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This question graduated from the [Sandbox for Proposed Questions](https://worldbuilding.meta.stackexchange.com/q/7183/47139)
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# Gravity magic - How does it work?
### (What physical law can magic manipulate in order to affect gravity?)
In my world everyone is capable of casting magic. It is possible fo... |
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I'm trying to build a setting in which humankind would have no other choice than to live underwater to survive.
Suppose there was a nuclear war in which a huge part of the human population died, and it renders the surface of the earth uninhabitable for several centuries. But people survived because they... |
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What advantages would bovines have over horses when used as cavalry?
I've got a culture whose way of life is based around cattle, and I'm wondering what kinds of advantages they might have in combat over traditional horse-based cavalry if they rode a breed of bovines specifically bred for fighting. I don... |
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The basic premise is about a metahuman whose skin always emits large amounts of heat. It's usually around 300-500 F (150-260 C) degrees, but when he gets mad, in pain or in a serious fight, it can reach temperatures of 3000 Fahrenheit (1650 Celsius).
My question is what could he do to get around this pro... |
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When it comes to naval guns, bigger isn't always better. The [46cm/18.1" guns](https://en.wikipedia.org/wiki/40_cm/45_Type_94_naval_gun) on the Yamato-class battleships didn't have much in the way of advantages over the Iowa-class's [40.6/16" guns](https://en.wikipedia.org/wiki/16%22/50_caliber_Mark_7_gu... |
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*What significant technologies would be lost in a world without "Advanced" Mathematics?* Specifically, what technologies required to get to the next level of scientific progress in an area would be lost. Your largest constraint is algebra. The humans on this world can count to small numbers, they can per... |
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What happens when two flames (whether from dragons or blowtorches) meet head on? Many films make it appears as a front where the two flames repel each other, but my intuition is that, in fact, the two flames would continue as two waves on the surface of a lake.
In short, does anyone have sufficient scien... |
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I want to develop a water-dwelling, intelligent species that could ultimately reach space.1 My question here is about the biology of such creatures.
I want my creatures to live in the water, not move onto land, but shorter outings onto land not only would be ok but would help my plot. This makes me think... |
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I'm considering a story where an exploration is devised to explore a binary system containing a black hole; the choice is [Cygnus X-1](https://en.wikipedia.org/wiki/Cygnus_X-1), with its companion supergiant star [HDE 226868](https://en.wikipedia.org/wiki/Cygnus_X-1#HDE.C2.A0226868). It would likely be d... |
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**This is my entry for the fortnightly topic challenge**
In [Day of the Triffids](http://en.wikipedia.org/wiki/The_Day_of_the_Triffids), many people go blind and the basic summary is this:
* virulent plague makes most of humanity blind
* giant, semi-intelligent plants take over.
In the world I am creatin... |
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The Wold (Forest) is one vast, interconnected, possibly digital mind. The mind is primarily built of one cloned individual of a single plant species, but there are over a dozen 'helper' sub-minds and hundreds of symbiotic plants, fungi and insects that play a vital role it its optimal functioning.
Now I... |
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I've been pondering this, and I'm curious to find out what potential issues could be created by even tightly licensed necromantic practices. Would the economy simply scale up to cover the extra workforce? Would this, essentially free, form of labour lead to a utopia of worklessness and free goods?
Edit f... |
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In speculative fiction shows like *Charmed* and *Buffy the Vampire Slayer*, characters witness firsthand the existence of heaven, perform successful seances and resurrect the dead. Despite this, however, they still act as though death is a horrible tragedy even though characters who have died outright st... |
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In my world I find it simplest to have iron-based blood. The problem is that iron-based blood is red, and I want it to be black. Two things come to mind; one is making the blood denser, resulting in thicker, darker blood and fast bleeders. The other is making blood richer in iron, which leads to black bl... |
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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.
I'm ... |
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I know the idea seems a bit far fetched but it's something I believe is common is science fiction and fantasy stories. I remember the talking trees of Zelda: Ocarina of time and of course, Tolkien's ents.
Is it possible for plants to evolve and gain the ability to think, take decisions, and communicate ... |
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Assume humanity has developed a cybernetic implant technology which allowed humans to be "advanced". The technology would be surgically implanted and provide a range of functionality (I'm not interested in cybernetics to replace damaged limbs/senses which the brain already has 'wiring' for).
An example w... |
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We have a pretty good idea of what attributes a planet would need to sustain life and one can imagine how life might develop on a planet, even in difficult environments.
I find it extremely difficult to imagine what a habitable natural satellite would most probably look like.
