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[Question] [ Could two planets be tidally locked to each other at such a small distance from one another that they share their atmosphere, and material is floating around between the two? ![Artist view of 2 tidally locked planets](https://i.stack.imgur.com/fMILQ.jpg) [Answer] The Roche Limit alluded to in other an...
[Question] [ If someone wanted to construct a skyscraper (bigger being better) that would survive thousands of years *without maintenance*, what would they make it out of? It can be built from any plausible current/cutting edge/semi-futuristic materials but should be something that you can actually picture people usi...
[Question] [ **How would you design a piercing projectile (arrows, bullets, shurikens, etc) that can deliver a payload of malicious software to a computer that it is shot into?** Although it is rather silly and definitely very soft sci-fi, this is a type of weapon that shows up with surprising frequency (Avengers mov...
[Question] [ Lightsabers are really, really different from modern swords. They have weightless blades, will cut through their targets independent of velocity, and can be turned on and off fairly quickly. In light of these differences, it seems silly to expect battles between two masters of the weapon to resemble duel...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- This question does not appear to be about **worldbuilding**, within the scope defined in the [help center](https://worldbuilding.stackexchange.com/help). Closed 6 years ago. [Improve this que...
[Question] [ **This question asks for hard science.** All answers to this question should be backed up by equations, empirical evidence, scientific papers, other citations, etc. Answers that do not satisfy this requirement might be removed. See [the tag description](/tags/hard-science/info) for more information. I wa...
[Question] [ [(This *Monty Python* sketch got me thinking)](https://www.youtube.com/watch?v=WwbnvkMRPKM) Could a joke be funny enough to actually *kill* a person? By "joke", I'm referring to the written/typed and narrated types of "jokes" (videos, pictures, comedic actions don't count). **Conditions:** 1. Joke should...
[Question] [ Imagine some settlers are looking to build a castle in an area of expansive plans discover a small, isolated mesa: the formation has a very steep face, rising up 10-20m. The area of this formation just so happens to have just enough surface area for the castle they would build there. The builders would c...
[Question] [ I want to create a sci-fi story, and since galactic warfare is on a larger scale, nukes wouldn't do much damage (or I wouldn't think so anyway). I would like ideas about an ultimate deterrent that could destroy stars (or a bomb with a supernova blast radius would work too). By "to destroy a star", i mean...
[Question] [ In most fantasy settings and worlds, we have different races like Demons, Elves , Fairies, Angels and so on and on. Most of them usually have longer lifespans than humans and while it might seem like a dream come true to be able to live for thousands of years, I'm not sure that all that glitters is gold....
[Question] [ Suppose I take a troop of gorillas and modify them to have human-level intelligence. How effective would they be in a war when compared to modern human soldiers, when comparably equipped? Aside from their intelligence, these gorillas have the same body structure and dietary needs that regular gorillas ha...
[Question] [ Instead of discovering that earth was round, we find that we live on a infinite, flat "earth". What are some cultural implications if we were to live in a world like that (disregarding any physical impossibilities, and that gravity, biological/ecological systems remain roughly the same as reality). One i...
[Question] [ The unicorns would be used to charge a line of infantry with their horn. They are as big as a horse and the horn is similar to this image: ![artist’s rendition of a unicorn](https://i.stack.imgur.com/k8LTx.jpg) The infantry is a standard medieval army made mostly of soldiers wearing longsword, wooden shi...
[Question] [ Merpeople, along with other similar underwater humanoids, are often depicted as living in great cities beneath the waves. These cities have many positive things going for them: plenty of real-estate, easy to build upwards, fairly consistent weather, and lots of access to water. While these cities are oft...
[Question] [ Could underwater creatures with the intelligence of human cave men or possibly the intelligence of apes create technology (that is, more complex technology comparable to what we have now rather than simple stone age equivalents)? If so, what energy source and materials would they depend on, given that th...
[Question] [ Imagine the whole universe is a simulation. This should include also the people living in the universe (so more Simulacron than Matrix). And now imagine there's a group of hackers who knows (or suspects) that they live in/are part of a simulation, and want to hack it *from the inside.* So they try to fin...
[Question] [ Welcome to this very strange question about bedroom furniture. We've all seen the round bed in Austin Powers, and novelty beds can be round. In my Renaissance-type Earth-like world, I wanted all the beds to be round in a particular country and I started looking at beds historically. Yep. I've been resear...
