"Dr. Stone" is a science fiction survival manga written by Riichiro Inagaki and illustrated by Boichi, which began serialization in Weekly Shonen Jump in 2017. The first season of the anime aired from July to December 2019, with the second season scheduled to begin in January 2021. Senku, the protagonist, is obsessed with science and conducts experiments almost daily in high school. One day, Senku's friend, Taiju, summons Magari to a camphor tree to confess his feelings. Suddenly, the Earth is enveloped in a mysterious light, and all humanity is petrified. Taiju wakes up to find himself in a stone world where human civilization has been wiped out. Taiju is the only survivor in this world. Senku, a boy exploring chemistry, brings him back to life. Senku and Taiju resolve to save all humanity in this stone world where everything has been lost and rebuild civilization from scratch. This time, we'd like to introduce the many inventions featured in the series. Learning about them might just make you love science even more!
From Grapes to Wine and Brandy
If you crush grapes or raisins, put them in a plastic bottle, and leave it uncovered, you can make wine, regardless of the taste. However, it's illegal because it's moonshine. Senku tries to create nital, an industrial corrosive, to solve the mystery of petrification. He ends up creating wine to make the alcoholic beverage that will be used to make nital. He distills the wine to make brandy, completing the petrification revival liquid. Taiju, who found the grapes, is a great achievement!
Soap: The Stone of Life Made from Calcium Carbonate
Senku and his friends smashed seashells to obtain calcium carbonate. Calcium carbonate has many uses, including upgrading agricultural soil, mixing it with sand to make mortar, and making soap. It was the first scientific gadget Senku showed Tsukasa, and this soap was also used to create the dynamite that put an end to the war with the Tsukasa Empire. Senku didn't tell Tsukasa at the time, but calcium carbonate can also be used as an ingredient in gunpowder.
The Greatest Invention in Human History: Guns (Gunpowder)
To make gunpowder, mix 75% potassium nitrate, 10% sulfur, and 15% charcoal, then pound it to harden. Adding sugar as a secret ingredient increases its power. Glucose is used here. You can actually make gunpowder, so just take this for knowledge! Just hitting it with a regular stone won't start a fire, but Taiju used pyrite. Because he hit it with a stone packed with iron, it caused a massive explosion. This was the moment that demonstrated the power of gunpowder. While the gun wasn't perfected yet, the Kingdom of Science had acquired the military power of gunpowder.
Archimedes' Invention: The Pulley
Archimedes' invention, the pulley, allows even Senku's negligible strength to move a large tree. To rescue Kohaku, whose foot was trapped in a large tree, Senku used all of his knowledge and inventions to create a pulley. Kohaku was deeply touched by Senku's unwavering spirit. He says he loves Kohaku as a person, but his true feelings remain a mystery.
The Golden Spear Given to Kinro
Senku obtained a large amount of stones from Chrome's warehouse. He heated cinnabar, also known as the Philosopher's Stone, to extract mercury, then melted gold dust into the mercury to create a golden spear. His intention was to give it to Kinro, who stubbornly refused to let him into the village, and gain entry. However, Kinro's heart remained firm, believing that rules were rules. He didn't show it outwardly, but deep down, Kinro loved the golden spear (lol). It's clear from the shock he felt when the spear was shattered by lightning.
The Dawn of the Iron Age
Chrome's magnet allows them to collect iron sand. Once they've collected a large amount of iron sand, Senku and his friends begin to produce iron. Iron sand turns to iron at a temperature of 1500°C. The ridiculous task of manually raising the temperature to 1500°C in a stove is a daunting one, and Chrome and his friends learn the horrors of ironmaking. (lol) Realizing they clearly lack manpower, the Kingdom of Science prioritizes acquiring manpower. After acquiring manpower through cat-nuggling ramen, the Kingdom of Science takes shifts and produces iron.
