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[This question](https://worldbuilding.stackexchange.com/questions/30933/infinite-tube-world/31116?noredirect=1#comment82987_31116) has some close votes but has been edited/clarified, and has attracted more comments and discussion over the possible answers, and the geometry has overshadowed the actual que... |
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I'm thinking a planet orbiting a nearby star colonized by human settlers sometime in the not near, but not too distant future. How small could a planet be while still standing in as a relatively close substitute to Earth? Let's suppose the atmosphere, the climate, and the gravity would be very similar to... |
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**Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers.
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I have a planet orbiting a roughly Sun-like star, accompanied by a moon that's a bit more massive than our own Moon. The surface is about two-thirds water and one-third land, with most of the land in a large supercontinent. I'm looking to model the tides the coastal areas will experience, in particularly... |
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*Disclaimer*: This question is the first of a new series of questions of mine about *introducing hexapedae to the fauna of my conworld*. There are/will be other questions addressing i.a.: ecosystems, [evolutionary factors](https://worldbuilding.stackexchange.com/questions/56701), [taxonomy](https://world... |
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The situation is as follows: there is a city with different districts, each provided with electric power from a different power plant:
* Thermal power plant
* nuclear power plant
* Hydroelectric power plant
* Wind power plant
* Solar power plant
All the people have disappeared at the same time, in the mi... |
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I have an earth-like planet orbiting one of the stars in a binary system. I [have learned](https://worldbuilding.stackexchange.com/q/25166/28) that, for G-class stars, if the secondary star is 100AU from the primary one, I can expect the secondary star to have an apparent magnitude of about -17, about 40... |
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Is it possible for a planet to have a liquid ring rather than a ring made of solid particles?
If it is, how long would it be stable for? If not, is there any other configuration of a liquid that could form a ring such as droplets or a mist etc? Else what happens to liquids in orbit (especially liquids wi... |
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There's a [Kardashev scale](http://en.wikipedia.org/wiki/Kardashev_scale) in which Earth civilisation is at 0 (the lowest) level with all following levels being purely hypothetical and describing civilisations more advanced than human.
Is there any known anti-Kardashev scale, that describes civilisations... |
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The [NASA Vehicle Assembly Building](http://en.wikipedia.org/wiki/Vehicle_Assembly_Building) and the proposed [Nazi Volkshalle](http://en.wikipedia.org/wiki/Volkshalle) are cited to be "big enough for weather systems to form inside them".
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> The building has at least 10,000 tons of air conditioning equ... |
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[This question](https://worldbuilding.stackexchange.com/questions/416/city-in-a-hollow-tree-ensuring-realism) is about big trees that can contain an entire city.
So generally speaking:
What limits a plant's size, anything from a tree to a flowering plant?
What environment needs to exist for a daisy to ... |
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In my story, reasonably far in the future, an intrepid group of explorers are on the first manned mission to the Andromeda galaxy, travelling close to the speed of light. They slumbered in suspended animation for thousands of years, in their frame of reference (to a stationary observer, it would have bee... |
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The hypothetical world is for all intents and purposes earth or very close to it.
So what would the effects be if the magnetic field were either stronger from the start of the planet, or if the magnetic field suddenly became much stronger on a existing planet.
I already know that the planet would receiv... |
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So I have struck another snag in my draft involving my character's biology. It is an anthropomorphic animal related to the pantherinae subfamily. So far, its physical structure resembles that of a human, in exception of hands, feet, tail and the head, which I find problematic. Using a human skull as a re... |
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John is walking in the park one day, ranting to himself about stupid drivers not obeying the speed limit and roaring down his street and the stupid police not doing anything about it, when he comes across a bottle half buried in the dirt. To his surprise, when he pulls it out and opens it, a genie comes ... |
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I'm exploring this idea for a fantasy world, and I was wondering how these planets would affect each other. The system would feature orbits in all three dimensions, not relatively flat like ours is.
Assume the speed of the orbits are slightly different; assume they'd pass close by each other but not hitt... |
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If a star had a Dyson ring of some kind around it, such that to the naked eye the star wouldn't dim at all, how long would it take a civilization to reasonably see and understand the Dyson swarm, assuming it was between the planet and the star? Would the orientation of the swarm greatly change when it wo... |
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How long can a river be? Are there any physical limits on its length, coming from the necessary altitude drop, the triple point of water, or other factors? You can alter whatever parameters you find necessary for the planet that contains this river. Any pressure, continent distributions, densities, diame... |
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A staple of many games is the existence of random encounters - while traveling from point A to point B, the heroes are attack by bandits/wild animals/monsters/whatever. When defeated, the enemies will often have some kind of loot that the heroes can take with them. **How would random encounters affect th... |
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**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.