[Question] [ A classic image of mermaids are their long flowing hair that swishes in the water. But in the scientifically realistic sense this makes none. The hair would be nothing more than a nuisance to the mermaid getting tangled on rocks and offering handles for potential predators, so why would mermaids evolve h...
[Question] [ I am currently building a campaign for DnD. The main plot plays out on an island the heroes are stranded on after their ship goes off track and sinks. They discover that this island is ruled by monsters that serve a mighty demon. The only humans live in a small town/city that is regularly visited by the ...
[Question] [ ## Context [Members of my race](https://worldbuilding.stackexchange.com/questions/40596/how-can-i-explain-why-my-race-has-genders-but-cant-reproduce) can live virtually infinite lives (they still have to drink, eat, and can be killed, but don't age and are immune/really resistant to disease) but are unab...
[Question] [ It's a few years in the future and society in general is fed up with hoarders; people who have a lot of money lying around that they don't use. Motivated by the rule that money should roll, they overhaul the (by now fully digital) money-system and add these new rules: * Any money you obtain has a 1 year ...
[Question] [ In a world very similar to ours, rain has a high concentration of simple carbohydrates in it, enough to sustain life on the surface. After some rainfall, this sugary rainwater is left behind and some organisms consume it while it's still dissolved. Other organisms wait for the water to evaporate and leav...
[Question] [ There's a valid discussion about feminism and objectification of women to be had. This is not the place for it, nor do I attempt to make it one. I noticed that in Fire Emblem: Fates (and probably other games and media, but I couldn't name any off-hand), several of the female characters have the seat of t...
[Question] [ Let's say I invented a [perpetuum mobile](https://en.wikipedia.org/wiki/Perpetual_motion). For real! A wheel spins, or a voltage is provided across two metal prongs, whatever, without it requiring any fuel or input of energy. Maybe it uses some not yet discovered law of physics, maybe it taps into some p...
[Question] [ This creature exists in an infinite world, a flat landscape that extends ad infinitum, where light rains from the sky from infinity during recurrent day-night cycles, and, similarly, the ground goes down continuously. All kinds of critters populate the cosmos including the skies and the underground realm...
[Question] [ I remember a character I once created who was a really good sniper. When describing him, I said he could pull off a headshot on a terrestrial target from orbit. Now, in this case it was with a laser, and it was a long time ago so I didn't know as much science as I do now, but I'd like to revisit the conc...
[Question] [ It’s just another average day in the life of modern day earth. Suddenly a transmission from orbit washes over the planet! Oh no! An alien race, calling themselves the “Thull”, has suddenly arrived in their spaceship and declares war on our race, threatening genocide! They are undoubtedly real, as anyone ...
[Question] [ In a world where the development of internal combustion engines had been seriously delayed (for whatever reason), would it have been possible to power heavier than air aircraft by steam propulsion? And would this have been a practical proposition? For example would they have been able to cross the Atlant...
[Question] [ I don't want to outright go out and say it: "Billy found the +5 magical staff *Rynn's Lament*," since a) that would [be a n00b mistake](http://tvtropes.org/pmwiki/pmwiki.php/Main/InfinityPlusOneSword) and b) my character is [not called Billy](http://tvtropes.org/pmwiki/pmwiki.php/Main/NoNameGiven). [**In...
[Question] [ If a sword were to be swung horizontally, through the torso of a human being, how fast would it need to be to not have blood on it after the swing? Assume the sword and its user are together able to cut through all of the proper bodily organs and bones in a single strike. Assume a well-forged steel blade...
[Question] [ An empire spanning the globe has a military force trained and equipped for the temporary impairment of combat forces, such as sleeping gas, shields and nets. The empire is by far the most technologically advanced on the planet, with late-Victorian technology (including armored vehicles) available in abun...
[Question] [ Inspired by a comical misreading of the title to [this question](https://workplace.stackexchange.com/questions/185756/how-do-i-politely-coexist-with-an-help-vampire), how would you politely coexist with a vampire? Vampires want blood. You have blood. You'd prefer to keep your blood in your veins and not ...
[Question] [ Imagine a "soft" kind of apocalypse - nothing like Earth being hit by an asteroid. In particular - 90% of human population have just disappeared (no matter why). So there are abandoned cities and lots of vehicles, which can be used by survivors. But the question is - **for how long?** In some TV shows, e...
