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I want to explore an advanced Native American civilisation; assume their general 'technology level' is 'equivalent' to 13th-century Europe. Biggest difference is that their metallurgy is lagging behind; this country is only just starting to make use of iron for instruments larger than tuning forks, and t... |
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I had Originally thought of using Nicoll-Dyson beams to propel probes and small ships from the Milky Way to as many galaxies as they can reach to turn stars in those galaxies into [Shkadov thrusters](https://en.wikipedia.org/wiki/Stellar_engine) to return to our galaxy.
The problem with Shkadov thrusters... |
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[](https://i.stack.imgur.com/lYFdp.png)
Amino acids, the building blocks of proteins and, therefore, one of the key components of life as we know it.
There are many amino acids in nature, but they all stem from the same basic structure. ... |
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How and out of what could flexible, thin air-tight tubes be made of at around 1780? These tubes need to be around a centimeter wide, with a 7.5 mm tube going through it. It must also be heat resistant (steam temperature) and be air-tight.
also, it would be helpful if someone could give me some lightweig... |
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I've spent a good deal of time working through the mechanics of 'realistic' space combat, and figure that good old kinetic projectiles will probably still at least be part of the arsenal, if not the primary weapon. The effectiveness of such weapons, however, is mostly dependent on the muzzle velocity. Le... |
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Basically, the problem is I want to leave behind isolated pockets of survivors. Also, I want these survivors to be a primitive culture - current real world level - compared to the original civilization (which was Kardashev type III. The survivors (several generations into the future) must not know that t... |
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To put this title into context, there are actually two basic kinds of angiosperms on Earth, showing here:
[](https://i.stack.imgur.com/C7e2Q.png)
These differences in characteristics serve their own adaptations to survive and thrive.
Now... |
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So you can accelerate or reverse time of an inanimate/non sentient object within a limited space.
Despite having such powers, you don't want to rule the world. Instead you want to make alcoholic drinks.
Assuming you have only basic knowledge of making liquor of all kinds, how will your time related magic... |
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NB: *for more background, the humans of this question are the direct ancestors of the druids from [that question](https://worldbuilding.stackexchange.com/q/129626/52315).*
I am building the timeline of a druidic society which rose to dominate the forest they lived in, thank to their discovery of magic.
... |
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In my book series, a group of a few hundred explorers are sent from a planet called Ishgabangaloodoo to explore Sea World.
Some things to know about Ishgabangaloodoo:
* Its citizens are referred to as Ishgas
* It culturally resembles Victorian Britain but has technology on the level of Star Wars
* It is ... |
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Imagine a human observation and research facility being built on a planet in a distant solar system.
How could an alien colony exist beneath the planet's surface, staying completely invisible to humans on the ground? Let's say that aliens have a portal technology allowing them to travel from within the p... |
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I'm writing something in which the main character has become a vampire, or vampire-like entity, due to the influence of a Lovecraftian horror.
What are some things they, as a conscious person, may or may not experience due to a lack of a heartbeat that aren't immediately obvious and that aren't generally... |
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As part of a series of questions about a hard sci-fi universe (for more answered questions about it, please check [this](https://worldbuilding.stackexchange.com/questions/112853/railgun-launched-nuclear-warhead "Pew packing a boom") and [this](https://worldbuilding.stackexchange.com/questions/112971/mult... |
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In an alien society, humans, humanoids, bipeds, and quadrupeds mingle on a daily basis. Assuming all the humans and humanoids wear clothes as we are accustomed to them, what would be the quadruped response?
Obviously, one of the primary reasons for clothing is to conceal particular features of anatomy, b... |
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**Setup:**
We are in a alternate timeline where there is a [Counter-Earth](https://en.wikipedia.org/wiki/Counter-Earth) that always stays perfectly on the exact opposite side of the Sun from our Earth. It has about the same size and mass as our planet, but is lifeless. It doesn't have a moon.
Everything ... |
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Imagine Naga grenadiers. [Snake people](https://vignette.wikia.nocookie.net/mahabharata/images/1/14/Naga-astra-indian-mythology.jpg/revision/latest?cb=20150912185946), human from head to hips, with a snake's body instead of legs.
How would they throw grenades? Much as humans do. Except, as they're throwi... |
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What is the maximum size a ship can become without negating the effects of waves to the point where seasickness is no longer a problem? The larger a ship becomes, the smaller the rocking effect waves have on it becomes. As a result, large ships tend to have a lesser effect on people inclined to seasickne... |
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See, I'm a low-g cargo shipper by trade. We get all sorts of containers in all kinds of shapes that we need to fasten to the deck plating, and to do that we use magnetic clamps.