**Th... |
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During the final days of Lenin, it was time for the bolshevik party to pick his replacement. because of the way Stalin used his position as secretary to put his followers in power, Stalin was allowed to go into power and he immediately focused on keeping this power.
[Trotsky](https://en.wikipedia.org/wik... |
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Time travel works...just invented, by you. The tests prove it! Now for the human tests.
It works by poking the residual timey-wimey weebley-woobley stuff just enough for you to move yourself and your time machine to the point specified. For some strange reason, your time machine is restricted to destinat... |
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**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.
Cons... |
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Based on [an answer of mine](https://worldbuilding.stackexchange.com/a/51242/10851) from a few months ago, I've been inspired to adapt the concept to my own Life Ball. **Fair warning- this question and some of its links are not for the squeamish. May contain graphic images and descriptions not suitable f... |
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I watched a youtube video on the [Darwin IV](http://www.youtube.com/watch?v=mS3mbKvSVDI) probe mission to this planet has lower mass than the earth, about the size of Mars, and has a single sea. According to the movie, the microbes that resided in the early oceans somehow recognized that the oceans were ... |
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I want to put 10,000 humans in a space ship and send them into space. They don't have a set destination - they're having to flee their homeworld, and they don't know what planet will take them in, so they need to have a way to grow food in addition to having stores onboard. How big should this area be? H... |
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In the far future, antimatter is used for energy storage: Huge space stations with powerful solar arrays orbit the sun a bit inside Mercury's orbit, using the energy to create small amounts of anti-hydrogen (or other antimatter). This is then packaged in special containment devices and shipped to places ... |
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**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.
For ... |
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In my story I'm setting up a cold war between a faction of Fae and the Native American equivalent. The Fae are your typical Unseelie Court where one should watch their words or get bamboozled.
The Native American creatures, I assume are not that, but I've been having difficulty finding examples from any... |
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The universe so far:
If charged lepton fields are eliminated from the universe, charged pions become stable (having no decay path that preserves charge), replacing electrons to form bound "atomic" states with protons, as do free neutrons. Protium, however, is *not* stable, as it is energetically favorabl... |
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One day a small meteorite impact occurred somewhere over the Pacific Ocean, and moments later a mysterious green glow sweeps across the globe at an amazing speed.
All of a sudden everyone can hear voices and screams from somebody they didn't know, most would suffer from a severe mental breakdown but some... |
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I am working a wild wild west mixed with contemorary fantasy setting. So imagine knights in shining Armor, riding along side a train as a dragon flies over and breathes fire down.
on they have what are called Steam Rails. Big enchanted Engines that run on rails set into the ground. When you add water to... |
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**There are flying warriors wear wing suits.**
Kind of like this but with wings extending past the arms that they control with their hands
[](https://i.stack.imgur.com/Bnzmm.jpg)
These warriors do not have the technology to make guns b... |
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Through some evil scientist man's evil plot to destroy the world, he transported the entire Earth away from the sun into an unknown point in space where there is no sun. Could we recover?
Details-
* assume the transportation was instantaneous and there were no collisions with random space bits.
* Earth a... |
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A being known as Dea is the creator of all things in the multiverse. It created human beings as living batteries in order to fuel him and give him power. Dea feeds off of human worship, which he uses to get stronger, gaining power any time humans pay homage to him.
Eventually, Dea conducts a rapture-like... |
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**Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers.
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So, imagine that we're using technology that allows us to fire superheated bullets, and we decide to implement it against three types of opponents:
* **Unarmored**, wearing just normal clothes
* **Lightly armored**, the armor just lessens the impact of a normal bullet so that normal grazing shots are in... |
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Think of firearm technology similar to that of today with better materials, machining, etc. A colony of humans has discovered a way to make propellant that expands at near light speed. What advantages and disadvantages would this weapon have? What technological refinements would be required to make it us... |
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So I have a fairly large empire led by knights, and there are a lot of different households with their own proud histories and strong personal identities. As a natural consequence of this, a culture has developed where a knight's armour is often used to announce loudly who the wearer is and which part of... |
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Imagine a typical steampunk setting. Now, let's make two grand assumptions about it:
1. Steam engines here are MUCH more efficient than those in our world. Yep, we have to violate laws of physics for this one.