[Question] [ Imagine the speed of light is 100 times that in our universe. Light from the moon takes about 1/100th of a second, the sunlight reaches our eyes in about 4 seconds, from nearby Alpha Centauri in about 16 days, and from the galactic center in about 260 years. Assuming the laws of relativity would be scale...
[Question] [ I'm imagining a system with a star and something like 6-8 planets. The planets' orbits are (relatively) close to each other, and all share an orbital period that is exactly the same. I.e. the length of a year would be exactly the same on all planets. I've even gone so far as to imagine a system where the...
[Question] [ Let us take a reasonably skilled (i.e. someone who knew their way around the boat as well as how to navigate) ship's captain from around the beginning of the Age of Sail (late 1400s to early 1500s), and teleport him into the modern world. What skills would they need to learn in order to work on a modern-...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- This question does not appear to be about **worldbuilding**, within the scope defined in the [help center](https://worldbuilding.stackexchange.com/help). Closed 1 year ago. [Improve this ques...
[Question] [ You've probably played this game before — the hero goes out into the wilderness, slaughters hordes of beasts and bandits, then returns to the town and promptly sells all his loot to the nearest shopkeeper. This is fun for a game, but it's far from realistic. A shopkeeper isn't going to want to buy 50 lea...
[Question] [ Explosives as we know them are **exothermic:** they produce heat and light, or, in other words, energy is *expelled*. Let's consider **endothermic bombs:** weapons that, upon detonation, consume heat and / or light and / or nearby electricity. --- Assuming there is sufficient funding to develop and manuf...
[Question] [ I'd like to remove the speed of light limit from my world. However I don't want to just hand-wave the consequences. How should my universe look if: * light travels at infinite speed, and so do gravity waves and magnetic fields * there is no limit to relative speed between two objects * energy cost to acc...
[Question] [ So, I have built a Time-Traveling machine. It’s a prototype, and I’ve noticed a few kinks in the machine. If the control pad gets jammed in home mode, the universe will repeat the same day for all eternity. Also, I noticed that my machine can only go back in time within a limited range. I can go anywhere...
[Question] [ What would be a situation in modern times where normal, healthy people would want to get infected by a non-curable, but **non-lethal**, virus? A virus that would have pretty nasty symptoms. There is no compensation for getting infected. The disease would **not** be easily spread, meaning that a person...
[Question] [ OK, I know the question sounds a little bit extreme, but I'm writing a story in which there are two races of a same species, both rational and civilized, with cities and everything an actual society has. Both races are pictured as educated and not prone to violence (they're nice, but serious if needed pe...
[Question] [ Set in the immediate future, mankind visits Titan, moon of Saturn for the first time. A manned space station goes into orbit around the moon once every 4-5 hours. Actually there have been many people being sent all over the solar system. Some missions are solo. Without FTL and artificial gravity why is n...
[Question] [ The setting is of 2010. No weird science nor aliens. There's this crime lord who climbed too quickly up the power ladder. He has an uncanny ability to know exactly what everyone within his range (20 kilometer radius) is doing. Anyone who comes into his range is recognized, not by name but he can tell eve...
[Question] [ **This question already has answers here**: [How to Defeat a Precognitive Warrior? [closed]](/questions/10939/how-to-defeat-a-precognitive-warrior) (27 answers) Closed 7 years ago. The community reviewed whether to reopen this question last month and left it closed: > > Original close reason(s) w...
[Question] [ The Galactic Emperor is making a new palace. He has one problem: he can't think of an expensive enough material to make it out of! At first he considered gold or silver, but those are common materials. There would probably exist enough naturally occurring gold on one planet to build the palace. He can't ...
[Question] [ **Edit:** A few people have argued that this question is off-topic, and as I write this it looks like it will be closed soon. However, I have written a new (and hopefully better) version of the question at [How could an inter-temporal banking system work?](https://worldbuilding.stackexchange.com/question...
[Question] [ I am still puzzled by the original *The Planet of the Apes* movie from the 70's. How come that sentient species invented weapons, but was unable to develop powered flight, or spacecraft. Thus, the question is: **What could prevent a sentient race from going to space?** Assume an earth-like planet, and hu...
[Question] [ I'm an alien. I made a bet with another alien, that I can: * Stay on Earth for at most 100 years. * Start a religion It may be based on existing one, but be meaningfully different. E.g. Latter-Day-Saints (Mormons) vs. mainline Protestants counts. Different versions of Anabaptism are not "different". Su...
