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Trying to come up with a poison that could be applied during a massage by a person wearing gloves. Ideally the effects are mild and slow acting enough it takes a number of sessions to kill the person. Ideally not too suspicious, begging for an autopsy. Could also be that the victim has a pre-existing med... |
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Imagine I had a sophisticated gun that is capable of producing a micro blackhole on contact with a target, that blackhole is designed to be completely evaporated as hawking radiation in exactly 1 second so I wonder would it devour the being and consume everything in it's path or create a powerful blasts ... |
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I want to write about an object that won't be pierce-able even with the fastest of arrows (notice I didn't mention guns, only arrows) but that can somehow be crudely cut by an albeit very razor-sharp weapon (say something as sharp but as brittle as obsidian which is 3 times sharper than diamond and betwe... |
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One popular theory to explain how Earth got its water is that it was delivered by asteroid/comet/etc. The form this theory usually takes is that many small impacts occured over a long time, each delivering a relatively small amount of water until the planet reached its current water content.
But what if... |
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I am wondering if scientifically it is possible to cauterize a wound using molten metal.
I was thinking of a character whose wounds and scars were healed with metal, leaving her with spots and streaks on the skin that was cauterized.
The book would take place in a sci-fi, futuristic world.
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T... |
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So I read recently [this article](https://dothemath.ucsd.edu/2011/11/mpg-of-a-human/) as I was trying to design a sci fi alien race for my story and I found out that a human only has an efficiency of converting food to energy of about 25%. What would happen if somehow through a fluke of biology this alie... |
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Imagine a situation kind of like *Zootopia* with many different creatures all living in one environment, some significantly larger than others. These species aren't necessarily furries like in *Zootopia*, but you still have size difference such as an elephant vs. a mouse where one species is a hundred ti... |
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I have been drafting the concept of a future world based on current research. I have been contemplating the long lasting transportation tunnels of the future. I am asking about the likelihood of the following building method:
Notes:
Granite is abundant and has extremely high strength and durability.
N... |
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Orgone is the measure of a person's connection with the cosmos. It is the conduit through which the power of the cosmos flows, focused through a sorcerer's will. Ritual practicioners must draw on this reserve of power to make a magic spell work. Spells require a constant infusion of Orgone through ritual... |
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I have a character who bills himself as an explosives experimenter. He wants to try something new with explosives.
He knows how to make a [bolas](https://en.wikipedia.org/wiki/Bolas) and has the materials to make one. However, he has this idea to make the simple bolas a little more dangerous.
In place of... |
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# Background
This is a Terror Bird:

Specifically, this is [*Titanis*](https://en.wikipedia.org/wiki/Titanis) one of the largest of the carnivorous [Phorusrhacidae](https://en.wikipedia.org/wiki/Phorusrhacidae); it was perhaps 2.5 meters tall and 150 kg.
I would li... |
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This may be an obvious question, however I can't find an obvious answer. **Is rapid premature aging something we can assume is painful?**
I'm not talking about 'natural' diseases such as progeria but rather being hit with an aging spell in a magical universe.
Drastic age changes in the space of a few min... |
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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.
The ... |
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Can firearm propellant be ignited by piezoelectric crystals that are activated by the trigger? This is for use in a world 50 years into the future similar to Earth. The people there are gearing for war and want to mass produce firearms with as few moving parts as needed without compromising their effecti... |
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An ideal punishment for evil scientists or geniuses would be a judicially mandated, deliberate decrease in intelligence. Let's say that a judge ordered a person's IQ to be decreased from 200 to 110. How would the sentence be carried out?
