Two Million Years in the Making (200万年の結晶 Nihyakuman-nen no Kesshō) is the fortieth chapter of the Dr. Stone manga.


The announcer declares Senku as the winner (and new chief), much to Kokuyo’s, the Kingdom Of Science’s and the villagers’ shock. Senku takes Ruri’s hand in marriage which causes Kokuyo to yell at him with anger. The villages become undecided confused on who to side with, as Senku had won under the ”watchful eye of God.”

Senku asks for some alcohol, which has now turned to vinegar. As he goes to prepare the Cure-all drug a villager informs him the wedding ceremony involves drinking through the night. In response to this, Senku decides he’ll need a divorce and walks of happily, which creates another another wave of shock from the villagers. As he carries the vinegar back to the lab Ruri looks out across the village - realizing she’s become the first divorced priestess.

Kokuyo goes crazy with rage, but Kinro explains to him Senku is not evil. Back at the lab Kaseki builds a strange bamboo machine that spins in the water. When asked what it’s for, Senku replies they’ll find out tomorrow and tells Kaseki to keep watch. Kaseki forces Gen to help him - much to Gen’s protest. After forcefully waking Chrome up with some Ammonia, he informs the team the drugs will be ready by tomorrow. Kohaku, Chrome and Senku collect the leftover ash on the iron making machine, which they wash with Hydrochloric Acid and mix with the vinegar.

Senku reveals they have another 25 steps to go, to Chrome‘s shock. They begin collecting materials. A curious Gen examines the Bamboo pipe and discovers Carbon Dioxide inside, prompting him to ask Senku what it’s for. When he reaches the lab, he finds (to his shock) that Senku and Chrome had caused an explosion. Senku gives an overly long explanation leaving Gen even more confused, then reveals that they are going to use the CO2 to make Carbonic Acid, which they will then mix with Sodium Hydroxide to make baking soda. By mixing the rest of the chemicals in baking soda, they compete the final step and finally finish the Cure-all.

Joyfully, the team celebrates their victory and look back on the last half a year. Gen explains he can’t enter the village to see Ruri be cured so decides to stay at the lab. As the others walk off, Kohaku feels bad for Gen after all he’d done for them. Gen miserably walks back to the lab - only to realize that Senku had secretly been making the Cola he‘d promised all this time. Over at the village, Senku gets ready to feed Ruri the Cure-all.

Characters In Order Of Appearance


  • Ammonia is a type of smelling salt, that has an extremely strong scent.

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Arcs & Sagas
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 2021222324
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156

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