AISubs v3.5
Didn't the ninja walk on water?
The speed of the triple gold change was super fast!
This time, using science, a thorough explanation of Japanese history
That historical legend will also be realized and verified!
Can a serious white-legged bird really do it?
A legend that three arrows can't break, is it actually true?
An unexpected truth is revealed!
This time's special teacher is Jun Irabayashi- sensei
From Kyoto University, he studies everyday's little questions
He is a professor of philosophy
By the way, what do you usually study?
For example, when you go to a station or something,
when there are long stairs, you look at how much angle you can see the inside of the skirt and calculate it
You wake up in the middle of the day and calculate it, right?
The angle of the skirt?
You're a smart pervert!
You protect it, right?
That's right!
You protect it, right?
That's right!
This time, using science, a surprising truth of history will be revealed!
First, let's go with this theme!
The new philosophy of triple gold change
What does triple gold change mean?
Suzu!
Does it mean people changing each other?
Well, it's not people changing each other...
It's just a change!
That's right!
It's just a change!
Kono-san, please explain it properly!
Yes!
It's about the era of the three great generals, Tokugawa and Yemitsu, right?
Once a year, the general and the prime minister have to go to Edo.
I see!
What is it for?
Well, it's for making Tokugawa swear loyalty to him.
The prime minister's wife and children also have to live in Edo for a year.
In other words, it's like a hostage role.
Both of you are smart!
Does it mean people changing each other?
Well, it doesn't mean one of you is right.
What?
What's wrong is...
The wife and children have to stay in Edo for a long time.
Returning to Edo is prohibited.
Yes, Hazui!
I'm sorry!
Hazui, you're wrong!
Yes, answer me seriously and you're wrong!
They have to stay in Edo for a long time and the prime minister has to come once a year, right?
That's right!
Originally, there has been such a culture since the Kamakura period.
In order to show the prime minister that they are serving him properly,
they used to go to Kamakura in the past and go to Edo in the Edo period.
As I said, they stayed in Edo for a year and returned to their own country for a year.
I see!
Now, when we use science, we can find out an unexpected fact.
It is this!
The walking speed of the Daimyo line was actually super fast!
Of course, it's by foot, but the walking speed of the line was super fast!
There is a proper reason for it.
Above all, the Daimyo line depends on the size of the country and the size of the line,
but there were many lines with a capacity of more than 1,000 people.
Then it costs a lot of money.
You have to stay here and eat, and then stay and eat again.
I see, I see!
It's better to take you with you.
After all, our country is amazing like this.
I'll take you with me.
That's right.
When Yoshimoto invited a Tokyo entertainer to Osaka, was it the same as letting him go home on a day trip?
It doesn't matter at all.
It costs a lot of money.
That's what it is.
It's like you knew about it.
How fast did they actually move?
Let's use the example of the Kaga clan who arrived in Edo at an amazing speed.
Before the Kaga clan, the country was in Kanazawa,
so it was about 540 kilometers from Kanazawa to Edo.
There are mountains and valleys.
I see.
For example, how many days did they arrive in Edo for a distance that usually takes 13 days?
If you look at it, it's seven days.
Seriously, it's seven days.
It's about half of it, isn't it?
To make you feel how fast it is, if you fix it every day, it's about...
To go 540 kilometers in seven days, you have to move about 77 kilometers a day.
I see.
You can't get the hang of it yet, can you?
For example, it's twice as fast as going to a full marathon twice in one day.
They do it every week.
That's what it's about, seven days in a row.
Assuming the time you can walk in one day in an unprecedented situation as 10 hours,
the distance you can walk in one day is 77 kilometers.
In other words, if you walked 77 kilometers in 10 hours, your own speed would be 7.7 kilometers, right?
Then, Kono will experience how fast his own speed of 7.7 kilometers is.
You are fast.
I will walk up to 7.7 kilometers like this.
Wait a minute. Wait a minute.
You are fast. You are fast.
This is 7 days.
You are fast.
This is 7 days.
This is today's speed.
This is not a normal walking speed.
You are running.
This is a normal walking speed, right?
Yes.
Two thousand people are walking at this speed.
You are fast.
What does it mean?
You are fast.
If you actually do it, you will know it.
