History Fridge / DrStone

* Most of the people in the new world have an amazing physique are at the peak of their physical condition. A few thousand years of cleaner, non-polluted air might mean that everyone's metabolism is through the roof. It would also explain the crazy level of stamina Taijuu and the rest of the unpetrified people have - their metabolism is having a boost.

!FridgeBrilliance

!FridgeHorror

** Then you start getting into [[TimeyWimeyBall multiversal time theory and whatnot.]] I could definitely see Senku as the type to believe that all the people who died/are still petrified deserve a chance to live ''somewhere'' (even in another universe), even if he personally gains nothing from it. Theoretically, since causes have to be preserved for effects to happen, this would create a single, easily followable line to an outside observer: Stone World happens. Senku forms Kingdom of Science with ultimate goal of preventing Stone World. Time Machine is created. Stone World is prevented. But because Stone World was the direct cause of Stone World being prevented, it continues to exist parallel to the world in which Stone World didn't happen, but at least some people know it existed (by getting that information from Senku "objectively-previously" in the chain of events). Senku wouldn't know if it worked or not, unless the Awake World humanity that stayed awake for 3,000 years gains the ability to jump universes and comes to say thanks. This isn't too impossible, given the existence of beings like Whyman and that Awake World humanity would have 3,000 years to have negotiated with them and whatever else might be out there.

* Senku's goal of creating a time machine to change the past so that either the petrification never happens, or Earth's people are prepared for it, would by its very nature NOT WORK. While he could theoretically avoid a paradox by including instructions to create the time machine and send the information back in time, perpetuating the time loop, there is no way to prevent the Petrification while also ensuring that all of the descendants of the ISS astronauts COME INTO BEING. Even if the same couples formed among the ISS crew, their descendants would not be the same because they would have a much more diverse pool of potential spouses--one that doesn't involve inbreeding. This means that either the time loop's generating factor never existed (as Senku never had those adventures that led to allying with Whyman), or the timeline is instead split and the Senku who originally invented the time machine can never know if it works or not.

* The Stone World is ''incredibly'' lucky that the first known spontaneous revival was Senku, who is absolutely devoted to the idea of reviving all of humanity indiscriminately. Tsukasa's motivation may be kind of silly, but he is a perfect reminder of the fact that humans are naturally factional: a lot of people in Senku's position absolutely ''would'' be all for "selectively" reviving humanity. Imagine if the equivalent of Senku was a [[TheFundamentalist fanatical religious zealot]] who saw themselves as divinely chosen by God, with a holy mandate to eradicate all of the vulnerable nonbelievers so their followers can inherit the earth? Or a race supremacist who realized that this would be the ideal opportunity to literally purge every "undesirable" from Earth by hunting down and destroying all the petrified humans who don't visibly match their chosen ethnicity?

* The petrified come back to life after being unpetrified, even if they were dead before. How are they going to hide that fact when they inevitably revive humanity and it turns out some of the revived were recently deceased before being petrified and their loved ones clearly remember them dying?

* What if there were undiscovered enclaves of people? Maybe another expedition from Treasure Island? If waking from petrification happened spontaneously twice ([[spoiler:aka staying conscious until nitric acid hits you or even ending up in a cave with fermenting fruit and nitric acid - fruit bats could make accidental nitol]]), it could happen again. So when, [[spoiler:triggered by the Science Kingdom]], a second petrification wave envelops the Stone World, and Ishigami Village and Treasure Island were shown to be prepared for it. But unknown human enclaves could get shattered, wake up one at a time then starve, or stay petrified so long their food, tools, and shelter rot away.

** That's not even mentioning the number of pets, infants, and elderly folk who need constant care to stay alive suddenly not having anyone to care for them, or any way to be cared for after being turned to stone. In the first few seconds of the mass-petrification, we see a woman frozen solid while her dog is barking at her, still attached to its leash, undoubtedly dead after thousands of years after starving to death.