While it is pleasing to thin... |
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I am assuming a theocratic state as a matter of religious dogma is eternal. It has no beginning and no end. It has always been and always will be. In reality of course history has simply been rewritten to omit or distort anything that might imply that there was a time the empire did not exist.
The founde... |
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I am a writer trying to build a fantasy realm relatively similar to our world. The only difference between this world and ours was that every creature and animal was significantly larger, potentially lowering humanity's position on the food chain.
[ on the same day my arch-nemesis decides to detonate a one Megaton hydr... |
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So I'm doing some worldbuilding for a small, isolated village on the coast. The winters are harsh, but making sure everybody has enough food generally isn't an issue because they have good trade with an outside source, and they are community-led so they make sure nobody gets left out in the cold (literal... |
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Almost all of our terrestrial furniture is designed and depends on gravity. Beds to lie down in, chairs to sit down on, tables to place things on top. None of these would work in a zero-G environment.
For a hypothetical home without gravity, what would the furniture look like, and how would they work? Pl... |
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I have a colony of humans living underground in man-made catacombs on another planet. They are, essentially, digging/blasting as they go; they did not create a complete underground city first and then move in. Thus, I need for them to be able to expand "in place", without harming themselves with either f... |
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Is it possible to have a Terran-like world where the seas and oceans do not have high levels of salt?
Could, in fact, oceans and seas exist that were fresh-water?
Excuse my ignorance.
Assumptions:
* The world is roughly the same as Terra - explain any deviations required for your answer to work in detail... |
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Here are the particulars:
* Medieval era and technology
* City population is 25,000
* Arable farmland available as needed
* Ocean access for fishing
* Good sized trading hub
* Politically stable
What percentage of the population can act as a standing military long term during peacetime?
The primary role ... |
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What would be the effects of high or low gravity on human body development? How would the human body develop under a different gravity? Many science fiction stories explore the idea that people from low gravity environments would be taller and slimmer, whereas people from higher gravity environments woul... |
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I have a tendency to overcomplicate the worlds I build, to the point that it gets in the way of the purpose the world needs to meet. I put in too many characters and places, but more problematic is that I create too many connections between each element of the setting: **it's impossible for a plot to pul... |
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Let's take a world that is based heavily on [Elon Musk's specific ideas of Mars colonization](http://aeon.co/magazine/technology/the-elon-musk-interview-on-mars), to whit:
* Launch technology from Earth evolves to be to <$100/lb cost to launch ratio, due to reusable rockets
* A 1,000,000 member colony is... |
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**This Query is part of the Worldbuilding [Resources Article](https://worldbuilding.stackexchange.com/questions/143606/a-list-of-worldbuilding-resources).**
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My world is progressing. I still have a couple of days before my deadline to finish it. If I can make it in less that 7 days, the other gods wil... |
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If two circular portals of 2 meter (arbitrary) diameter were created allowing uninhibited flow between surface atmospheres of Venus and Mars, what would be the environmental effects on the two planets?
My thought process was inspired partially by both xkcd and the games Portal and Portal 2. Considering ... |
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**EDIT:** I eventually managed to find the absorption spectra of SO2 online - it absorbs in the ultraviolet range only, not in the visible light range, so the only factor affecting light transmitting through the atmosphere will be the level of sulfur vapor humidity. Sections of the question have been str... |
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In my setting, wands and staves are two of the many means by which magical creatures can harness, to a limited degree, other magical creatures' powers. When a magical creature (known as an immortal) dies, a small bead-like gem is left behind, called a soul gem. This piece of crystalized MANA (magic DNA) ... |
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In my world, there is a government agency that stops crimes before they happen, kind of like in Minority Report. However, in this case, they swoop in as early as possible, sometimes waiting outside the door as they were born. Because of this, they can't prove they stopped them because they were in the mi... |
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Magic is based on symbols tattooed onto one's body. The types and number of tattoos determine what magic the users can perform.
Since tattoos in our world are easy to obtain (especially with methods like stick-and-poke), it seems feasible that nearly everyone in my setting could have access to magic tatt... |
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In the near future humanity has started mining on Mars. International (and interplanetary) treaties governing the use of lethal weapons in space dictate that anyone possessing such a weapon must carry a license.
However, every spaceship, including single-occupant vehicles, carries some sort of ranged pe... |
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In the world I'm building, an antagonist desires to cripple humankind down to simple-living status. To do this, the antagonist has to remove all modern infrastructure. This includes buildings, electrical and informational connections, down to the electronics which run on those connections. Orbital satell... |
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Throughout history, humanity has made a few scientific blunders where a scientific principle held as fact for hundreds of even thousands of years is found to be completely or mostly false.