You can walk up to 7.7 kilometers in 10 hours.
If you walk up to 7.7 kilometers in 10 hours, you won't be able to run at this speed.
I see.
You can barely walk up to 7.7 kilometers in 10 hours.
Is Daimyo at the same speed?
Daimyo is...
A car?
A car.
By the way...
A person in a car can walk up to 7.7 kilometers at this speed.
And...
In the case of a person in a car...
Ouch!
Can you do it?
Stop it!
Can we talk for a moment?
Stop it!
Be quiet!
Stop it!
You got off, didn't you?
Stop it!
You can't do it at this pace, can you?
It's hard. It's hard.
It's hard, isn't it?
It's hard.
If you look it up, you can see it.
Daimyo was shaking a lot, too.
It was wobbling.
But you had to run so that it wouldn't shake, didn't you?
It's even harder when you have that kind of thing, isn't it?
In particular, it is said that Kaga-han's three- day shift was the largest in thousands of Daimyo lines at the time.
It was even more necessary to hurry up to save money, but at this time, there was another reason to hurry up.
There's a very practical reason for that.
In 1643, there was a call from Edo to Kanazawa.
My wife in Edo is about to give birth to a baby.
Hurry up and come to Edo.
So, I just hurried up at this time.
Including that, you got faster anyway, didn't you?
That's right.
Verification result.
The fastest three-day shift in Edo period was 7.7 km/h, which was barely enough speed to walk.
Now, the next theme is this.
Ninja's New Appearance.
Do you like it?
No.
Chihi, do you like ninjas?
Yes, I watch ninjas' dramas and such.
Ninjas' dramas and such?
Are there any ninjas you like?
Everyone hates me for it, but I'm a ninja who will definitely save the protagonist.
No, it's not in the drama.
It's only in the drama you like, right?
Yes, I like it.
Let's learn about it.
You like it, don't you?
Did ninjas actually exist in real life, Sensei?
Ninjas often appear in dramas and manga.
However, there are people who became models of ninjas.
For example, Hattori and Hanzo, who are famous in Edo period.
In other words, "Iga clan."
Iga clan.
Or "Koga clan."
There are people who actually existed in real life.
How about Kouyounon?
I don't know him.
Of course, those things are recorded in history.
For example, firewood used for fighting was actually used.
Or, firewood used for throwing ash into an egg.
Like a smoke bomb?
Yes, that's right.
Those things are recorded in history.
However, there weren't many ninjas who actually existed in real life.
Among them, I think you all know this tool.
This one.
Swimsuit.
This one, right?
Have you ever seen this in "Ninja Hattori-kun"?
Yes, I have.
Did you actually use this one, Sensei?
There are records of me actually using it.
However, there is no record of how I used it.
In the book "Bansenshukai" in "Ninjutsu-sho",
it was written that it was about 60cm in diameter.
But I think you've probably seen this image a lot of times,
like a ninja walking on water.
I see.
When Sensei did some research on science,
we found this fact.
Swimsuits were not a tool for walking on water.
I'm sure you have this kind of image.
But what is the basis for not being a walking tool, Sensei?
Yes, if you use science, it will become clear.
What kind of formula is this?
What is it?
I'm curious!
This kind of thing can be solved in one go, right?
Yes, it can.
I thought it would be a relatively simple formula...
Is it genuinely simple?
It's very, very basic.
So, this is the formula that proves that swimming goggles were not necessary.
That's right. I don't know at all.
It's a little difficult, but if you calculate this formula that represents the disadvantage of swimming goggles...
15 kilograms.
What does that mean?
If you put swimming goggles on your feet and go into the water, you can float if you are a person weighing 15 kilograms.
That's what it means.
Please tell me only that in the future.
No, not here.
I don't need a middleman.
It is the pleasure of a teacher to think about such things seriously.
I don't know at all.
So, 15 kilograms means that a ninja is an adult man, right?
That's right.
You know that only people under 15 kilograms can float swimming goggles, don't you?
So, let's think about how they actually used them.
Ri-chan.
When I climb a roof, I hold it with both hands like this...
It's kind of sticky...
It's like the sticky one in "Tokyo Friend Park", isn't it?
Like a suction cup?