Cat Tail Ramen
Senku and his friends make ramen from cattails to bribe the villagers. They thresh the cattails and mix them in water to separate the kernels from the rest. They use the resulting cattail powder instead of wheat flour to make ramen. The villagers, who have no experience of cooking, become obsessed with this ramen. Thus, the Kingdom of Science acquired manpower almost by force. Incidentally, Senku, who is familiar with modern food, says the ramen tastes strange (lol).
The Power Plant and the Birth of Electricity!!
Senku built a power plant from scratch during the Stone Age. Even Maboroshi was moved by this. He hammered and stretched copper sheet, then shaved it into a thin disk. He painted lacquer to cover the copper wire, attached a powerful magnet, and created a two-handed hand-crank generator. Although it was powered by arm strength, generating electricity in this era was a major breakthrough. Since two people working in sync were needed to operate the generator, Kinrou and Ginrou were tasked with running it. They looked extremely exhausted (lol). With the power plant completed, Senku created a light bulb, bringing electricity to the village.
Powerful Magnet for Generators
Senku attempts to create a high-power magnet by striking lightning on an iron rod. Lightning strikes just in time, but the lightning rod isn't ready yet. It's a race against time before the lightning strikes. Senku and his team create the lightning rod in lightning speed. They melt copper, turn it into a liquid, and pour it into a groove to create copper wire. They then wrap the solidified copper wire around an iron rod and strike it with lightning. Since there wasn't enough time to tie it to a log or something, Kohaku instead ties it to Kinrou's spear. Thanks to Kohaku's brilliant play, the Science Kingdom successfully obtained the powerful magnet. Kinrou was devastated to lose his golden spear.
Glass Saves Suika
The Science Kingdom crushed silica sand into fine sand, added calcium carbonate and roasted seaweed, and added lead to create crystal glass. Calcium carbonate was also useful here.
Senku used the glass to make glasses for the watermelon. Suika, who was extremely nearsighted due to his condition, looked very happy to be able to see everyone's faces clearly. The glasses were a big help in the battle between Kinrou and Magma!
A Laboratory Full of Proper Equipment
With the creation of glass, Senku and Chrome can now make beakers, test tubes, and other experimental equipment. Senku and Chrome struggle with glasswork. Their clumsiness annoys Kaseki, the village craftsman, and he devotes himself to glasswork. Kaseki skillfully crafts glass, something he's never seen before. True craftsmen who dedicate their lives to their work have existed in every era.
Gas Masks to Protect Against Sulfuric Acid
To obtain sulfuric acid, the most difficult material required for creating sulfa drugs, Senku and his friends head to a spring beyond the hot spring area. Poisonous gases like hydrogen sulfide and sulfur dioxide are heavier than air and accumulate in the depression where the spring is located. Since they can't obtain sulfuric acid without conquering this poisonous gas area, Senku and his friends create gas masks. They steam-roast bamboo and then dump ash scum into potassium carbonate. The resulting black powder is activated carbon saturated with potassium carbonate, which neutralizes and captures the poisonous gas. Using these homemade gas masks, Senku and Chrome embark on a highly dangerous mission to obtain sulfuric acid.
Completing the Sulfa Drug, a Panacea That Saves Ruri
After obtaining the most challenging material, sulfuric acid, the only ingredient left was sake. The Kingdom of Science, having obtained a large amount of sake in the Imperial Tournament, completed all of the extremely difficult roadmap and finally created the miraculous panacea, sulfa drug. Ruri, who had been suffering from pneumonia, fully recovered after receiving the sulfa drug, and Senku, who saved her, was officially recognized as village chief.
Dangerous Materials Used to Make Sulfa Drugs
(Hydrochloric Acid) Add a little salt to sulfuric acid and boil it. Use a water dripper to catch the resulting gas to make hydrochloric acid. If it gets into your eyes, you will go blind. (Chlorosulfuric Acid) Boil hot spring deposits and add hydrochloric acid to make chlorosulfuric acid. If you spray it on your skin, you will turn into a slimy zombie. (Sodium Hydroxide) Decompose salt water with electricity to make sodium hydroxide. It can dissolve corpses. Kohaku begins to doubt Senku as he is presented with one ultra-dangerous chemical after another (lol).