Note that the sentence does not mean turning a genius into an idiot... |
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A fellow from the near future is sent on a mission to ancient Greece where he needs to impersonate Zeus. What kind of device would best approximate the mythical bucket of thunderbolts? Also, style matters - Zeus-impersonator needs to look appropriately god-like in a toga in a storm while throwing his bol... |
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In order for different humanoid races (humans, elves, orcs, dwarves..) to evolve, they need to be separated for a long time, in different environments. However, if all races are supposed to be sentient, their common ancestor must have been sentient. If we take this as the point where humans have become b... |
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Suppose a mad engineer needs the world destroyed by next Tuesday. For efficiency's sake, he considers "Gray Goo," a hypothetical end-of-the-world scenario in which self-replicating machines devour the entire planet while building more of themselves.
Realistically, **what would be required** (in terms of... |
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Given advanced enough telescopic technology, would it be possible to detect that a planet in the order of 50 light years away is inhabitable? (i.e. without having to actually go there)
I'm just looking for the basics here - presence of water, enough oxygen in the atmosphere, temperature, and sunlight (pe... |
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Since I asked these questions [If magic is real, can it be true that rational scientific thought should exclude it?](https://worldbuilding.stackexchange.com/questions/13364/if-magic-is-real-can-it-be-true-that-rational-scientific-thought-should-exclude) [Science, Religion, Magic: Can they be maintained i... |
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As water guns today can send a jet of water quite a distance away, I wonder how useful would a gun be, that sends an electric current over a jet of water to its target?
By useful I mean:
1. Gotta be able to replace/complement standard small arms, in terms of range, firepower, others. I'm actually looking... |
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I am mad scientist and I captured Average Joe, who is not average only in one remark: He is person [not to be missed](https://worldbuilding.stackexchange.com/questions/23146/how-many-humans-can-i-abduct-without-getting-noticed) (I double checked). Otherwise he is healthy male, around 30 years old, with n... |
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So, it's easy for me to imagine how a [Lich](https://en.wikipedia.org/wiki/Lich) or Vampire or something similarly considered to be intelligent and persuasive and powerful and immortal could control a kingdom that is spreading across continental divides; however, it's difficult for me to think of a way t... |
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What internally consistent time travel rules would make for an interesting world to model and explore in a game or a book?
I exclude the "no free will" setup (where everyone is pre-destined to behave in a way consistent with past events if they travel in time); it seems quite boring.
I also exclude the e... |
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Inspired by a certain @KSmarts , [based on a previous question over here, which talks about a kingdom with a super grasstato plant](https://worldbuilding.stackexchange.com/questions/10692/are-there-any-good-uses-for-infinite-grass-and-potatoes).
So, the kingdom is absolutely overflowing with potatoes, an... |
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I've read that a triple stage combustion light gas gun can fire for a muzzle velocity of 12km/s. That's faster than the escape velocity needed to escape earth's gravitational influence.Thus, im going for this speed value.
Suppose a 155mm CLGG fires a tungsten projectile at a target below at a speed of 12... |
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Ok, so I have this world(or maybe it will just be a dimension depending on how things pan out) called 'The Weird' that has air in space, like Earthlike air(for the most part). Also, the 'planets' or worldplanes are pretty much flat(barring mountains and the like), at least at the top. It should be noted ... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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Closed 1 year ago.
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Imagine someone claimed she was from Mesopotamia, one of the earliest civilization and had time travelled 5000 years into the future which is now our current modern day, she was completely naked so how can we scrutinize her using existing science and technology to find out if she is a fraud? Can we compa... |
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**Closed**. This question needs [details or clarity](/help/closed-questions). It is not currently accepting answers.
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As far as it is known, **Relativistic Kill Vehicles** are a common weapon in science fiction and are rendered as powerful as nukes just due to their kinetic energy alone, a finite mass being propelled at a portion of lightspeed.
<https://hackerfall.com/story/relativistic-kill-vehicle>
[. If plotted, this w... |
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Say a group of people travel to a different planet where they have to wear spacesuits to live (because there's no oxygen and because of the atmosphere's density).
What would happen if they planted trees from earth in a greenhouse on this new planet, completely sealed, with all the conditions necessary fo... |
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Can we create any electrical equipment which works in the opposite way to a bulb, such that is whilst it is switched on all the light in the surrounding area gets absorbed creating darkness?