[Question] [ Imagine that the inhabitants of Earth all follow a religion that allows only wooden weapons. How would warfare look nowadays? > > **Commandment 37.** > > > 37a) Thou shalt make weapons only from the wood of trees that grow in > the forests. No weapons of metal or other substances shalt thou make. > ...
[Question] [ Is there a plausible makeup for a lifeform which is highly resistant to even very advanced firearms (or any ranged weaponry for that matter), but can be injured more readily (albeit still a major feat) by close-ranged machinery/arms? This could be a result of the materials the lifeforms consists of, the ...
[Question] [ Human-vampire hybrid wakes up from hibernation that started in the late 30's and finds that world has changed. What kind of knowledge from the 30's would be best starting point to learn computers & networking? [Answer] The best starting point would be knowing about [Turing Machines](https://en.wikiped...
[Question] [ A common concern with immortal fictional characters like vampires and the like is the frequency with which they'd have to change their identities and move around in order to avoid people noticing how they don't age. This would require the frequent forging of legal documents, driver's licenses, etc. This ...
[Question] [ In my story I would have a completely independent and elusive group of assassins. They would not be sanctioned by either a king, wealthy merchant, nobleman or by the church. Because of that, if it turns out that the group actually exists, members would be hunted down in an attempt to shut down the organi...
[Question] [ In most stories regarding movies, games or books, the art of necromancy is often seen as a "dark" and/or "evil" type of magic. I've not really come across any characters using this type of magic for the greater good, instead villains/antagonists are often associated. A few examples are: * [Sauron](http:/...
[Question] [ # A Little Explanation I have come across many books and trilogies based on the premise of a war torn United States. The latest of these is [Burning Nation](https://rads.stackoverflow.com/amzn/click/com/054554873X) (link to Amazon page) in the Divided We Fall trilogy by Trent Reedy. This is a great book ...
[Question] [ I've looked around here a bit, but I haven't managed to find a post that really answers my question (though if there is one, please let me know). I'm trying to write a story where the two main characters decide to stow away with some travellers who come through their village annually, and I want the trav...
[Question] [ [Somewhat, not really related](https://worldbuilding.stackexchange.com/questions/6413/what-happens-if-everything-stops). In my young adult story, the main character has a mechanism that allows her to pause time, and do things while everything is frozen. I have no problem 'magic'ing the power of this mach...
[Question] [ A common trope across multiple mediums and genres is [roofhopping](http://tvtropes.org/pmwiki/pmwiki.php/Main/Roofhopping) (WARNING! Tv Tropes), where individuals are seen rapidly running and jumping between buildings as a form of travel. For the setting, consider Generic City, a sprawling metropolitan a...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/71665/edit). Closed 6 years ago. [Improve this question](/pos...
[Question] [ > > The knack lies in learning how to throw yourself at the ground and miss. > > > -- Douglas Adams. > > > Humans can't fly. Not themselves. Sure, we can climb aboard a plane, a hot air balloon, or a rocket ship. But we can't flap our arms and soar. Since we can't fly, we had to find other ways of ...
[Question] [ I was wondering about this... don't ask me why. GPS began in 1978. Were the specifications the same as today? Would a 1978 GPS device work today... and would a modern one have worked then? [Answer] Your limiting factor is [selective availability](http://www.gps.gov/systems/gps/modernization/sa/). Prio...
[Question] [ A highly advanced civilization has developed and is about to ascend to become beings of pure energy in a hyper-dimensional universe. Before leaving they restore our universe to a reasonably pristine state so that new life can evolve and explore it. For the most part they remove all trace of their existen...
[Question] [ Every species I'm aware of on earth has two sexes (with the possible exception of species which change their sexes to allow [self fertilization](http://www.britannica.com/EBchecked/topic/533390/self-fertilization)). Is it possible for a species to evolve which could have more than two sexes? How would su...
[Question] [ So let's say you live in a terrifying post-apocalyptic world. For whatever reason, this world is now infested with cockroaches the size of chickens (similar to radroaches from the Fallout games, but ignore the radiation). My question, then, is would it be better for a chicken farmer to keep on raising c...
[Question] [ It's unclear what happened. Perhaps there was a nuclear apocalypse, the one event for which the Swiss (with their 100% nuclear shelter population coverage) are uniquely prepared. But that comes with nuclear winter and other side-effects I don't want to worry about. So let's go ahead and simply assume tha...
