Dean Wu carefully cleaned up the table of the last experiment, and said to the students: "I came to class today, and I saw several students stepping on the bell to enter the classroom. ”

With that, the students in the audience let out a burst of laughter.

Dean Wu then said: "Although eating chicken is good, it is not full. Ay? Why do I still rhyme, double rhyme. ”

The laughter of the students in the audience was even louder. Although this Dean Wu is old, he is not outdated at all, and he is very humorous, and it seems that there is a reason why students like to come to his class.

Dean Wu said, "I just want to ask, your time card is so tight, do you have time for breakfast?" Come, I'll take a look, and raise my hand if I haven't eaten breakfast. ”

The students in the audience raised their hands one after another, and there were quite a few. Dean Wu: "Raise a little higher, are you hungry and don't even have the strength to raise your hands?" ”

The students' hands were raised even higher, and there were even a third!

Dean Wu shook his head helplessly: "Okay, put it down, it seems that you don't know the importance of breakfast at all." Let me tell you a story from when I was a child. ”

As soon as the students heard that Dean Wu was going to tell the story, everyone changed their sitting posture and became more curious and serious.

Dean Wu tilted his head and began to reminisce, saying: "When I was young, our family was in the village, and although the family was not wealthy, eating was never a problem. For a while, I had a problem, that is, I didn't like to eat breakfast, I didn't want to eat anything at home, I just wanted to play. No one could care about me until one day my grandmother told me something. ”

The students' eyes widened even more, and Dean Wu began to imitate the old grandmother's voice: "Grandson, grandma will tell you a story, in the east of our village, there is a little ghost in the old Wang family who is about the same age as you, and like you, he doesn't like to eat breakfast, guess what happened to him in the end?" ”

Dean Wu resumed his voice: "Huh? What's wrong? ”

Dean Wu learned from his grandmother again: "Later, that child died not long after!" ”

Speaking of this, Dean Wu paused, and the students were also shocked, the opium was silent under the podium, and everyone suddenly felt sad for this tragic story.

Dean Wu said very seriously and sadly: "I was frightened and shocked, judging from my grandmother's serious expression, she didn't lie to me, and then I never missed breakfast again." This incident is a shadow that I cannot erase from my childhood. ”

The audience was still quiet, and the atmosphere reached freezing point.

Dean Wu sighed sadly, but with a ghostly smile on his face, he continued, "This was just the beginning of my childhood tragedy, and later whenever I was naughty, my grandmother would tell me stories. When I was mischievous and threw things on the ground, my grandmother would tell me that there was a kid about my age in the west of the village who also threw things around the day and died not long after. Later, I lied once, and my grandmother told me that there was a child about my age in the east of the village, who also lied every day, and died not long after. There was also a child who died not long after eating snacks every day... ”

Before Dean Wu finished speaking, his cold humor caused the students in the audience to burst into laughter. Even Chen Jieyang outside laughed: "This old naughty boy is so cute, I thought the story was true at the beginning." ”

Dean Wu paused, made a puzzled expression and said: "Later, when I was a little older, I asked grandma, grandma, the children in our village are so miserable, they died if they had nothing to do, and there have been dozens of children who have died over the years." ”

The classmates laughed even harder. Dean Wu followed his grandmother's example again: "Grandson, don't care about these details. So you have to study hard, obedient. ”

Dean Wu told a serious joke, which made everyone laugh.

Dean Wu made another gesture to make everyone quiet, and said seriously: "Okay, what I mean by saying so much is actually to express how important it is to have breakfast. ”

With a smile on his face, Dean Wu continued, "The plan of the day is in the morning, and skipping breakfast will not only make you uncomfortable. A new study in Germany has found that breakfast not only has an impact on a person's physical condition throughout the day, but also affects a person's mood. Breakfast provides the energy and nutrients your brain needs to synthesize neurotransmitters. Proteins, carbohydrates, and fats from breakfast meats can also affect mood. That said, if you don't eat breakfast, your emotions are likely to explode and you will pass on negative emotions to more people. So for the sake of yourself and your friends, please wake up ten minutes early every day and have breakfast. And for the sake of those who are about the same age as you. ”

The audience burst into laughter again, and every word of Dean Wu was like a joke.

Dean Wu continued, "But since you haven't eaten breakfast today, I'll make some black bread for you to satisfy your hunger." ”

The students heard that Dean Wu was selling Guanzi again, and they paid more attention.

I saw that Dean Wu took an empty beaker, poured a small half cup of white solid into the empty beaker, then took another reagent, opened the lid, and slowly poured the liquid into the cup, stirring while pouring.

Something magical happened, and the solid white color inside gradually turned black and began to swell. The students in the audience were surprised and discussed. The swelling gradually overtook the beaker, and with the faint white smoke, the black swelling continued to "grow", like a black loaf of bread growing on the sides, and gradually, the black bread had exceeded the height of three beakers, and grew more than ten times from a little bit of white solid.

Chen Jieyang watched it with relish, and Yu Fan smiled: "Sure enough, it's a black bread experiment." ”

Chen Jiaoyang quipped: "Old Yu, how do you know everything?" ”

Yu Fan: "I just know." ”

The growth of bread gradually stopped, and Dean Wu began to speak again: "Which student dares to come up and eat this bread?" ”

The students shook their heads.

Dean Wu: "That's right, this bread can't be eaten, the white granular solid I poured is white sugar, and the liquid I pour next is concentrated sulfuric acid, concentrated sulfuric acid All students know that in addition to acidity and corrosiveness, there is also an important property is dehydration, that is, the property that can forcibly remove hydrogen and oxygen in the substance according to the ratio of 2:1 according to the number of atoms. One mole of white sugar (sucrose) is dehydrated to produce twelve moles of carbon and eleven moles of water, followed by one mole of carbon and two moles of concentrated sulfuric acid to produce one mole of carbon dioxide, two moles of sulfur dioxide, and two moles of water. A black rod-like substance 'grows' out of the beaker, which is black carbon. “

The students took notes carefully.

Professor Wu continued, "Today we will explore the application of industrial dewatering performance. ”

After a wonderful opening speech, Professor Wu began to get into the main topic of the lecture.

Yu Fan admires Professor Wu very much, one is his rigorous professional attitude, the second is his humorous style, and the third is that Dean Wu has been sticking to what many university professors are losing - the original intention.