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Maybe possible in theory, but not plausible with any foreseeable technology.
Light is a torrent of ele... |
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One military has developed insects with strong jaws capable of chewing through the weaker parts of CBRN (Chemical, biological, radiological and nuclear defense) gear and then injecting neurotoxins into their enemies' bodies. These insects would be deployed through cluster munitions, IED (improvised explo... |
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My question is simple. What would people in England in 1700 think of a modern, history loving, 12-14 year old girl? This particular girl was a case of time travel gone wrong. A school trip meant to be observational only and mostly simulational where the travelers aren’t physically there fails and leaves ... |
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I am currently exploring the idea of writing an SF / alternate history series that inserts kaijus into historical events. Specifically, I'm looking for **unexplained or strange historical events** that have remained mysterious in nature. Ideally, **I'd also like answers to avoid the 20th-21st centuries**... |
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**This question already has answers here**:
[What percentage of a population can be part of a medieval military?](/questions/20826/what-percentage-of-a-population-can-be-part-of-a-medieval-military)
(7 answers)
Closed 5 years ago.
I'm working in a low-fantasy setting of roughly mid-Renaissance dev... |
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I'm building a science fiction setting for a space combat game, one in which players would be in the cockpit of a starfighter or bomber.
Unfortunately, reality says they would be vaporized by a laser-based point defense system before they could see any enemy ships.
I've been trying to work out a means to... |
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My first question in this forum so if I have made a mistake I apologize in advance.
My World is Earth, but it's changed based on the following four premises.
1. In 1000 AD a virus killed 90% of all males of every animal species.
2. The females were immune but benefited with longer lifespans (four to fiv... |
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Suppose there was an alternate reality where humans had focused on their space program and everyone worked together to colonize the solar system all the way out to Jupiter in the 1950s. Many years have passed since then and it is now 2016, earth has smart phones and a the tech you would expect in 2016, b... |
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An interstellar civilization has superluminal travel which allows for travel between two points, effectively without traversing the space in between so they don't crash into anything between them and their target.
Navigation presents a problem: the visible stars only give a snapshot of their positions ye... |
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After reading that [sweet](https://worldbuilding.stackexchange.com/questions/53703/how-would-aluminium-work-as-medieval-armor) thread, I had another question in mind.
I read somewhere that at first, when countries started to design sailing ships with metallic armor, they were doing it with a mix of coppe... |
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The question is about enmity between 2 different races that are different in their ideology, physic and abilities. It is not about the political issues or indifference that may arise within a society.
The dragons are not very massive as seen in other stories, here they are of the size of a grown up horse... |
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In [Weaponizing the return-energy channel of a one-way portal](https://worldbuilding.stackexchange.com/q/242517/75), I describe the function of a hermes portal, which are magical devices that, when activated by some command, create a connection to a linked portal device. Portals allow objects to pass fro... |
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The title is horribly worded, but I have no idea how to otherwise title it.