[Question] [ It's the Great War, and all the nations are having a good time of it, painting their biplanes flashy colours, as they shoot into their own propellers! But over in the corner, lonesome and dejected, the centaur nations had no planes at all.... They can't fly anywhere, they don't get to put on goggles or g...
[Question] [ **This Query is part of the Worldbuilding [Resources Article](https://worldbuilding.stackexchange.com/questions/143606/a-list-of-worldbuilding-resources).** --- This question focuses on the initial creation of landmasses. * What are the processes that causes land-masses to form, and continents and islan...
[Question] [ During much of the Cretaceous period, oxygen levels were substantially higher than they are currently, with estimates indicating that [around 30%](https://www.npl.washington.edu/AV/altvw27.html) of the atmosphere consisted of oxygen. Obviously, this indicates that species that evolved during this time pe...
[Question] [ **This Query is part of the Worldbuilding [Resources Article](https://worldbuilding.stackexchange.com/questions/143606/a-list-of-worldbuilding-resources).** --- Whenever I draw coastlines for a map, I find myself simply drawing large curves and adding in small squiggles in between, occasionally varying t...
[Question] [ The situation I'm considering is as follows: A large research vessel with a crew of about 100-200 attempts to land on a potentially habitable planet, but *something* goes wrong during the descent. A few crew members who happened to be close to the escape pods managed to escape the ship and land nearby (a...
[Question] [ One of my [favourite stories](http://www.andre-norton-books.com/index.php/worlds-of-andre/individual-novels-by-andre/79-dark-piper) features a major fortress built on the edge of a poorly surveyed wasteland. In that context, the Butte makes sense, as a safety measure against the unknown. Once the wastes ...
[Question] [ Set in fantasy medieval times, monsters can be seen loitering around the kingdom. People discovered that the slain carcasses of these monsters contain a certain quantity of gold coins. The rest is history. It seems these monsters continually respawn, so potentially there is no limit to the amount of gold...
[Question] [ In the underwater survival game [Subnautica](https://en.wikipedia.org/wiki/Subnautica) there is a fish called **Crashfish** that, upon being too close to it, swims out of its plant to chase you and eventually explode. The explosion leaves no remains of the fish, it is completely vanished. The plant in wh...
[Question] [ **Background** I want to burn down a city completely. Nothing must remain, ashes to ashes, dust to dust. Even though I'm a supernatural being, I want this to happen in a natural way. I also want the destruction to not leave any traces that can be used by humanity 4,000 years later to identify what exactl...
[Question] [ In my fantasy world there exists an order of monks known as the Noncara/Non Cara (haven't decided which form looks better). The Non Cara practice a theology based solely on works. By this I mean: they believe in works/deeds alone. How this manifests is the Monks renounce their former selves, livelihoods,...
[Question] [ My world has a school dedicated to the teaching of magic. Nearly all parents who can send their children to the school do so. The school, as part of their teaching method, exposes their students to life threatening circumstances. They do try to intervene before it's too late, but every year several stude...
[Question] [ This excludes metal stakes, knives etc. to the heart, it's not the bleeding out that's the issue. Just for some reason, a *wooden* stake to the heart ends a vampire. Why? Assume the type of vampire that is common in fiction (can't go out during the day, doesn't like garlic or crosses, but can pass as hum...
[Question] [ Most human swearing and cursing is based on either bodily functions (notably reproduction and waste elimination) or on religion. In an alien society where there are no taboos along those lines and where there is no religion, what might take the same place as words used for emphasis? These are words to us...
[Question] [ *Disclaimer: The following question is an in-Universe question for a wip project called "The gods of ordinariness"* My friends, I am in a spot of trouble. On my daily drive to work, I have to pass a grand total of 34 traffic lights. This of course entails a lot of waiting around and in my boredom, I tend...
[Question] [ I am currently working on a setting which is fantasy but based around a soft approach to speculative biology. It is a tidally locked world with the habitable region based around the terminator between the bright hot sun side and the freezing dark, filled with terran descended flora/fauna. The main contin...
[Question] [ Imagine a world with many gods that have been in constant battle with each other. However, the gods are *exactly* equal in strength, the very nature of godhood enforces a sort of balance in their strength, meaning neither side has been able to defeat the other. The gods have been in a stalemate for a *ve...
