Dr. Stone Wiki
Dr. Stone Wiki

Two Million Years in the Making (200 (まん) (ねん) (けっ) (しょう) 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 and confused on who to side with, as Senku had won under the ”watchful eye of God.”

Senku asks for some alcohol, which is brought over by Sagan and his son Ganen. Some of the liquor has now turned to vinegar, which Senku asks to have anyway. As this is happening, Ruri starts to cough violently, spraying blood into her covering hands. Senku notes that she doesn't have much time left to spare, and decides that they must immediately start working on the antibiotics. Unmo is ready to indulge in drinking as Turquoise criticizes him. As senku is about to leave, Genbu informs him the wedding ceremony involves drinking through the night. In response to this, Senku decides he’ll need a divorce, once again leaving everyone in shock. He swiftly and happily leaves the location, dragging along his expert craftsman and Kohaku following with several large clay pots containing liquor and vinegar. The astonished villagers and Ruri observe this happen, as they departed Ruri observes that by the looks of things, she's become the first ever divorced priestess.

Kokuyo goes crazy with rage, but Kinro interrupts him with an explanation of what Senku's intentions are.

By a small waterfall, 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. The final preparation of the antibiotic begins.

To begin, Senku asks for Coal, but as suspected, they burned through Chrome's entire stash while making iron. Still, what they were after was the left over tar, which Senku collected from the chimney from the iron smelting furnace. This tar was washed with hydrochloric acid and mixed with vinegar, producing Aniline.

Senku reveals they have roughly another 25 steps to go, to Chrome‘s shock. They begin collecting materials. Kohaku was sent to dive for a sea sponge for filtration, and Suika can be seen pouring water on the condenser of a distilling apparatus. Senku and Chrome worked at the lab, until it was shaken by an explosion. A curious Gen examines the Bamboo contraption the day after, and discovers the device has made carbonated water within it. He rushes back to the lab, overjoyed by his belief that Senku is preparing a Cola drink for him. He finds the lab wrecked, Senku sitting on the floor and Chrome laying face down under the table. Senku gives an overly long explanation of the events leading to the explosion and what to do after, leaving Gen even more confused Then reveals that they are going to use the carbonic acid in the water, mix it with Sodium Hydroxide in order 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, Suika 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

Chapter Notes

  • Senku marries Ruri.
    • Turquoise and Kokuyo aren't happy because he's an outsider, but there's nothing they can do about it by their own rules.
  • Senku demands all their booze.
  • Senku divorces Ruri to get out of the celebration.
  • Senku begins making the sulfa drug to save Ruri.
  • Kaseki builds a device to make carbonated water.
  • Senku completes the sulfa drug with everyone's help.
  • Gen gets his cola.


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

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[v  e]
Chapters and Volumes
Volume 1 1234567Extras
Volume 2 89101112131416Extras
Volume 3 17181519202122232425Extras
Volume 4 262728293031323334Extras
Volume 5 353637383940414243Extras
Volume 6 444546474849505152Extras
Volume 7 535455565758596061Extras
Volume 8 626364656667686970Extras
Volume 9 717273747576777879Extras
Volume 10 808182838485868788Extras
Volume 11 899091929394959697Extras
Volume 12 9899100101102103104105106Extras
Volume 13 107108109110111112113114115Extras
Volume 14 116117118119120121122123124Extras
Volume 15 125126127128129130131132133Extras
Volume 16 134135136137138139140141142Extras
Volume 17 143144145146147148149150151Extras
Volume 18 152153154155156157158159160Extras
Volume 19 161162163164165166167168169Extras
Volume 20 170171172173174175176177178Extras
Volume 21 179180181182183184185186187Extras
Volume 22 188189190191192193194195196Extras
Volume 23 197198199200201202203204205Extras
Volume 24 206207208209210211212213214Extras
Volume 25 215216217218219220221222223Extras
Chapters not yet in tankōbon format 224225226227228229230231232
[v  e]
Story Arcs
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 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
New Stone World Arc
Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
Moon Mission Arc
Chapters 213214215216217218219220221222223224225226227228229230231232