Our solar system is of a finite size. I have an idea based on aliens making a scientific blunder that is obviously ... |
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This is a bit of a strange one but I have an idea for a purely carnivorous species (land or water based, not determined yet) that gains awareness and even fondness of the animals they hunt. Not in the way we care for as they prefer hunting a prey species with a large population. They reached a point in c... |
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Another user's [answer](https://worldbuilding.stackexchange.com/a/104683/6986) to a recent question, specifically the way it was worded, gave me a vision I cannot shake.
Our intrepid adventurer, Joe A. Venture, is making his way through a subterranean network of caves and comes upon a small stream. He fo... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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I was inspired by geckos which can sever their own tails.
I wonder if a creature which has such an ability, especially with a high regenerative power to grow its body parts, can sustain itself over and over by only eating its own body parts, rather than as distraction like geckos do.
It may not make it f... |
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There's this idea for a story that I've been toying with, and I'm struggling with finding a good logical explanation for the main character's job.
It's a science-fiction story. No aliens; just humans. No quantum leaps from our present time in terms of technology or society, just your "normal" technical a... |
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The high speed train (HST) must be [one of the high-speed trains currently or no longer in service](https://en.wikipedia.org/wiki/List_of_high-speed_trains). **The HST should run at its max operating speed as much as possible and practicable, to save time.** HST can run at lower speeds, to abate noise an... |
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In one of the stories I'm designing, in Middle Age time, the main character, Mr. P, is a good mathematician serving the King and other lords in different works (army numbers and suppliers counts, ballistic calculations, civil and militar buildings design, etc.).
He is very good making precise calculation... |
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My setting exists on a huge vertical cliff with no top or bottom, and currently nearing the end of an steampunk-y industrial revolution, putting its tech level somewhere in the range of 1860s to 1910s. Everybody lives on relatively small and thin ledges or spaces carved out of the rock - the largest are ... |
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A brain is sort of like a computer. It stores information, has multiple processes, and can compute and calculate. I have learned in computer science intro about a program that used to be popular for DOS attacks called the LOIC. The LOIC would repeatedly send packets of data to a target computer. The more... |
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So, in my story, there is a city that gets cut off from the rest of the world. Golden translucent walls rise up on all four sides, going all the way up into the atmosphere and all the way down to the earth's core. And while most matter can pass through these walls, it swiftly becomes apparent that living... |
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The continent is split apart by a dense area of mountains, covered in glaciers. Any travelers who with to go from one part of the continent to the other would either have to cross the mountains, or go around them by boat, which brings its own set of problems many would rather avoid.
Given the adverse con... |
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In the County of the Isles, on Ironwood Island, there grow the Ironwood Trees. Ironwood is close to steel in strength, doesn't take an edge well, and is lighter than steel. The technology level of the Solar Kingdom may be taken to be approximately normal fantasy medieval, although I'm open to variations.... |
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## TL;DR: What tactics can a professionally trained army use against a horde of untrained conscripts using human wave attacks?
(This scenario takes place in the very-near future.)
**Background information:**
The two forces of SEDA and GAU have been at war for the past decade, SEDA defending against the c... |
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In Warlords it is common in the belt and asteroid colonies to "hand out" barcodes to individuals for security and labor reasons. With a simple scan the station security or guild master can see the basic bio of this person, past work and incidents, which ship they came on, etc. They are deemed more humane... |
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# Background
In a country with similar demographics to Switzerland, the gun ownership is high for the population (60 - 70 guns per hundred people) while the police force are not armed on a regular basis and have small armed police units (armed response) that will tackle gun crime.
There is a low level o... |
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There's a major interstellar war going on. Both parties are highly technologically advanced and have thousands of warships of sizes varying between 10 meters long and 1 km long.
### For both parties:
* Instantaneous transmission of information is possible, even if something is light years away. (Due to t... |
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This question is indeed inspired by [I Am Mother](https://www.imdb.com/title/tt6292852/) movie and [Horizon](https://en.wikipedia.org/wiki/Horizon_Zero_Dawn) series, but scenario I envisioned is different.
Below is the in-world intro, feel free to skip it.
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> Hello, I'm Refa. Full name: Repopulatio... |
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I'm making a mental condition that spreads through social contact. It is infectious, but having contact with someone who has it does not guarantee an infection. However, someone who is unwell might have an increased chance of infection. This may be physically or mentally unhealthy.