Yes.
It's different, isn't it?
Nagisa.
It's like, "If you ride this, you'll float!"
If you let me do it, I won't float and we'll all laugh.
It's a cute item, isn't it?
An item for deceiving people?
Akari.
A float!
The correct answer is...
They used it as a float!
You can't do it like this, but you can do it like this, can't you?
That's right.
As you know, there is a 60cm diameter hole in the middle and 40cm diameter hole in the middle.
As you know, it's exactly like a float, isn't it?
When you get in the float and get in the water, you're almost sinking in the water.
It's hard to float from here.
It's about 15kg.
If you use the method I showed you earlier, you can see that there is a buoyancy that only lifts the water.
Verification result!
The water cloud used by the ninja was not a tool for walking on water, but a float.
The next topic is this!
Scientific Experiment, Fake, Real, Historia!
Next, we are going to experiment and verify lies and truths about historical famous episodes in studio.
First of all, it is this episode.
"The Legend of the Three Arrows" in Evoli Motonai.
"Are Arrows Really Unbreakable?" This is also a famous story, isn't it, Sensei?
Yes, if you are Japanese, you know most of the stories.
Do you know what kind of legend it is?
What?
You know it, even though you are in a young team.
Kate, 13 years old, please tell us.
One arrow breaks, but three in total don't break.
That's correct.
So, three people, three brothers, work together and do it, right?
It seems like you didn't know that much.
Yes.
You really didn't know?
I heard it for the first time.
You heard it for the first time? No way!
In Hokkaido, you don't learn it.
You learn it in Hokkaido.
Even if you are in Hokkaido, you learn it in Hokkaido.
So, we verified if the three arrows really don't break and actually prepared them.
Here is an arrow that was used in the Sengoku period.
The material is made of bamboo, which is a friend of bamboo.
A type of bamboo.
Yes.
For example, one of them or three of them can break.
This is the legend of Evoli Motonai.
I see.
Don't you think it can break, if you think like that?
You think it can break, don't you?
No, I don't think it can break.
I see.
This one doesn't have many arrows.
Now, there are many people who think it can break.
Sensei, please verify it.
If you try to break it from a distance, you need to calculate the bending moment.
Bending moment.
Do you use the word "moment" a lot?
I don't use it a lot.
In general, I don't use it a lot.
First of all, if you calculate the force required to break one arrow...
20 kilograms.
In other words, you need the same force as lifting 20 kilograms of things.
Then, Nomura, as an adult man, can you break only one arrow?
If you can hold 20 kilograms of things, can you break it?
Is it really possible?
Yes.
It's my first record.
No, it's not.
Don't be arrogant.
It's dangerous for your eyes.
Okay.
Can I break it?
In general.
It's hard.
If it's one, it will break.
What if it's three?
What will happen if it's three?
Let's look at it up close.
It might be dangerous if it's three.
It won't break.
It's just a hand, right?
One, two...
It won't break.
If it's three, you need three times the strength.
But if you can't lift 60kg, it won't break.
If you're strong, it might break?
Yes, if you're an athlete, it might break easily.
Nomura didn't have enough strength.
Three arrows lift 60kg.
If you're strong, you can break it.
And there's a way to break it easily.
If you try to break it with your arm strength,
your right and left arms will work in opposite directions.
For example, if you step on it with your foot,
and break it with one foot,
you can break it easily.
It's easy, right?
That's why Sanbonno-yan can break it!
Wait! Wait! Wait!
You're saying it with your arms!
Look at his illustration!
If you know about those things, you can do it in any country!
You said it! You said it!
You said it!
What's with that calculation formula?
You said it with your foot!
No, I didn't!
Look at his calculation formula!
It changes all the time!
It's broken, so it's okay, right?
No, it's not!
It's completely different!
The next topic is this!
Is it possible to do "shinken shirahadori"?
We have a katana ready for you.
Let's try it!
Let's go to Yamauchi and Kono!
Yes!
First, "shinken shirahadori"!
Please show us what it is!
Can I go for it?
Go ahead!
Seriously, think of it as "shinken"!
Yes!
Both of you!
Hey! Hey!
Stop it! Stop it!
It's an experiment! It's an experiment!