2. We can't use any electrical energy. To not touch physics again, let's pretend we self-restri... |
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I'm a time traveler. Yes I know it's amazing for you to grasp but once Jebsus invented time travel in the mid 54th century we all became time travelers (he open sourced it).
Now recently I came across a ring made of foreverium I would like to keep safe, said ring is one of a kind & can't be reproduced as... |
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Imagine that the taboo around Airships and dirigibles is broken. Besides some cargo, passenger and tourism Airships there's one company that focuses on the super-rich by selling what are essentially flying super-yachts.
A metamaterial skin prevents the gas from escaping the hull, meaning you'll lose mayb... |
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Imagine a creature capable of telekinesis. This creature is also armed with sharp teeth and claws for hunting and eating prey. Given using telekinesis to move an object is about as energy-consuming as picking up said object and moving it physically, why would such a creature still opt for a hunt without ... |
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We are in a world very similar to ours. But, one day, 1% of the children that are turning 10 are gaining super strength (this is an ongoing process : from that date, all the children under 10 may potentially obtain that super strength at their 10th birthday). This phenomenon is roughly evenly distributed... |
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Magic, humans are not good at magic, actually they need thousands of hours of **ACTIVE** studying.
A person needs to to put full mental effort and energy into magic studies for 1500 hours on average just to learn simple spells like lighting a fire. And those are not just a 1500 hours of repeated practice... |
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In my world a moon is reached and colonised but only in space stations for a long time. They gain the ability to reach the surface and then story happens. It needs to be something that can be bypassed so the main characters can get down to it. Some important things to know are:
* it is similar to Titan (... |
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There was an apocalypse. Humans left cities in swathes, leaving their canine companions behind in the ruined cities. My question is, which types of dogs survive?
Criteria
-The dogs are going to be left up to their own devices for the next few generations.
-The general ecosystem is the same as it was bef... |
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Let’s say we have this fictional civilisation. It doesn’t have a writing system; its traditions are oral and so is its system of government. How do you keep people accountable to what they’ve sworn? If someone said they’d give you three cows in exchange for such-and-such a service, how does the governmen... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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The community reviewed ... |
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In an isolated colony of a few hundred people, a curse has ensured that no-one is attracted to anyone who likes them. Additionally everyone does like somebody else - a different person in every case.
This means that everyone suffers from unrequited love *and* they have a stalker unwanted admirer.
The cur... |
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Now I know the cheeky answer would be "of course it's possible, it's ***your*** world, you decide what happens in it" but I'm asking this from a general point of view.
Is it really inevitable that as a civilization forms, religion and gods will always crop up whether they're real in that world or not?
Of... |
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Let me explain what I mean.
Let's say an Alien civilization left a lot of devices on a planet or moon (in our solar system or wherever). They had a colony, want/wanted to Terraform (or "Xenoform") a world, or just their ship crashed on the surface. Those extraterrestrial beings would be much more advance... |
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Thinking about the possibilities a centaur has over traditional cavalry, I was considering the fact they can be cavalry without a rider. Therefore, their backs would be free to mount something else. I immediately considered weapons.
The idea is fairly simple. You strap guns to your back or flanks, then p... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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The community reviewed ... |
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In my world, modern humans are at war with elf-like humanoids who are harmed by the touch of iron and steel. So instead of modern tools they use bio-tech and elemental magic. The human army is trying to invade but one of the elves' defenses against invasion are swarms of attacking insects. The insects ca... |
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Htrae is a planet with an abnormally strong gravity. In Htrae, the escape velocity is greater than the speed of light. Suppose a civilization like humans (call them snamuhs) evolves, with the unique ability to withstand Htrae's abnormal gravity. If the snamuhs have the ability to become as technologicall... |
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Real world stars are a mass of exothermic nuclear reactions.
But what if there were some sort of star-like astrological phenomenon that somehow underwent an endothermic reaction?
I would like to know if the existance of this 'endothermic star' could be justified. Scientific explanations are preferred, bu... |
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The setting I'm thinking of is in the not-so-distant future where humanity has become an interplanetary species using conventional propulsion. The solar system is largely colonized with human settlements going even as far as TNOs like Pluto.
Along with their settlements, humanity has brought warfare to i... |
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**This question already has answers here**:
[What technologies and sciences are needed to detect a star going supernova?](/questions/7238/what-technologies-and-sciences-are-needed-to-detect-a-star-going-supernova)
(3 answers)
Closed 6 years ago.
If our Sun was to suddenly undergo a supernova, what... |
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How could publicly accessible information proving that a public figure is corrupt go undetected for at least a year?