I'm **not** looking fo... |
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I'm thinking about an AI similar to The Machine from Person of Interest but in a generally more advanced setting, and with a likely more broad goal of serving as a shepherd for humanity as opposed to solving crimes. I'd also think it's a good idea to [follow](https://www.youtube.com/watch?v=EBK-a94IFHY) ... |
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**The Premise:**
I have this story about a medieval general getting besieged in a fortified town. The town is well fortified but the troops defending it, while enough to repel most determined attacks, are not enough to attempt a breakthrough; because of that, after several attempts by the attacking army ... |
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There are basically no non-sentient lifeforms of a size that could, and would be willing to, pull wagons from city to city.
The only lifeforms that physically could, are sapient.
Medieval, so no trains.
The only realistic alternative I see is using ships and boats.
Convenient and non-taxing transport for... |
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The human country lies on a mountain plateau. On one side, the plateau stops at the top of a cliff, after which there are a collection of stacks and a group of tabletop mountains, none of them accessible with human technology.
Harpies live on the cliffs, the stacks, the mountains, and beyond. They don’t ... |
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Disregarding how battleships are really big targets and not really viable in the modern era anymore, I would like to ask how big a battleship can be built before it starts being so large it sinks.
It doesn't have to be practical and I don't mind if sinks from a single torpedo or shelling neither does it... |
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Would a horse (trained or otherwise) not be wholly spooked by a Dragon merely flying overhead, even more so trying to enter combat with it or just trying to approach it under any circumstances?
What I understand of predator and prey creatures suggests that something that massive and formidable would radi... |
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Looking into fleshing out my world story. One of the things I had in mind was an infrequent but consistent shipment of supplies to a planet from Earth. For simplicities sake, we'll use `10` as the number of years between shipments, but this number could vary. The key is that a lot of time passes between ... |
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When I came across [this hilarious and awesome way of transportation](https://9gag.com/gag/a5RojvG) I thought "why is no one rollerblading through the woods anymore?". I am pretty sure there are more fantastic but forgotten inventions out there, or new ones like these [water bikes](https://www.youtube.co... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Evil minions also known as goblins are creatures who steal or raise children of humans to be their leaders and to guide them on evil deeds. Humans raised by goblins are intelligent and good in the art of war and they have the loyalty of hordes of goblins to their sides. A human leader is an inspiring fig... |
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In this world, a number of intelligent, sapient creatures exist. They do not have especially complex societies or technology; they live as hunter-gatherers and nomads.
The predator species isn't completely solitary. They live alone unless they have young to look after. Predators hold meetings at certain... |
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I'm trying to write a mostly realistic space story, and kind of hit a wall when it came to weaponry, so here's the question:
What would be the first weapons to be put on a spacecraft? Due to physics and complicated sciency stuff I don't understand, you can't exactly strap an AK-47 to a rocket and expect ... |
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In my fantasy story, it has come to a point in which it is completely necessary for lead to wake up at a certain time that his body is not accustomed to, however, this made me stop. It is crucial that no other character or person wakes him up, so how would he? The system of time they have in this world i... |
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Imagine modern-day Earth (or the near future) is suddenly involved in a war with an alien civilization (their advancement level is open to change).
Also, for the sake of the argument, assume that cracking the planet is undesirable (the aliens want either resources or territorial expansion).
My main quest... |
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My conculture, Sakha, is based on Puebloan culture. They live in a mudhouse, practice dry agriculture, don't wear feathers (do they? I thought they're more of Plains culture) and are matrilineal. However, the main difference is that this culture is still partially hunter-gatherer. They hunt to provide me... |
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Imagine you have the stereotypical mysterious nation across the ocean. Their mercenaries are sometimes contracted into your army. They dress weird, talk with an accent, and have really odd weapons. While you, a simple soldier, prefer a sword and shield combo, the foreigners use a weapon unlike anything y... |
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A race of complete female humanoids have DNA that is similar to humans but distinct enough to be consider a different species (think donkeys and horses). This species can mate with humans and other similar humanoids, but produce only daughters is there away to explain this biologically without the help o... |
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Ensign James wakes up on the not-enterprise. Yawns. Showers, and gets dressed ready for work. Only to discover gasp, he's out of deodorant. He walks to the matter replicator and orders a can of "not-Axe body spray". 20 seconds later, an aerosol can appears in the dispenser. And he's ready for a long hard... |
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Aliens that are weaklings and have no physical weapons as we know them, want to conquer Earth because their home planet is dying. They sow an *everybody-hates-everybody* virus throughout Earth's atmosphere. They have enough food supplies to last them for two months and then they must land and take over a... |
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I am working on a country that has been conquered by a foreign power. However, they did not manage to conquer all settlements and fortresses. In and beyond a giant mountain range at the southern border autonomous holdouts even city-states remain that are still under native rulership. But all paths to the... |
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In a book I am writing, I want there to be an mage who magically propels a dagger with a fast-acting, potent poison/venom, which kills one of the main characters. What poison that could be obtained in the mid 17th century that is fast acting should I use?
