Senku's compound pulley system is shown, as he says, off-screen, "It converts the measly strength of a high school kid into Herculean might."

Senku says, "It's called ap pulley!"

The compound pulley system lifts the tree off of Kohaku.

Senku holds up a flag and says, "We're going to build our kingdom of science."

Little did Senku know that day that his application of Archimedes’ compound pulley system would not only save the life of Kohaku but would win him over a powerful ally in the effort to rebuild civilization! #DrStone #1.6.16

Senku soaps up the road while saying, "It's an all-star team of Great Professor Senku's inventions."

Senku climbs a tree with his soaped-rope pulley system anchored to the fallen tree on the ground below.

Senku says, "This is science."

An aimage of Archimedes is shown as Senku says, "it was invented by Old Man Archimedes a few hundred years BC."

Essentially, Work = Force x distance, so to decrease the force needed, increase the distance traveled by the rope over the pulleys. FYI soap was used to reduce friction & Archimedes may not have invented the pulley but he vastly improved it with compound systems of wheels and ropes #DrStone 1.6.15

Senku pours dirt out of a pouch and into a hollowed-out column of wood, saying, "I can just barely make it with three."

Senku packs bamboo with dirt, saying, "The bamboo's barely strong enough."

Three pulley gears made of dirt-packed bamboo axles stuck through hollowed-out wooden gears with a channel carved for ropes. Senku, off-screen, says, "I'll just have to pack them with dirt."

Senku soaps up a bundle of roaps as he says, "Who would have thought that soap would be so useful now?"

Knowing the average full-grown tree is ~1 ton (1,000kg), Senku does some quick calculations. He weighs 60kg, or about 132 pounds, and needs to lift 500kg. He opts for some makeshift pulleys. A single one won’t help, but each pulley reduces the force needed by half, so he makes three! #DrStone 1.6.14

Kohaku is trapped under a fallen tree, with Senku saying, "I'd say the fallen tree weighs roughly one ton."

Kohaku is trapped under a fallen tree, with Senku saying, "To get it to one side would take half of that, 500 kilograms."

Senku pours something out of a pouch, saying, "Assuming my own weight is just over 60 kilograms,"

Senku pours something out of a pouch, saying, ", multiplied by 2 to the 3rd power to get to 500 kilograms..."

Oddly, this episode saves the practical science for the end credits! Kohaku, a descendant of modern humans who lives in the Stone World, is trapped under a tree. Slight Senku must use his science skills if he has any hope of saving her. #DrStone 1.6.13

Taiju, cheerful, says, "The petrification that's given us so much grief is what cured you, too, huh?"

Taiju, cheerful, says, "But maybe this petrification is the stone of life that replaces doctors for us."

Taiju says, "It's Doctor Stone!"

It’s the ever-cheerful Taiju who gives us another meaning for the title of Doctor Stone. We’ve already had soap named that way, but now that they realize that petrification also heals the body somehow, that name Doctor Stone certainly applies! #DrStone 1.6.12

A sign reads Laboratory in English and Japanese, as Senku says off-screen, "Believe."

Senku, exerting himself, says, "Try, try, try, try, try, try..."

A close-up of E=mc2 in blood as Senku says, "Petrification may be a fantasy,"

A close-up of E=mc2 in blood on Senku's cloak as Senku says, "... but the foundations of science are absolute."

Senku says it himself here: He knows that petrification isn’t a real status in our world, but whatever the problem is, applying the scientific method to the question will always result in a solution. #DrStone 1.6.11

Senku experiments in his workshop, surrounded by stone swallows and many jars, saying, "There's something in the stone that I was consuming in order to use my brain."

Senku experiments in his workshop, surrounded by stone swallows and many jars, saying, "Which means if I can figure out what that was, I can undo the petrification."

Senku, in a mask, makes a prepration, saying, "I really want to try nital, the industrial etching solution."

Senku, still experimenting and surrounded by his pots, says, "Too bad I don't have alcohol."

Senku knows energy isn’t free. It can be transferred between states, but it can neither be created nor destroyed. So his 2.3 TJ of energy expended had to come from somewhere. If it had been his body, he would have decomposed. Instead, the stone shell provided the energy somehow. #DrStone 1.6.10

Senku works on his lab, pouring nitric acid on the petrified swallow, asking, "Why did only I need nitric acid?"

Senku tries pouring nitric acid on the other stone statues, saying, "It's not working one millimeter on Taiju or the others."

Senku says, "The brain burns through 400 calories in a day," while a cross-section of a human brain is shown with the words 400Kcal/day

A network of blue-green neurons is shown, with Senku saying off-screen, "Over 3,700 years, that works out to 2 terajoules."