Assume that the public figure is a moderately noteworthy politician (equivalent to a federal Representative or Senator in the United States). This scenario is set in a democracy with full ... |
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This country has very low mortality rates and basic medicine, it is also very well-connected with a strong government and homogeneous culture and people. The country is self-providing of all resources. The army doesn't engage in massive battles and is mostly border guard and garrison.
The events are set... |
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Closed 2 years ago.
This post was edited and su... |
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Random portals of spherical shape are found on the surface of the planet, they are pitch black and have a diameter of 3 meters.
Once something enters any of the many random portals, they are "teleported" in the sky in the location right above the portal, kind of, it really works as a wormhole or gate no... |
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This is a follow up to a previous question: [How could mages regard fast magic as a form of evil?](https://worldbuilding.stackexchange.com/questions/160918/how-can-mages-regard-fast-magic-as-a-form-of-evil?noredirect=1#comment505199_160918)
There are 2 forms of magic in this world, the first of which is ... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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You are asking questions about a story set in a world instead of about building a world. For more information, see [Why is my question "Too Story Based" and how do I get it opened?](https://w... |
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I'm trying to work out what two languages merging would look like. Obviously, I know about pidgins and creoles, but these generally require the presence of a third, *dominant* language.
Here, I'm looking at a post apocalyptic world where two groups speaking close languages (Spanish and French for example... |
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I can understand that all animals would instinctively stay away from a fire, however for a fire breathing dragon to be warded off by torches seem puzzling to me. What could help explain such ironic behavior from a fire dragon?
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**Fight fire with fire.**
Remember, the fire-breathing dragon brea... |
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This settings' world is united by a world religion that all countries pay homage to. It is controlled by a priesthood who, as well as fulfilling traditional religious roles, keeps the peace between nations to prevent destabilizing wars from breaking out. This religion has seven gods, with each of them re... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Imagine a species of humanoid beings living on an Earth-like planet somewhere in the universe; they have developed complex spoken and written languages and they can study their own anatomy and the environment. Assuming they are capable to count using `0`, `1` and `many`, how can they construct any kind o... |
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I'm Superdude, I basically got all of Superman power only a 1000 times more powerful without the kryptonite weakness, problem is my powers only work at night, when the sun is out I'm a slightly below average human being (it doesn't matter if I'm indoors or there's clouds blocking the sun or anything like... |
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Mars has been colonized, close to a million people are now living above (and below) the martian soil, every few months a ship from Earth arrives with more resource for expansion and more settlers, currently the travel is one way until the martian space elevator will be completed in the near future.
Every... |
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Imagine that you're watching, say, a human (a stand-in for said entity) from a distance, and, the second you physically see them with your own eyes - ***they* do not necessarily have to see or hear *you*** - they immediately know you're there until you break eye contact.
There are caveats to this:
* If y... |
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The rot-weevil is a 10cm long flightless beetle (though not truly a weevil). It eats a wide variety of food, most of which is obtained from civilised settlements. If people wished to trap and sell this creature as food, what would they have to do the meat in order to disguise its insectoid origin, and ma... |
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Sieges are not a mystery. Bribe someone to open the gate or starve them out are the popular options. And actual assaults are not very common. Sun Tzu would even advice to
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> And the worst policy of all is to besiege walled cities. The rule is,
> not to besiege walled cities if it can possibly be avoide... |
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This question graduated from the [Sandbox for Proposed Questions](https://worldbuilding.meta.stackexchange.com/a/8413/55314)
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In my world, clothing and armor can be enchanted to grant protective effects. Clothing can be as thin as sheer silk, but still be strong enough to completely nullif... |
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I have an idea that the seas of a world are red, not blue. However, the world should also be the birthplace of an intelligent alien species. Would it be scientifically possible to have a world with a red sea and where intelligent life can still develop?
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Absolutely. [There's actually a sea on ... |
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> An energy being or astral being is a theoretical life form that is composed of energy rather than matter.
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We can kill a person by damaging his/her body physically. How about killing an energy being? You can't use a knife to stab an energy being. (Other physical attacks also don't work.)
I w... |
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Post-Apocalyptic scenario, the government is gone.
A scientist finished his greatest creation ever. A self-replicating nanobot swarm that, when dispersed in the upper atmosphere, will settle in every living creature and estabilish a self-perpetuating network for data and energy transfer.
The nanobots ins... |
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**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.