Basically, the idea behind these special eyes is that they would be structured much like real-life compound eyes, but the first half of the ommatidia tunnel is mostly filled with a black mass that would absorb any light it touche... |
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Despite being a gas giant, and being chilly cold, there are a few reasons I believe Saturn would be an ideal habitat for future colonisation, and here are a few justifications:
* **Saturn actually has a closer gravity to Earth than even Venus**- Saturn's gravity is only 6% higher than Earth, compared to ... |
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I'm building a world for a novel and would like to have a single-sex, sapient species. The world is based on the general physics and scientific nature of our world but where more than one sapient species has evolved. What could be the major occurrences that would bring about an evolutionary change from a... |
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The end result is that a delivered envelope or the writing on it is designed to completely decay within 2 weeks to a month, ideally through natural processes caused by the type of materials used, so that the paper itself has decayed or the writing is completely illegible. It does not strictly have to be ... |
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Fly meat is likely a more efficient source of protein than traditional livestock, such as cows, sheep, pigs, chickens, and the like, in that:
* [Flies can feed on essentially any biomatter](https://www.jcehrlich.com/flies/what-do-flies-eat/#:%7E:text=Adult%20flies%20feed%20and%20harvest,nectar%20from%20f... |
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(this is probably going to be my last mermaid based question for while)
unlike their [giant](https://worldbuilding.stackexchange.com/questions/199692/how-could-medieval-ships-protect-themselves-from-giant-mermaids) counterparts, most [mermaids](https://worldbuilding.stackexchange.com/questions/167943/rea... |
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I'm running into some issues trying to make sense of both my planet's density (it's given properties should make the planet an ocean world, so I'm looking for lighter elements so the planet is rocky) and the origin of its exotic magnetic field (exotic as in concentric spheres that rotate along approximat... |
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I'm experimenting with a sci-fi setting where human-like mechanical androids are the dominant "lifeform." Though the setting is based on science, androids live in tribal societies. For the most part, these societies are devoid from other pierces of technology - there are no high-tech vehicles, weapons, o... |
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Context: this is for a Pathfinder 2e campaign, the setting is my own but the available spells are those present in the rulebook.\*
I would like a character in this setting to have an **artifact** which is extremely technologically advanced and which can do *something* that will make everyone (or almost e... |
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So, I have an Earthlike planet with a healthy biosphere, and I need to completely reset all complex life on it. Near as I can tell, one way to do this is by totally destroying the atmosphere (after all, not even the great dying could put an end to complex life on earth.) trouble is, I need the planet to ... |
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I've got two landmasses that are each situated on either side of a 20-50 mile wide sea (with the width varying along its length) where the sea runs for several hundred miles before opening out into the ocean proper. Is there any way that the tectonic plates of my planet could move away or toward each oth... |
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The Greek philosopher Empedocles famously postulated that the four elements comprising all matter are Fire (**F**), Water (**W**), Earth (**E**), and Air (**A**). More recently, the video game “Doodle God” has turned this theory into a fun way to waste time: by repeatedly combining these $4$ elements, th... |
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I have a planet too far away from its sun for photosynthesis to work well, so the plants use chemosynthesis. But since they don't use sunlight, would they have any reason to grow above ground? Some tall(tree sized) ones too? They need to be above ground so the herbivores have easy access to them.
And wh... |
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This is for a story I'm working on. These creatures are what the Native American myth of the Wendigo originated from. Their origins are a mystery, but they need to feed on human flesh at least once a month to survive. They are indistinguishable from humans except during feeding or hunting when they essen... |
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In my setting, a magic cast is able to alter the fate of a given person.
In this context, fate is not "set in stone" from the moment you are born, but rather given by the endless chain of causes and consequences given by your actions and everyone's else. So, someone "destiny" is like a tapestry given by... |
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I have a **post-apocalyptic** scenario, set in the ruins of an American metropolis with **flooded streets**. Boats are used most of the time, but aircrafts have advantages, for battle or if you have to get on top of some skyscraper ruin.
With the *apocalypse* some decades ago, I tend to **compare the pos... |
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This is my first post on Stack Exchange, so I'm not sure if this follows the right format. Let me know what I can change to make this more helpful on the site. Anyways, let's get to the backstory of the question:
I've been working on a near-future, technothriller novel for some time now: to remove a lot... |
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A hang-glider or a gyro-glider would suffice also, with the purpose of actually working.
I was hoping it wouldn't require a motor, because I doubt a motor could be built in medieval times.
If it could be built, how much manpower and resources would go into one single one? Would it be viable to mass pro... |
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I wanted to create a scene where two god-like characters are talking or fighting on a planet or fragment of planet to which they've teleported that's about to be obliterated by a black hole.
The characters are effectively gods so heat and gravity won't affect them too much. I wanted the black hole and st... |
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Today, dinosaurs, alligators, crocodiles, gharials and caimen are all that remains of a special group of reptiles called the archosaurs. Recently, it has been accepted by the public that birds did not evolve from dinosaurs but are themselves dinosaurs.