Promise with Phantom
To make sulfa drugs, carbonated water is also required. Mixing carbonated water with honey, caramelized cilantro, and lime zest completes the cola. After making the sulfa drugs, Senku makes a cola for Phantom, who is home alone in the lab. Senku hasn't forgotten his promise to Phantom. Phantom sips the cola with gusto.
The Strongest Sword of Science: The Japanese Sword
To counter Hyotsuki, who alone overwhelms the Science Kingdom's military might, the Science Kingdom completes a Japanese sword. It's no wonder that craftsman Kaseki is so enthusiastic about this mission. As expected, he was so fired up he even ripped his clothes (lol). The iron is heated to 1200 degrees, hammered to remove any debris, and then folded and heated again. This process is called "iron folding and forging." This process is repeated more than 10 times to increase the iron's strength. At this time, speed was prioritized over quality, so the folding and forging was only performed twice. According to Senku, the crystal structure is almost complete in two steps. The most important step is tempering, which hardens the tip and leaves the spine flexible. It is this difference in hardness between the two sides that makes a Japanese sword its strongest blade. Senku explains it scientifically, but Kaseki, the craftsman, fully understands the nuances.
Humanity's Strongest Communication Technology: Mobile Phones
The heart of a mobile phone is a vacuum tube, its skeleton is plastic, and its blood vessels are gold wires. The vacuum tubes are made by artisan Kaseki, the electric wires by Suika and the other children's team, and the plastic by Senku and his science team. Each trusts the other, assigns roles, and begins work on creating the parts for the phone. Once again, they have overcome an overwhelming roadmap and the Kingdom of Science has finally completed the phone. But how will the listener hear it? You need two phones to function. There simply isn't enough time to make another one. At that moment, Ruri mentions the existence of a speaker. Senku gets a hint from a hundred tales and finds a record in Byakuya's tomb. With the help of Senku and his son, the Kingdom of Science has obtained communication technology for both phones and records.
Cotton candy: A brain-shaking pleasure
Needing ultra-fine gold wire for cell phone wiring, Senku builds a cotton candy machine. Putting sugar crystals into the machine produces cotton candy, while replacing the sugar with gold produces ultra-fine gold wire. The villagers, who had never even tasted sweets before, were so overwhelmed by the deliciousness that their brains nearly melted. In the process of creating a cell phone, sweets were born in the Kingdom of Science.
A Hydroelectric Power Plant That Surpasses Manpower
Manpower inevitably results in unevenness in the ultra-fine gold wire. With winter approaching, Senku decided to create a gear using the amber shield. Chrome, inspired by the gear, worked on another project with Kaseki for three days and three nights. The finished product was a waterwheel. Senku was amazed at Chrome's ability to create a waterwheel from scratch. Using this waterwheel, the Kingdom of Science acquired a hydroelectric power plant. No one was happier than Ginrou. He and Ginrou were freed from the labor of human-powered power generation. Thank you so much for your hard work so far!
A Battery That Stores Electricity
Generating electricity would just waste away if there wasn't a storage box. Immerse two lead plates in sulfuric acid, pass electricity through them, and the electricity will automatically accumulate. The battery is complete. Ginrou doubts that electricity can really be stored in such a box, but he touches it and gets electrocuted (lol).
A Summary of the Inventions Senku Built from Scratch: The Kingdom of Science
What did you think? Senku and his Kingdom of Science have risen from nothing to modern civilization, including the cell phone. Even though he knows a lot about modern civilization, Senku is truly a genius. The recipes are exactly as they appear in the manga, so some details may be omitted. Some of the inventions are dangerous, so please keep them for general knowledge only. I can't wait to see what new inventions will appear in Season 2! !