Imag... |
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In the magic system I'm developing, denser metals (like platinum or gold) can store up energy in order to fuel spells at the user's need. A weapon made of said metals would be very useful, since the wielder would be able to store vast amounts of power into it (and even place enchantments into the blade),... |
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In the scenario I have in mind, a handful of portals appear in a major U.S. city from which an army of golems starts pouring forth with the intent to cause as much damage as possible.
The specifics of this magical army aren't very important—assume they are dangerous enough to warrant a military response... |
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Though ceramic plates are harder than a math exam, and can practically obliterate projectiles, they are one-hit wonders. [Self-repairing has been demonstrated](https://www.nims.go.jp/eng/news/press/2017/12/201712210.html) for a composite of silicon carbide and aluminum oxide. I guess I should also add th... |
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In [How long would it take unused railroad rails to corrode below usability?](https://worldbuilding.stackexchange.com/q/250811/75), we are asked how long railway tracks would last, and in [my answer](https://worldbuilding.stackexchange.com/a/250817/75), I show that while ordinary steel railway tracks are... |
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Ok, since I'm *tHe* **BEaN dELiVerY mAn**, I need an appropriate weapon. I want a (you guessed it) bean gun. I want something that could launch beans at a lethal speed. However, I don't want the ammo to have to be cut into a cylinder like a spud gun. I want something that can launch the beans *whole* (ba... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Assume this is a small city of about 5,000 residents, in a modern day time period. This city isn't geographically or culturally isolated from its surroundings, and it trades often within neighboring areas (where all residents have names). I just need some sort of rationale for why the residents of this p... |
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For the purposes of this post, "word" is defined as a unit of language such that
* Has some meaning on its own, often relating to the real world.
* Complex utterances can be formed simply by transmitting multiple words.
* There are few enough words for a speaker of the language to know most of them (i.e.... |
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I want to design a creature capable of surviving long periods without drinking water, but I am not sure how that creature could store water.
These are my ideas but I am looking for something more efficient or possible:
* **Increase amount of water in blood:** Each litre of blood has almost half litre o... |
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I'm in need of the backstory on how a country was able to form and break out from a rich western and well developed country. I basically had to hit a reset switch in order for some of the future plans to work out. However I have problems seeing how this could happen without a civil or external war.
I wou... |
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Two strangers, Alice and Daisuke, are from two different cultures and speak different languages. Oh, and they are from two different times!
Alice, was unwillingly, unknowingly and unexpectedly transported through time by crygogenics/time machine/sleeping curse etc. Transport method is not needed for the ... |
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Is it possible to deduce the software being run and its uses by listening to the magnetic, electromagnetic, and acoustic signals released by its operation?
Computers generate minute acoustic noise, variations in magnetic fields, and electromagnetic waves during operation. Typically much of this 'noise' i... |
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Inspired by the [Paycheck](https://www.imdb.com/title/tt0338337/) and [Minority Report](https://www.imdb.com/title/tt0181689/?ref_=fn_al_tt_1) movies.
So far as I can tell, physical time travel is impossible for humans, and so I searched to see the future possible scientific or theoretical possibilities,... |
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Is it possible for there to be a planet where no animals, only plants existed? What evolutionary reasons would cause this, if possible?
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The Earth had life without multicellular animals for [roughly three billion years](https://www.astrobio.net/origin-and-evolution-of-life/multicellular-life-e... |
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Spiders produce silk, a protein fibre able to construct webs and dens. But is there an existing animal (preferably a vertebrate) that would be able to evolve a similar ability of producing a silk-like fibre?
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The [edible-nest swiftlet](https://en.wikipedia.org/wiki/Edible-nest_swiftlet)
fits t... |
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Overall, our current non-lethal weapons are fairly poor. The human body is pretty good at maintaining consciousness, especially in a high-stress situation. The best we have right now are electroshock weapons, such as the Taser, which are usually short range, somewhat unreliable (they have to connect with... |
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In the lore for the book I'm working on, what basically happens is a ship full of Byzantines is expelled from their homeland on a ship and winds up on a small continent (think something around the size of Australia) full of people descended from earlier Mongol and Zulu arrivals. Over the next two or thre... |
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Usually, forms of life are associated with *organisms* like humans, plants and animals. The probability that such can evolve in an environment is very low due to the many constraints that have to be fulfilled, e.g.
* Planets have to be in a habitable zone.- planets require an atmosphere to shield cosmic ... |
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In my world, people live in a swamp where the ground is consistently covered in at least 4-5 in of water and occasionally higher, reaching up to the knees.
My Question is what kinds of medieval style footwear could my people wear that allows them to walk and **specifically run through the water** with li... |
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