**But what if birds evolved from a *different* group... |
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In the "Warlords" Universe Ceres is the diplomatic and economic hub of the asteroid belt dominated by the rule of the 'Governor' and the 'Intercessor' (The Speaker for the Hegemon herself).
Now I'm stuck on is terraforming Ceres actually possible? I so far haven't addressed the issue only writing lore an... |
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Is it possible to have an atmosphere that is essentially fog, but still be breathable by humans?
I'm basically looking to have an environment where visibility is very low (for suspense reasons) even in full daylight (which would obviously not be that bright in this case).
If such an atmosphere is technic... |
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On earth, all sorts of machines require heavy oils and lubricants in order to function correctly, be it bearing grease, engine oil, transmission fluid or hydraulic oil, the majority of which are produced from heavy petroleum fractions.
Most plastics, such as polyethylene, ABS, or PVC, are synthesized fro... |
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Imagine a world somewhat like today’s. Two servers, halfway across the world from each other, decide to declare war on each other. How would one server attempt to kill the personnel in the other server?
Notes:
The stratagem should cause as little harm as possible to civilians, and definitely not to the a... |
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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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Closed 6 years ago.
[Improve this question](/pos... |
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Women are able to use magic by absorbing energy from a parallel dimension called the aether. They are able to access this dimension through a metaphysical organ in the body called the gate of life. By concentrating, this gate can "open" and absorb energy from the aether to produce spells in the real worl... |
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Given a semi-nomadic culture of arctic "hunter gatherers" with trade routes to the South, would it be impossible for them to develop metallurgy?
The setup I had in mind was that they trade ivory and/or furs for raw material and/or partially refined metal, take it home to their permanent winter camp and b... |
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Ten thousand random adults have been magically transported from Earth to an Earth-like planet with a surface gravity of 1.5g. The planet is otherwise completely habitable (enough sun, the right temperature, right mix of amino acids in the flora and fauna, plenty of fresh surface water etc.) There is no c... |
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On the world I am building (Let's call it Bob for simplicity's sake), the days last 9 years. As a result of this, the living beings on Bob must migrate across the planet to avoid the encroaching night. Now, obviously if Bob had continents like Earth, this would be impossible for animals (like the ones th... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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I'm writing an SF novel concerning a superman who learns about the value of Ni-Fe asteroids and gets greedy.
So he locates a huge, 20 $\times$ 14 km, asteroid and flies it to earth orbit. Then he decides to lower the $1.8 \times 10^{13}$ tonne, Manhattan-sized chunk of iron down on the ground. I'm consid... |
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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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Closed 7 years ago.
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Welcome to Smooth World.
Most of this planet (at least two thirds, but preferably more) has only tiny differences in elevation, 30-40cm at most. No hills, no mountains, no valleys. Even plains found on Earth usually have a fair amount of difference in elevation, but not Smooth World. From a far enough di... |
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At some point during the Cold War Earth experienced one or more failed alien invasions. Both the US and USSR had to face down this alien threat, and acted accordingly.
Established facts about the war:
* They managed to get around FTL limitations by employing surface-side wormholes
* The two world powers ... |
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With the help of inexpensive FTL transportation, humans have begun to spread across the stars. Many planets have been found with near-Earth atmospheres, while many others have been found that can easily be terraformed to support life. Due to the costs associated with development of a new colony, most new... |
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Given a species that did not rely on the scientific method for discovery, but rather a 100% correct intuition (essentially they correctly guess how the universe works, every time)... under what circumstances do they decide to inquire, or cease inquiry? If they had a limitless hunger for knowledge, obviou... |
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An alien arrives on Earth as a representative/ambassador of their government. Let's assume they arrive by some means of stealth ship and that they have no "special powers" (other than the fact that they don't need sleep, food etc) and look human.