[Question] [ The title fairly well sums up the question. We all know elves have pointed ears. Whether they be LotR style with slight tapers, or full blown foot long impracticalities, all elves have pointed ears. In a realistic context though, would there be any advantage to having pointed ears (foot long or otherwis...
[Question] [ Question inspired by a book I just finished: Dan Brown's *Inferno* Suppose I am a wealthy billionaire who wants to hide from the outside world for a year. Plot twist is, that the world's anti-terrorist organizations think that I might be wanting to use that time to create something very awful, like a do...
[Question] [ Is there anything about the decimal number system that conveys any advantages over any other number system? So is it any more likely that some other alien race would use base-10 numbers in everyday life or are they just as likely to use say... base-8 or 12 (8 fingers and no thumbs, or 12 joints in the fi...
[Question] [ [This question about time dilation](https://worldbuilding.stackexchange.com/questions/106506/time-dilation-difference-of-two-spacecraft-at-different-relativistic-speeds-if) got me thinking. The speed of an electron through copper is a whole heckofa lot slower than the speed of light, but if I understand ...
[Question] [ What is the layout (or physical arrangement) of a shantytown made of storage containers? It is meant to be chaotic, but are there *any* organizing principles I should be aware of? [![Comercial Santo Amaro, 2007 serie Favelas © Dionisio González](https://i.stack.imgur.com/NCjba.jpg)](https://i.stack.imgur...
[Question] [ There are many application of being able to communicate with the dead but in the interests of scoping I'm interested in law enforcement and sentencing. The method would be scientifically proven communication and no trick or belief required however they would be human... the dead would be just as error pr...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/824/edit). Closed 9 years ago. [Improve this question](/posts...
[Question] [ So, a lot of things happened in the 20th century. In the 1930s, the second American Revolution starts, due to the hardships of the depression. Armed revolutionaries storm DC, and the USA become the UFS. The Union of Fascist States. WWII sees both the UFS and USSR become more dystopian. ***Later 20th cen...
[Question] [ In my story, the AI on a space ship has been corrupted, causing it to try to kill all living occupants. The ship is on a collision course with a planet, and the main controls are inoperable due to the AI (crashing in to the planet happens to be the most effective way for the AI to kill the passengers, a...
[Question] [ If aliens came down to Earth and enslaved humanity, how long would it take to selectively breed the humans to make them more docile and less resistant to their alien captors? For example, if they just bred the most friendly and least aggressive humans, killing off the rebellious ones, how long would it t...
[Question] [ What scientifically would make it possible that certain large bodies of water be impassable while others that seem very similar are able to be navigated? This is not what I am attempting to do, but as an example say in some sort of alternate history no one discovered the Americas due simply to the fact t...
[Question] [ Imagine a high-fantasy magic world where magic has the place of a science. Noble/rare metals – such as silver, gold, platinum – have the ability to conduct magic energy, which is commonly used in all areas of life (imagine, for comparison, a world like ours where all energy wires must be made of gold). S...
[Question] [ Take a country in the modern day, like the U.S., which routinely makes use of weapons such as guns, artillery, drones, tanks, et cetera. Now imagine that everyone in one of its elite squads of soldiers suddenly gains the power to shapeshift into a T Rex. While in Dino-form they retain full intelligence a...
[Question] [ Recently, I asked [what could kill all humans except for those in low orbit](https://worldbuilding.stackexchange.com/questions/2625/could-a-disaster-kill-all-human-life-on-earth-but-leave-astronauts-in-low-orbi). Out of the answers that popped up ([which included the Ragnarök](https://worldbuilding.stack...
[Question] [ In my story, I have this character that cannot die and cannot grow old. She got this from a curse. When ordinary people see her, she probably looks like 20 or so. **How can I make it so that nobody knows she is immortal?** I know she can just hide in a cave or something for hundred years and then suddenl...
[Question] [ In which wilderness area on modern-day Earth would it be easiest for a lone human to survive year-round? What resources are available there and what tools and skills would be necessary? What is the approximate minimum age necessary for this person to survive there? Now. that being the essence of the ques...
[Question] [ Enter the [Insert cool and awesome Latin name here] - this species is 3 times the size of a lobster from front to tail, and a powerful hunter. Operating in swarms, they are my worlds equivalent of the piranha, except they don't really have any predators. [![Front View](https://i.stack.imgur.com/2SHv0.pn...