Now, these clamps are all manner of strong. Like, stupid strong. My engineer tried to explain it to me, something about super m... |
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I'm writing my first sci-fi novella and I'm looking for a bit of guidance from some scientifically literate people. My main premise is that an alien space ship similar to the death star enters Earth's orbit at a low orbit point. Its gravity causes earthquakes, tsunamis, meteor showers and all that fun st... |
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**This question already has answers here**:
[What would be the tallest possible height for humanlike creatures in earthlike conditions?](/questions/51686/what-would-be-the-tallest-possible-height-for-humanlike-creatures-in-earthlike-c)
(5 answers)
Closed 7 years ago.
What genetic traits would be n... |
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For a highly intelligent avian dinosaur whose grasping and manipulating appendages have all but vanished, there are options : for the species to evolve beaks that are better fine manipulators, or continue to writhe in abject mediocrity. So the question is - which type of beak might the birds evolve to se... |
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I'm creating a world my protagonist will visit with humanoid inhabitants that have a peculiar feature: their eye sockets are in the palms of their hands, not unlike the Pale Man Pan's Labyrinth.
[](https://i.stack.imgur.com/oiYM2.jpg)
T... |
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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.
It s... |
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Suppose that Khufu, pharaoh of Egypt and builder of the Great Pyramid of Giza, was introduced to the idea of an amusement park.
More specifically, suppose that he was visited by a time traveler and was invited to go on vacation with said traveler to the 21st century. On this vacation to a modern amuseme... |
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Specifically, the gas giant [Epsilon Eridani b](https://en.wikipedia.org/wiki/Epsilon_Eridani_b), and a moon that has a mass of ≥0.25 Me. If there's no feasible way the moon could have oceans at a distance of 3.52 AU from a star that emits 0.34 times the amount of light that the sun does.
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The... |
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There were many questions in this site about slaying dragons, butchering dragons, but never one about restraining them. Poor Gyvaris managed to avoid all those fates but the last.
Gyvaris is a dragon, currently in the "service" of not St. Martha and not St. George. Having been nearly killed and unintenti... |
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I'm designing a small two-person spaceship for use in battles in space. It is set around the year 2100.
It would be around the size of a tank (approx. 50 tons).
It would need to be fast and easy to control, as it would go up against laser weapons and heat-seeking missiles (Star Wars style).
As it would s... |
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Setting is [20 minutes into future](https://tvtropes.org/pmwiki/pmwiki.php/Main/TwentyMinutesIntoTheFuture) - everything is as we know it, or as we can reasonably predict, except the zero-tau capsules.
Capsule is a thin mesh of Unobtanium connected to a portable Handwavium reactor. When turned on, time i... |
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The world is flooded and some people have survived and managed to build small towns and even massive cities on the ocean that now covers the world. Is this possible hypothetically? How much of the world's population would be left after such an event?
Notes:
* the whole world (with the exception of a few ... |
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***RIDGEFIELD PARK, NJ** – April 2, 2019 – Samsung Electronics America, Inc. announced that the new, award-winning Galaxy S11 and Galaxy S11+, which have been recognized by smartphone reviewers worldwide for their best-in-class display, design and camera, are now available for purchase at U.S. wireless n... |
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I've read several of the questions about language shifting and diffusion here, and it has unfortunately left me more unsure of things than I was before.
Situation:
Colonists on an arid planet speak two major languages, Hindi and American English, there are also spacers who speak English as well.
There... |
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On saturn's north pole there is a hexagonal cloud which does not move.
My question is: is it possible to theoretically make a hexagonal cloud on an earth-like planet? And furthermore, is it possible to "freeze" clouds in mid-air so that light doesn't pass through in certain places?
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**Yes.**... |
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I'm in the early stages of designing a city, and would like some advice about to structure its roads realistically for transport.
The city is circular, *with large roads entering the city at north/south/east/west*. It should also be *on higher ground* - doesn't have to crown a mountain, but should be hi... |
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I was told to post this question separately, so here it is. I need help with the geography and climate of my map.
[](https://i.stack.imgur.com/NlAXK.jpg)
* Blue circles are ports
* Gray circles are cities
* That one brown circle is a town
* The ... |
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**This question already has answers here**:
[Are geographically typed planets realistic?](/questions/40/are-geographically-typed-planets-realistic)
(6 answers)
Closed 6 years ago.