Nitric acid alone isn’t the solution. Ironically, it’s Senku’s brain power that was missing from the equation. He says the brain consumes 400 kcal/day during waking hours. Under deep anaesthesia, it’s closer to 6 kcal/hour, and a brain that’s asleep all day burns 240 kcals. #DrStone 1.6.8

Senku enters a dark, green cave. Bats hang from the ceiling. A bead of liquid drips down.

A pile of guano rises in the middle of the cave, with a liquid stream coming down from it. Senku says off-screen, "This smell..."

Senku holds his nose and says, "Nitric acid!"

Senku holds out two fingers, which hold strands of his hair and depetrified chunks of stone around them in a pool of nitric acid

While Senku puzzles that out, we see him discovering the bat cave upstream from where he revived. It’s here that he discovers the bats, their guano, and the nitric acid produced from its decomposition. It’s a clue vital to reviving his friends and rebuilding civilization. #DrStone 1.6.7

Senku revisits the scene of his revival and notices something he missed upon waking: The stone fragments nearest his head were piled on the ground. He concludes that he de-petrified head first. But since deterioration wasn’t the cause, what other process could have influenced it? #DrStone 1.6.6

Stone fragments gathered on the ground. Senku says, "The parts of the surface that happened to be less petrified reverted to cells."

Stone fragments gathered on the ground. Senku says, "That must be why there are pieces missing from the shell."

Senku, in a close-up, says, "So I wasn't revived because of deterioration."

Senku, in an extreme close-up, says, "There's some special, outside factor."

Much of the scientific method is rigorously structured, but the beauty of it comes in the moments where our minds find connections in the data. Those moments come with a rush of adrenaline. Senku saw the stone fragments but discovered that deterioration wasn’t the main factor. #DrStone 1.6.5

Senku stares at the stone fragments that had covered his body, saying, "It's the other way around!"

Senku stares at the stone fragments that had covered his body, saying, "The surface was too deteriorated to revert to living cells."

Senku stares at the stone fragments that had covered his body, saying, "That's why it turned into a stone husk."

Senku gets to experience one of many Eureka! moments here as he realizes that the stone statues didn’t deteriorate over time, but that the deterioration or surface weathering kept them as stone husks while the cells within remained alive. But how? And how does this help? #DrStone 1.6.4

Senku studies the petrified swallow and says, "Figuring out the rules is the basis of science."

Senku takes on the posture of Rodin's famous statue of The Thinker and says, "If it was deterioration, would the exposed surface have broken down first?"

A petrified statue is shown as Senku says, "But the stone statues are stone all the way through."

Senku remembers being revived from petrification and says, "the surface stayed stone while the rest of me changed back into living cells."

Senku puts those hypotheses aside for the moment and focuses on the facts available to him. As far as he knows, he’s the only one who has broken free of the petrification, so what does that mean? #DrStone 1.6.3

Senku is puzzling out what caused the petrification, asking himself, "What exactly was it that petrified all of humanity 3,700 years ago?"

A graphic featuring an alien version of Senku's head says, "Number One: Alien Technological Attack Hypothesis."

A graphic featuring a North Korean-looking version of Senku's head says, "Number Two: Some Nation's Military Weapon Hypothesis."

A graphic featuring a viral version of Senku's head says, "Number Three: New Virus Strain Hypothesis."

Senku starts his scientific method of figuring out what caused petrification by asking questions and posing three hypotheses, or proposed explanations that are tentatively assumed in order to test them. Senku poses an alien attack, a military weapon, or a viral strain. #DrStone 1.6.2

a scroll of paper that reads, "Two Nations of the Stone World," in English and Japanese

We get another solo Senku episode here, for the most part. The bulk of the episode is dedicated to Senku trying to figure out what caused the petrification and how to reverse it. Not a lot of science but a lot of scientific method! #DrStone 1.6.1

【AnimeJapanレポート】「Dr.STONE」の数少ないキュンを発表、市ノ瀬加那は小林裕介の「慎」呼びにキュン
natalie.mu/comic/news/666067

#DrSTONE #AJ2026

Kisses 💚💜

#dcst #drstone #ishigamisenku #asagirigen #sengen #lgbt #art

stanxeno as "illustration of doris day" by arthur sarnoff :3
#drstone #dcst #drstonefanart #digitalart #stanxeno

Oh hey it's @reaganmurdockvo.bsky.social , who I met at #CollectiveConFL! Such a sweet guy, from voicing in #Chainsawman to #ASignofAffection, along with #DrStone to #MyHeroAcademia too! It was great meeting him and getting my poster signed too! So awesome! #anime

I did it
#dcst #drstone #sengen

Contributor spotlight : creature._.cave ✨

#drstone #realitycheckzine #stanxeno #xenostan

Senku, having made fire, stone tools, and clothing, says, "I'm the master of science!"

