset, as if they saw a miracle. Only Li Er felt a little embarrassed and frowned. In addition, Kong Yingda, Old Man Kong kept wiping his sweat, avoiding the reading glasses that Li Chengqian had returned.

Damn it, I knew this thing could burn paper and water, so I shouldn't have worn it at the beginning. These reading glasses were so dangerous.

"Don't worry, as long as you don't wear it to watch the sun, there will be no problem, and your eyes will not be burned." Lao Kong's attitude made Li Chengqian vaguely guess. He explained the precautions for wearing reading glasses to the old man, and forced the glasses to him.

Li Er slowly calmed down his mood and changed his mind very much. Although he was a little embarrassed to be a man just now, looking at it from another perspective, it seems to be a very glorious thing to have such a son with a good face.

Listening to the faint sigh of "Why can't my little bastard do this?", Li Er decided to forgive Li Chengqian for one time.

However, the matter of "boiling water" has been solved, but the matter of "longevity" has not yet been settled. Although Li Er had a premonition that those alchemists might be working on something called science, asking questions is better than not asking questions.

So after Li Chengqian finished his glasses, he coughed and asked, "You brought back those alchemists, are you studying the issue of 'Eternal Life'?"

"Changsheng?" Li Chengqian's eyes almost popped out.

Since the first feudal dynasty of mankind, people have been studying things that have not been found for the past two thousand years. Who has the leisure to continue studying that?
Chapter completed!