Episode 23

**Wave of Science** (科学の波, *Kagaku no Nami*) is the twenty-third episode of the *Dr. Stone* anime.

## Summary

Senku unveils the pile of tungsten for final preparation. After being crushed into a fine powder, it needs to be heated at an extremely high temperature for it to become usable. While Senku readies the tungsten powder, he charges Chrome and Kaseki to create a method of pinpoint high-temperature heating using everything they've learned since Senku's arrival in the village. Once the tungsten filament is created, everyone splits into groups to complete the remaining tasks: Suika and her friends finish twining the gold wire; Senku and Chrome create the necessary plastic; Kinro, Ginro, and Kohaku burn coal for its ash and make a microphone; and Gen and Ruri create zinc-carbon batteries. They all finish their tasks and Senku puts it all together, creating the first modded cell phone in the new world.

## Plot Details

    Having obtained tungsten, Senku's goal is closer. While he comments they need to extract it, Magma starts smashing it and Senku confirms that is a way. As they turn it into dust, he will use chemistry and make it in a toothpaste state. To get rid of the rust, they will place it into a glass and with hydrogen and warm it up to 1000 degrees. Kaseki and Chrome find that easy, but Senku reminds them that glass will melt at 700 degrees and will need a pinpointing heating mechanism to just warm the tungsten inside. Senku decides they split work and he will be doing the toothpaste. Chrome wonders who will be doing the heating mechanism and realizes that Senku intends to let him think of it and create it. Kaseki recalls how he was making everything himself and wish he had a maker buddy too. Chrome states he has two and points to him and Senku, making Kaseki happy.

Senku pulls Gen to assist him in chemistry as a modern person, he must know a bit at least, which is more than the villagers. Meanwhile, Chrome uses everything he had learned from Senku to create a pinpointing heating mechanism. Little by little he increases the heat and reaches 1000 degrees, but recalls Senku stating the warmer is, the stronger tungsten will be, he decides to continue and increase the heat.

    Senku finishes the toothpaste and Chrome states he is done too. However, Senku is surprised of what he had build as its too big, but it thinks it may be for the better as it will involve everyone in working on it. They successfully manage to create tungsten filament.

    In the next step, Senku isn't sure Kaseki will be able to make the glasswork they need as its a bit more complicated. Kaseki doubt it, but as he sees the blueprint, he is shocked. Senku wants Hickman pump, a vacuum pump. Gen tries to fire him up, stating that only the most talented craftsmen were able to build that pump and there is age difference as well. Kaseki explains complicated things excite him, but he wants to get a high five as maker buddy like Senku and Chrome did. Senku agrees and leaves the pump to him. Kaseki takes Gen to help him out. Meanwhile, Suika and the kids decide to help by making the wire. Senku and Chrome proceed in making plastic using chemistry and makes formalin. Seeing the kids and older people having hard time working in the cold and needing coal ash, he turns to Ginro and Kinro. Chrome leads them to get some coal, while Senku works to make a heater. He creates heaters for each house, and while they burn the coal, the villagers can stay inside and work in the warm houses. Seeing that, Kokuyo confirms to himself that making Senku the chief wasn't a mistake.

Senku wants zinc-carbon batteries and tasks Gen with making them. He provides him the materials and instructions and Gen starts to work. Gen happily sings while he works, surprised by how easy the work is, until he learns they need 800 which crushes his soul.

     For making microphones, Senku takes the crystal formation in wine barrels, mixing them with some seaweed in hot water, he gets Rochelle salts, which can turn sound into electricity. Adding them to a plastic megaphone, would create a microphone. Working together, they manage to finish all tasks and create a cell phone.

## Characters

KINGDOM OF SCIENCE:

* Gen Asagiri
* Chrome
* Ginro
* Senku Ishigami
* Kaseki
* Kinro
* Kohaku
* Magma
* Suika

VILLAGERS:

* Kokuyo
* Ruri

ANTAGONISTS:

* Hyoga
* Homura Momiji

FANTASY:

* Tsukasa Shishio

## Inventions and Discoveries

* Tungsten Filament
* Hickman Pump
* Metal Fireplace
* Manganese Batteries
* Rochelle Salts
* Cellphone

## Anime to Manga Differences

* Good Morning World! is used as background music.