Episode 39

**Eyes of Science** (科学の眼, *Kagaku no Me*) is the thirty-ninth episode of the *Dr. Stone* anime, and the fourth episode of the third season.

## Summary

"Why-man" suddenly sent an eerie message to Senku and the others. Senku, Ryusui, Chrome, Gen and Ukyo, the five generals of the Kingdom of Science, began a strategic meeting to find out their true identity. In order to counter the invisible enemy, Taiju creates radar and sonar which are the eyes of science, and thinks of exposing Why-man. Having learned about the nature of the radar which can see both the sky and the sea, Chrome thinks of something...

## Plot Details

Everyone wonders from who or what that signal may be but Taiju states they should leave that to Senku and they to focus on the things they can do. Kohaku agrees too that they should leave this matter to the five most clever people in their kingdom, Senku, Gen, Ukyo, Ryusui and Chrome.

Ukyo summarizes the things that happened until now. Ryusui, however, doesn't think that the "Why-man" was the one that petrified him since it's been 3700 years since the petrification unless he had petrified himself too. Chrome wonders why they assume that Why-man is an enemy but Senku explains that if he ends being a friend, they would have just over prepared. Gen states that Why-man for sure isn't appreciating them as when Senku tried to speak with him, he ignored him and the signal stopped. Ukyo finds the situation scary as an unidentified, unseen enemy can come from anywhere. Senku then gets an idea and states they will see the unseen with the eyes of science.

    Senku takes some of Chrome's sphalerite he collected and asks the muscle group to mash them to powder. Then, in a conical flask, he then adds some water to dissolve it, creating a fluorescent paint. Kaseki guesses that they will be turning the flask in a giant vacuum tube. When they are ready and turn it on, Senku explains that they are using electrodes to accelerate electrons emitted by heat and hit the bottom of the flask, making it lights up. With this, they have obtained a cathode ray tubes display. Gen and Yo aren't impressed as Senku used to make more complicated stuff. Senku then explains that the dot will turn into an image when they nudge the beam in a precise rate, from left to right, top to bottom, which is how the old cathode ray tube TV's worked. He also shows them that using a sheet of crystal on which he applies voltage causes it to vibrate, and by using two sheets like a sandwich, the electrons passing between them make a perfect curve and turn the dot into a straight line. For the vertical curve, Senku connects the antenna to the top-bottom sandwich. Seeing the result, Ukyo is surprised that he didn't figure out earlier that this is a radar with which they will be able to see the unseen enemy.

    Senku and few others then go into the sea to test it. While looking at the sonar radar, Chrome starts to figure it and states there is something in the water. Senku laughs and explains he also wanted to make the sonar for another reason. As their voyage will be long, they need to find food locally. Ryusui then throws the net, catching a large amount of fish. Senku is thankful of Why-man as thanks to him, he now knows what they are looking for.

Back on land, Francois turns the fish into fine dishes. While they enjoy it, Kohaku is surprised that the sonar and radar can see the fish and Ryusui states that it can see anything. Hearing that, Ginro wonders if it can see through clothes, trying to explains he wonders for a scientific reason. They quickly understand what he wants to do and Senku states the closest thing to that is X-Ray, but you will see more than just through the clothes. Ginro tries to say that Chrome is also thinking it, but seeing him, Kaseki states that Chrome is probably coming up with some fun project. Ukyo wonders how will they power the radar and Senku explains that they will be using large engines that will be generating power. Kaseki gets excited to build then, however Senku explains that they will be needing a large amount of steel and oil.

    Suika and Kohaku are gathering iron at the river but the amount is too small. Meanwhile, Chrome is wondering if they can use the radar to see through dirt to find iron. He starts experimenting and quickly finds out that his experimentation works. He then runs excited to a mountain where they used to catch lighting with Senku and starts searching for iron. He ends up finding a strong signal in a cave and quickly calls Senku who sees that Chrome had made a metal detector. They find a large iron deposit and quickly turn it into a mine to harvest it. Since the iron is quite heavy, they have some trouble carrying it out and wonder how will they take it to their kingdom. Senku then states that they have hundred people in the village and will make a distribution network.

Mixing gravel and scum left from cooking oil, Senku creates asphalt and make a road from the mine to the river. They transport the iron with a car to a boat at the river which will then carry it to the kingdom. Senku also makes mine carts and railroad to carry the iron outside the mine.

## Characters

KINGDOM OF SCIENCE:

* Gen Asagiri
* Chrome
* Francois
* Ginro
* Nikki Hanada
* Minami Hokutozai
* Senku Ishigami
* Kaseki
* Kinro
* Kohaku
* Magma
* Ryusui Nanami
* Taiju Oki
* Ukyo Saionji
* Suika
* Yo Uei

VILLAGERS:

* Ruri

ANTAGONISTS:

* Why-man

PICTURED:

* Jasper
* Tetsuya Kinomoto
* Namari
* Sagara

FLASHBACK:

* Yuzuriha Ogawa

## Inventions and Discoveries

* Cathode Ray Tubes
* Radar and Sonar
* Metal Detector
* Mine
* Asphalt
* Mine Cart

## Anime to Manga Differences

* Following Chapter 97, the first five pages of Chapter 98 where the Power Team starts constructing asphalt pave roads and Gen driving the iron load to the river was placed between the scenes of Senku opening the network and Ryusui's imperial education.

## Trivia

* The episode was named after Chapter 96.