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## Poison Dart Frog's "*Lipophilic al... |
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In the waters of Iceland, the natives have their own word for a particular brand of cetaceans--"Illhveli", literally "evil whales". And the bloodthirstiest of them all is Raudkembingur, Icelandic for either "red comb" or "red crest".
[](... |
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In my world, all terrestrial bodies in the solar-system of over 900 km size have a significant human presence. Earth-moon Travel is as common as an interstate road trip, and Interplanetary travel is as common as going overseas, ranging from Venus to Earth is the same as a trip from the U.S. to U.K. today... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Working on a story right now where parasite-controlled humans essentially become the apex predators in the world, and harvest uninfected humans to further spread the organism.
These kinds of mind-controlling parasites are not that uncommon in nature. But I want to take it one step further. I want true sy... |
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I don't usually use vampires as main characters. They're normally supporting characters for more, and yet less, human immortals, but I've decided to flesh them out a bit. I was thinking about advanced, hands free [dead man's switches](https://en.wikipedia.org/wiki/Dead_man%27s_switch) for something else ... |
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A secret organization operating out of an undisclosed location for an undisclosed parent organizations have invented a "convince-me" ray gun (CMRG) that works by an unknown mechanism. After an idea is loaded in the ray gun, the gun is fired at a person or group of people resulting in 75% acceptance of th... |
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**NOTE:** This takes place in a far future earth setting.
Two AIs are fighting each other in the solar system. (Although this may be irrelevant, they cannot really leave the solar system since they lack FTL. I will explain more about this if asked).
Although they are AIs, they were trained to act as huma... |
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I'm having some trouble coming up with arms and armament for my fantasy world's dwarven race. I have a few ideas for what they could wield but I'd like a few more to really make this army feel Alive. Simply put: with the parameters I will set what are some suggested arms my dwarven race could use?
Param... |
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We all know about [Rain Shadow](https://en.wikipedia.org/wiki/Rain_shadow) - And if you don't now you do - and that the inner side of a mountain as compared to the ocean would be drier.
Now a worldbuiding problem going around that phenomenon. Imagine a large and wide valley (several dozens of miles wide ... |
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For my sci-fi world, which spans the entire galaxy, I was wondering if an advanced civilization would build a space probe to explore a star. Would it be necessary and have any scientific benefits, or is a galaxy-spanning civilization above such an experiment? Basically I'm asking- Is it worth it?
P.S. He... |
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What would be the most efficient text communication method for a spacecraft operating on a super low bit rate (I'm talking something like 5 bits an hour, excluding error handling)?
As you want both complexity (full English language and numbers) and speed (letters per day) resorting to something like Mor... |
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In alternative medieval Europe, there is a king who is (secretly) an atheist and wishes for (what we would call) a secular and humanist society. Unfortunately for him, in the same medieval Europe, the Christian Church as powerful and ruthless it was in our medieval Europe. Rest of the big picture is also... |
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I have an idea: can a moon float on the atmosphere of a gas giant, just like a piece of wood floats on the water? It is based on the following situation:
1. The density of the atmosphere increases when getting deeper to the core.
2. The moon spins inwards to the planet slowly because of some damping suc... |
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Consider an advanced species unlocks all of the curiosities of science in our universe. They spend millions of years learning every fact, every mechanism of physics, and develop a perfect "Theory of Everything" - except they're able to test it so conclusively that they know it to be fact. Regardless of w... |
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Flying is hard. Most flying species can lift comparatively minuscule amounts of mass in the air beside themselves. Flying is also exhausting, there are only so many species that can soar in the sky for hours.
But our guys are sapient, and sapience grants you many cool things, like the ability to invent t... |
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I'm working on a story in which there is some sort of planetary erosion of language. Humans lose the ability to communicate verbally (orally and written). They can remember having language, can even remember names for things and people, but they have no way of expressing them outside of themselves. They ... |
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So, on my post apocalyptic world, most people are relative homebodies compared to today. Nobody travels more than a few days distance, except for soldiers, merchants, and slavers. It’s been 500 years since the apocalypse, and my main characters eventually goes on a legendary quest, to retrieve a (insert ... |
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How could an organic, plant-like, intelligent organism move around space?
Assuming that the body is inside a small meteoroid and that outside of the meteoroid is covered in tessellating leaves to gather sunlight, to allow it to survive.
Since this organism would have to have to conserve matter any matt... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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