When he arrived at Li Er's Taiji Palace, Zhang Nan found his place to stand, and after a while, Li Er walked into the Taiji Palace and began to deal with the day's government affairs.

Every day's morning dynasty is much the same, so Zhang Nan is still in his position as a horse, standing up to sleep, Li Er's morning dynasty is a convention, Zhang Nan's morning dynasty sleep is also a routine, and now Zhang Nan's biological clock is used to sleeping at this time of day.

But Li Er doesn't seem to want Zhang Nan to sleep so grandly today, Zhang Nan used to sleep, Li Er opened one eye and closed one eye and passed, but today it may be Li Er's aunt who came to see Li Er, Li Er actually woke up Zhang Nan for the first time, and reprimanded Zhang Nan fiercely.

"Qingquan, did you go as a thief last night? Why are you so sleepy today? Zhang Nan was also taken aback by Li Er's sudden roll call, but soon Zhang Nan calmed down, and then stood up and said: "Don't dare to deceive the emperor, the minister did work late yesterday." ”

"Oh? Then you should tell me what you did last night, so that you ran to the medical school to supervise the work at night? Li Er asked strangely, Zhang Nan was so diligent for a while, Li Er was still a little uncomfortable, seeing Zhang Nan so diligent, Li Er suddenly felt a feeling of blaming the good minister.

However, Zhang Nan's next words made Li Er's guilt that finally emerged to death.

"Chen didn't go to supervise the work last night, but was busy refining daffodil essential oil." Zhang Nan said.

The other ministers all looked like they were in a fog, and they didn't know what this daffodil essential oil in Zhang Nan's mouth was. Although Li Er didn't know what daffodils essential oil was, Li Er knew about daffodils, and it was only yesterday that Zhang Nan begged for his own business.

"Ridiculous, as an important minister of the imperial court, do you work all night just to play with flowers and grass?" Li Er looked angry.

"Eh, the emperor's words are not right, do you know what this daffodil essential oil is for?" Zhang Nan asked.

When Li Eryi heard Zhang Nan say this, he thought that this daffodil essential oil had some important effect, so he asked: "This is lonely and unheard, what is the use of this flower for ornamentation?" ”

"Of course it's useful, after yesterday's sleepless efforts, I finally succeeded in extracting the essential oil from the daffodils, do you know what this sign is?" Zhang Nan asked.

"What?"

"This marks that our Datang perfumes can be produced independently in the future." As soon as Zhang Nan's words came out, the entire court was quiet.

Even Li Er, who was sitting on the dragon chair, was shocked, is this his most important courtier? This sleepless night is just to make perfume for the women of Datang? Although this perfume Li Er also uses it every day, and he has to spray it several times a day.

"Bastard, you, you, you, you're so angry. As the director of the labor reform bureau of the imperial court from the fourth grade, you actually, actually. Li Er was so angry that he couldn't say anything, for a guy like Zhang Nan who was smart and didn't use it on the right path, Li Er really didn't know what to say.

"It's not illegal for this minister to get a flower essential oil." Zhang Nan asked cautiously.

When Li Er heard this, he was also speechless for a while, this is indeed not a crime, no matter how powerful Li Er is, he can't interfere with what officials are doing at home, but Li Er still doesn't approve of Zhang Nan's behavior of "engaging in side business".

“...... Qingquan, I still hope that you can serve your country more, and your talents should not be wasted on these things. Li Er said with a bitter look.

"Does the emperor think this thing is useless?" Zhang Nan asked rhetorically.

Li Er didn't speak, but just gave Zhang Nan a look for Zhang Nan to experience for himself.

"The minister just wants to borrow this thing to draw out what the minister wants to play for the emperor today." Zhang Nan said that although Li Er's anger was completely unexpected by Zhang Nan, he still had to get down to business.

"Oh? So what do you want to say to me today? Li Er heard that Zhang Nan was going to play for the first time, so he asked.

"The minister wants to tell the emperor about this independent scientific and technological research and development today." Zhang Nan nodded.

"Independent technology research and development? What is it? Li Er was puzzled by this emerging term that Zhang Nan said.

"And Rong Chen asked, what does the emperor think the emperor thinks the minister gave to the emperor a hot air balloon, a kamikaze crossbow, and even that motorcycle?" Zhang Nan asked, Zhang Nan didn't give himself credit, he just wanted Li Er to understand the importance of this technology.

"Artifact." Li Er said simply and directly.

"Did the emperor ever think that if there were no ministers, someone would still make this thing, it's just a matter of time." Zhang Nan continued to ask.

After hearing Zhang Nan say this, Li Er began to think, if Li Er hadn't seen those things, he would definitely not believe it, but now Li Er has seen these things.

In addition to motorcycles and hot air balloons aside, whether it is a kamikaze crossbow or a hot air balloon, there are traces to follow in the past, so if there is no Zhang Nan, Li Er believes that there will still be others who will make these things.

"This ...... I really believe that there will still be people who will make these things. Li Er nodded and said.

"That's right, that's right, even if there is no minister, someone will make it, but it may take more time. Rong Chen asked the emperor again, if the emperor gathers people like ministers and have wonderful ideas, what he has to do every day is to help the emperor invent new things, engage in scientific research, engage in agricultural tools, engage in weapons, and do anything, what does the emperor think? Zhang Nan asked.

"This, naturally, there will be more and better things coming out, but Qingquan, not everyone in this world is like you, who can be lucky enough to worship the crossing door and learn from the elders of a hundred schools." Li Er frowned and said, for Zhang Nan's talent, Li Er is one hundred and twenty recognitions, if Zhang Nan does not have this talent, Li Er will not be able to bring Zhang Nan into Chang'an and let him enter the palace as an official.

"The minister dared to ask the emperor, the Mo family's tricks, has the emperor heard of it." Zhang Nan said.

Li Er nodded and said: "Naturally, I have heard of this, I have read the records in "Mozi Beicheng Gate", and I still remember the tools for defending the city recorded in it very clearly. ”

"The emperor has heard of it, then it will be easy to do, the minister has an idea, and I hope the emperor can listen to it." Zhang Nan said.

"Qingquan, but it doesn't hurt you to say it, if you say it wrong, I won't punish you, if you say it well, I will be rewarded." Li Er heard that Zhang Nan was about to put forward his own opinions, and immediately said that judging from past experience, Zhang Nan's opinions put forward so formally in the court were very constructive.