Their government has given them instructions not to demons... |
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We are at war with the Clegg, a fearsome tribe of warriors. Both sides have typical medieval weaponry but explosives have not been invented yet. We are fighting over an area of fertile land that lies between our territories.
When passing through a small village we discovered the beginning of a small outb... |
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Related, and in continuation to [How would societies be if created and populated only by young people?](https://worldbuilding.stackexchange.com/q/7168/2812) In the previous question I asked about society as it would exist in western/first world countries after an apocalyptic event.
This question on the o... |
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The unit of measurement known as a Curie(after Pierre and Marie Curie) measures the rate of decay of Ra-226 in one second. It was originally measured at 3.7x10^10 decays per second. It has been more accurately measured to 3.6x10^10 decays per second.
I want to use the Curie and create a new unit of time ... |
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In a world where superpowers exist, two office workers are trapped on the Nth floor of a burning skyscraper.
Superstrong Sam is 100 times as strong as a regular mortal. That means his muscles can exert 100 times the force that would normally be expected, and his bones and connecting tissues can withstand... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Closed 12 months ago.
The community review... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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Closed 1 year ago.
The community reviewed ... |
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I'm looking for architectural inspiration for a city I'm designing, and I wonder what kind of building material would be used by the inhabitants.
They live at the foot of a mountain, relatively close to the sea, in a temperate forested region. A small river runs near the town, possibly giving access to s... |
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## Context
I am disigning a place called the Poisoned Sea, see this [question](https://worldbuilding.stackexchange.com/questions/223055/what-would-a-giant-corpse-island-actually-be-like) for description, there are clouds of purple plankton that eat the tough flesh of the dead God-Eaters and anything that... |
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Assume that paramilitary siege weapons were proliferated to the general public after America fell. Details below, but basically short of multi-billion dollar tactical weapons such as advanced fighter jets and nuclear submarines, anything that can be built by a resourceful family in a well-equipped garage... |
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So, I have a species of sapient aliens I'm designing, but I have one big problem: Cooking is widely (although not universally) considered to be a major factor in the evolution of sapience in humans, and this species has several features which would significantly slow the evolution of fire usage, and espe... |
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Giants in my world are fairly human-looking, besides being 14ft tall on average. Giants are unable to normally communicate (due to their constant heavy breathing) but instead communicate through stomping their feet. Giants can often predict earthquakes because of how sensitive their feet are to vibration... |
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I don't exactly want the science on how portals work (though I wouldn't complain if someone did), but I suppose they would work lore-wise. Portals can often be found behind long forgotten entrances, such as behind the doors of an ancient mausoleum.
The portals themselves are invisible and often unusabl... |
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One moment, there are as much as two trillion different universes, all of which have their own collections of galaxies. The next, 4,543,000 universes still have their galaxy collections. What happened to the others?
The unfortunate answer is this--a hyperadvanced civilization had parasitized on those uni... |
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# How to have humans evolve the same on multiple planets
In my fantasy universe, almost all sentient life, and most non-sentient life including humans, was teleported to hundreds of planets after a magiclysm (catastrophe caused by extreme amounts of magic stored in one place.) Although it's not the main ... |
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The world for my current work in progress is a fiction American small town with about 500 residents and 100 kids, located in geographically isolated location which makes busing to larger nearby towns impractical. So I need to set up the smallest possible education facility to cover daycare, kindergarten ... |
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There's an ongoing war with modern-day weapons (mainly guns). We're trying to develop a bio-weapon to just make soldiers unable to fight with guns while minimizing suffering, such that they're able to go back to their normal daily lives after the war.
My first idea is to make it so that the soldiers woul... |
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A multimillionaire is going to hunt for Bigfoot in North America (let's just assume confined to USA). Capture preferred, kill acceptable. What would be the most sensible way to do it (highest success chance, yet still rationally economical)?
(Question partially inspired by the story of [Robert Bigelow an... |
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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.
Afte... |
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