Astronauts sit together in a space capsule as Senku says off-screen, "Science levels the playing field for everyone!"

See you in space, Senku! #DrStone 1.5.8

Teenage Yuzuriha and Taiju look on at Teenage Senku as he holds up a test tube and says, "I'd look for a fundamental rule that lets us all be saved."

Senku says, "I'm going to build a civilization with enough technology to take us to space."

Kid Senku reads a pile of science books, saying, "Learn everything."

Kid Senku tinkers with electronics, saying, "Try everything."

It’s clear that Senku’s exceptional childhood spent researching and experimenting has made him quite adaptable for the new Stone World he finds himself in. He’s not the biggest nor the strongest, but his ingenuity will save himself, and possibly save the world. #DrStone 1.5.7

Senku, with chert in hand, starts pulling apart plant fibers, saying, "I can unravel this like string cheese."

Senku, using his rope, makes a snare, saying, "I use ingenuity to take in everything the universe has to offer."

Senku, having trapped and skinned animals and turned their hides into leather, now has acquired food, clothing, and shelter!!

With stone tools to hand now, Senku can make all manner of other equipment. Shredding plant fibers and twining them together gives Senku rope, which he can use to make an animal snare. Given enough animals and time, Senku made clothes out of their hides. Better than a grass skirt! #DrStone 1.5.6

Senku eyes a piece of chert, saying, "I have to use the right kind of rock for the job, too."

Senku eyes a piece of chert, saying, "This colorful rock, chert, is tough as hell."

Senku works a piece of chert against a piece of flint on top of a small boulder, saying, "Nothing will work better for making a small knife."

An array of flint and chert tools are on the ground, with the words Shiny Monkey acquired Stone Tools!!

Just like in modern times, it takes the right tool for the job. Senku happens upon chert, a hard sedimentary rock used to shape or knap other stone tools. Chert found in chalk is better known as flint. The rock is actually of biological origin, the petrified remains of siliceous ooze! #DrStone 1.5.5

A pile of broken stones lays on the ground while Senku says off-screen, "There's some trick to it that I'll only learn through trial and error."

Senku smashes a piece of chert against a piece of flint, saying, "Bash the edges off mid-air."

Senku works the chert against the flint, saying, "Sharpen both sides of the edge by striking it on top of a surface."

With fire well in hand, Senku needs some tools to survive. What better tools in a Stone World than stone tools, like a hand axe? The most recognizable are probably axe heads, arrow and spear points, and knives. stonetoolsmuseum.com/stone-tool-t... #DrStone 1.5.4

Senku blows on the coals generated by his bow drill, saying, "Generating heat by using the oxidation of the gases given off by cellulose..."

Senku marvels at the fire he has created, saying, "...combustion!"

a roaring campfire with the words Shiny Monkey acquired Fire!!

Like primitive man, Senku made fire with his own hands and natural resources. Though early firemakers did not know the science behind combustion, Senku does - solid fuels burn, which produce gaseous fuels, which combust, producing heat - and he’s thrilled to have rediscovered it. #DrStone 1.5.3

Senku is passed out on the ground as he thinks of Yuzuriha and Taiju making fire more easily than he will, saying, "There's no way I'm going to start a fire."

Senku is passed out on the ground as he thinks of Yuzuriha and Taiju making fire more easily than he will, saying, "... using a primitive hand drill in Japan's humidity."

Senku crafts a bow drill to help him get a fire going, saying, "There are actually quite a few animals that use tools."

Senku crafts a bow drill to help him get a fire going as monkeys watch him, saying, "But there's only one species that uses science."

We get a glimpse of Taiju, Yuzuriha and Senku as they try to make a fire, but it’s in Senku’s thoughts as he tries to get a fire going himself. He makes a bow drill out of wood and string to generate enough friction to get a fire going. nature-mentor.com/bow-drill/ #DrStone 1.5.2

a paper scroll that reads "Stone World The Beginning"

In Episode 5, we return to the earliest days after Senku broke free from the petrification. Alone in the world, he must tend to his basic survival: food, clothing, shelter. Let’s see how he uses science to survive! #DrStone 1.5.1

Dr Xeno Houston Wingfield is showing some leather strap by spreading a part of his shirt. While holding some folder or whatever paper.

Some should learn to recognize when a bait is an actual threat.

#drstone