You're crazy! You're crazy!
What's wrong with you?
You...
I'm really scared of you.
I'm sorry.
You're so kind, Sensei.
I'm sorry.
If those two real ones are spinning...
That's impossible.
What do you think, Sensei?
If we calculate whether
we can do it or not,
we'll know the answer.
I see.
First of all, the Japanese sword is about 1.2 kg, about 1 kg to 1.5 kg in weight.
The Japanese sword is swung down with full force and moves forward.
While holding that exercise energy with force and stopping it,
we calculate how much it will stop, in other words, whether the exercise energy will be zero, and we will know whether we can do it or not.
Even if we stop that exercise energy of 1.5 kg that is swung down, we will know how much it will stop and where it will stop.
In other words, we can know how much exercise energy is needed when we use a calculator.
It's a little difficult, but this is a calculator that calculates the distance required to stop the swung down sword.
You know this, don't you?
Do you know it?
You know it, don't you?
I don't know it.
It's about how many centimeters you can push it in from where you stopped it.
Calculate it and say you know it.
Oh, you know it, Chihi.
Can you calculate it?
It's about 100 centimeters.
100 centimeters.
Chihi, can you calculate it?
It's about 4.9 centimeters.
4.9 centimeters.
Airi, can you calculate it?
Yes, I calculated it.
Now, how much do you think it is?
It's about 10 centimeters if you stop it here and do it.
You can push it in from where you stopped it.
I see.
If you calculate this formula, it will be like the following.
70 centimeters.
You can push it in from where you stopped it.
It's quite a lot, isn't it?
The important point of Shinken Shirahadori is that the distance between the sword and the person who stops it is 70 centimeters.
If you actually look at it...
If you start stopping it from here, the sword can stop the Japanese sword's exercise energy up to here.
Up to here?
Does it mean you can't stop it if you don't stop it up to here?
That's right.
On the contrary, if you try to stop it, you can't stop it from here.
70 centimeters.
It means you can't stop it up to here, right?
It's impossible.
You'll get cut, if you do like this.
You'll get cut here.
Like this.
So, even if you reach out, it's not 70cm.
It won't stop for sure.
That's why you can't do it seriously.
That's right.
You can't do it seriously.
Even if you stop a sword, you can't cut off your head.
So, you couldn't do it seriously?
There is a similar technique.
Let's say you have a Japanese sword.
And you don't have anything.
You can steal that sword and kill your opponent.
It's called "muto-dori".
"Muto-dori".
It's similar to "muto-dori" that Yagi Munetoshi came up with.
But you can't do it seriously like this.
I see.
There is a similar technique.
But you couldn't do it seriously like this.
If you had enough concentration, you could do it.
But you'll get cut when you stop it.
I think you didn't concentrate enough.
I see.
Let's do it one more time.
I want to see you stop it.
I think you can stop it.
It's not even 1.5kg.
Let's do it seriously.
Muto-dori
It's been a while.
Sensei is already ready.
If you make various calculations, you will run to me.
This week, we will announce "Bakako" which is not good at all.
It's a punishment game with a penalty.
Then, I will announce it.
This week's Kashiko is...
Akari!
Yes!
And this week's "Bakako" candidate is...
Chi-hi and...
Shion!
Shion doesn't learn such things in Hokkaido.
She should learn it.
She learns it.
And Chi-hi said "I like ninjas" and came forward.
But her talk content was very difficult.
This time, they will do...
Ninjin Battle - Break balloons in the laundry shop
I will do my best!
They will break balloons in the laundry shop like ninjas.
The one who breaks it first will win.
Please do rock-paper-scissors.
Rock-paper-scissors.
I won!
Which one do you want to do first?
First one!
Let's do it!
It's weak!
I see.
It's close!
It's really close!
It's close!
It's weak!
Will Shion do it next?
Yes! I will do my best!
Wow!
It bounced!
I will do it!
It's getting better!
It's getting better little by little!
Next, Chi-hi!
I will do it!
Wow!
Chi-hi won!
Please do rock-paper-scissors!
I should have seen it!
Rock-paper-scissors!
How many of the same patterns are there?
In fact, with this, your eyesight may recover!
Manabu's eyesight recovery special! Don't miss it!