In addition to light, he also said that the speed of free fall is not determined by weight, but by air resistance. For example, a 20-jin iron ball and a 1-jin iron ball fall from mid-air at the same time, and they take the same time to land.
The children still didn't understand this. Zhao Jun had a book of interesting physics experiments. He planned to teach the children some basic physics knowledge after his eyesight improved, so that they could study physics after entering junior high school.
As Zhao Jun continued teaching, giving some basic physics knowledge, Yan Shu, standing beside him, frowned. After a moment, he relaxed and whispered to Zhao Zhen, "Your Majesty, it seems that Zhao Jun will regain his sight soon. We should make preparations early."
"So soon?"
Zhao Zhen was extremely surprised. Zhao Jun had only been there for less than two months, and if he was about to regain his sight, it was not good news for him.
Yan Shu shook his head and said, "He was able to see things some time ago, and he should be able to see things soon now. And didn't you hear him talking about 'light'? He himself is very eager to see. I'm afraid that even if he can only see vaguely, he will take off his veil."
Zhao Zhen whispered, "Can the imperial physician find an excuse to delay?"
"It should be possible."
Yan Shu said, "Last time he could only see two dark shadows. I don't believe he will be able to see again soon. Tomorrow morning, when it's dark, let the imperial physician examine him again and tell him not to remove the veil until his eyes are healed. This is related to whether his eyes can be restored. I think he will obey."
"Um."
Zhao Zhen nodded.
Both of them lowered their voices and whispered to each other, while Zhao Jun was lecturing loudly.
Soon after the class ended, he heard a clear voice filled with surprise: "Big Daddy, you're here."
An interesting point in ancient times was that father was called "ye" and grandfather was called "die".
Because "Ye" comes from the ancient people who called their father "Ye Ye", and gradually it became "Ye Ye", such as in the poem "The Ballad of Mulan", "My father has no eldest son, and Mulan has no elder brother."
By the time of the Song Dynasty, father became "Dad" or "Daddy", grandfather became "father-in-law", "Grandpa", "Grandfather", "Big Uncle", etc., and some people even called stepmother "sister".
These are all recorded in the Records of the Four Dynasties, Zhu Xi's Sayings, and Longchuan Biezhi.
Yan Shu was from Linchuan County, Fuzhou, which is Fuzhou, Jiangxi Province in later generations. In the local dialect, they called their grandfather "Big Daddy", and this name is still used in many places in Jiangxi today.
If Zhao Jun was from Jiangxi, it would have been exposed immediately.
But unfortunately, he was from Hunan, and they call their grandfather "Grandpa" there. So when he heard Yaya suddenly call him that, he thought it was their Yi dialect.
Even so, Yan Shu was frightened enough. He quickly went up to hug Yaya, and then said to Zhao Jun: "Teacher Zhao, let's go to class. Xiaoya has really troubled you these past few days."
He wanted to chat with Zhao Jun immediately to distract his attention and prevent Zhao Jun from coming back to his senses and realizing something was wrong from the "big coquettish" words.
But he was obviously overthinking it, because Zhao Jun didn't know the Jiangxi and Yi dialects, so when he heard Yan Shu's voice, he was immediately very surprised and said, "Village chief, you're back. Where have you been these days?"
Seeing that Zhao Jun was fine, Yan Shu breathed a sigh of relief and quickly said, "My wife was ill, so I took care of her for two days. I also went to the next village to call a few young men to see if we could dig another path down the mountain. You know, our village is full of old and weak people... The next village is over ten miles away, so I got back two days late."
He had already thought of the wording before coming.
Zhao Jun hurriedly asked, "Has the path down the mountain been dug?"
"No, not so fast."
"All right."
Zhao Jun didn't have high hopes, but he wasn't disappointed either.
Soon the children were taken out by the old maids who were guarding outside. Yan Shu handed Yaya to the old maid in his own house and said, "Don't worry, it won't take long."
"I hope so."
Zhao Jun sat back on his bed and said with a playful smile, "The village chief has been away for a few days, and I haven't heard many jokes. Do you want to hear new jokes from the Song Dynasty?"
Yan Shu's heart, which had been relieved, suddenly tightened again, and he turned his head to look at Zhao Zhen.
Zhao Zhen nodded expressionlessly.
Yan Shu had no choice but to bite the bullet and said, "Okay, but let me tell you in advance, don't tell jokes about Tai... Zhao... Guangyi."
"Of course I know you're a fan of Zhao Guangyi."
Zhao Jun patted his chest and said, "When Emperor Zhenzong of Song Dynasty was offering sacrifices to the gods at Mount Tai, the Hanlin Academy of Painting ordered a famous painter to create a large painting entitled 'The Emperor Offering Sacrifices at Mount Tai' as a tribute. The painter reluctantly accepted the job under duress."
After the painting was completed, a high-ranking official of the Song Dynasty came to inspect it, and the result surprised him: the picture showed a team of Song Dynasty envoys marching on the road with a carriage, and there was a city on the distant horizon.
"What is this? Who are these people?!" the senior official asked angrily.
"The envoys from the Song Dynasty sent annual tribute to the Liao Kingdom." The painter replied.
"What about that city?!"
"Shangjing, the capital of Liao."
"But where is His Majesty?"
"Your Majesty has won the battle of Danzhou and is currently offering sacrifices to the gods at Mount Tai," the painter replied.
"Well, this joke is quite funny, isn't it?"
Zhao Jun asked cheerfully.
Yan Shu turned his head and looked at Zhao Zhen.
Zhao Zhen's tense face was as hot and red as a kettle.
It seemed as if hot steam was coming out of his ears and nostrils!
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