Think of some famous outside-of-the-solar-system planets from say, Star Wars. Tatooine. Hoth.
They all have something... |
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I want to explain large Viking kingdom that keeps the worship of the Norse Gods (Odin, Thor, Loki) not the Christian nonsense of the Normans.
So I was thinking of bringing a Viking fleet to South Africa where they would be far away from disgusting missionaries and fight cool enemies such as Zulu or whate... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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**Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/34564/edit).
Closed 4 years ago.
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I'm trying to setup a non-real scenario that doesn't break suspension of disbelief too much past the original idea. But so long as things keep consistency it should be fine.
So you are flying a fighter plane of sorts (could be current tech, you could opt to choose future tech or old tech for your answer ... |
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I hope my question isn't too vague or broad. It's a follow-up to [this one](https://worldbuilding.stackexchange.com/questions/3054/can-a-genetically-modified-human-breathe-something-other-than-earths-oxygen-nit).
So, we have a human (genetically modified in order to support life on another place, from pr... |
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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.
Supp... |
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It is not uncommon for some fantasy and RPG's with a modern setting to boost their melee weapons with electricity. However some people think that such modifications won't really improve the killing potential of the melee weapon.
My question: how would you design an electric melee weapon designed to enhan... |
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Related to [this](https://worldbuilding.stackexchange.com/questions/220815/how-to-encourage-education-and-an-atmosphere-of-respecting-knowledge-and-critic/220840#220840) question: After the main character united the seven clan into a Soviet-esque nation, education is introduced and critical, rational, an... |
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In the setting I'm making, Orion drives are one of the primary forms of propulsion used in spacecraft. I have been thinking of adding Nuclear Salt Water Rockets (the lithium variety) alongside Orion in order to have a 'classical' rocket punk feel to the setting alongside the raw power of Orion, though wh... |
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In my story, my MC ends up hosting a known (and common) alien life form within their head to keep it alive by joining with another sentient being; as a result, both host and alien life form's personality is infused while it's still inside her. This was done on dubious consent due to the death of the orig... |
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Are there any medicine out there specifically used to treat serious illnesses (it could be something as simple as painkillers to something for a very rare chronic illness) that could be swapped out for a placebo or a fake alternative at a pharmacy by some kind of gang or cartel for profit on at least a t... |
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In my setting there is a race descended from [Gigantopithecus blacki.](https://en.m.wikipedia.org/wiki/Gigantopithecus)
These creatures retain much of their ancestors physical features, such as:
•An impressive height of 2.75 meters (9 feet in freedom units)
•Disproportionately long arms and plenty of str... |
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I recently came into possession of a rather large mass of molasses due to a misunderstood Alexa inquiry and since the restocking fee is outrageous, I plan on using it to answer a nagging question I've had: is it possible to surf atop a body of molasses?
I've got approximately 1.898 × 10^27 kg of the stuf... |
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I’m designing a utopia but there’s one problem remaining.
The setting is one of a highly advanced human society. We’ve eliminated disease and allowed the natural environment to replenish. Individuals live for about 100 years on average with good physical ability for almost their whole life. Space travel... |
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In a lab at Caltech [Ken Libbrecht](https://www.its.caltech.edu/~atomic/) has been simulating snowflake formation and under absurdly exact laboratory conditions, they have been able to create almost identical snowflakes.
Clearly, in the real world, we do not observe identical snowflakes because each sno... |
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The mer-folk are typical top-half human, bottom-half fish. They can breath with either lungs or gills. Their homes are *mostly* below water, but some do also extend above. This allows them to do activites only possible above water (such as cook) and some things just because it feels good to "get some fre... |
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My question here is if there is any circumstance, however unlikely, that could lead to explosive nuclear fission that was not set off by intelligent creatures. I'm working on some bizarre planets for my heroes to find, and I was thinking of one where nuclear explosions are an environmental hazard. Is tha... |
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The Humerns are quite an odd species when it comes to mating. They have nine distinct sexes (not genders, they’re biologically distinct) all of which exhibit varying levels of dimorphism and all of which can interbreed with any sex but their own. Don’t even ask about their social structure or mating ritu... |
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In my story all humans except one vanished suddenly. This one received the gift of immortality and is now alone in this world.
Considering that the world is identical to ours. **How much time does this human have to continue using the internet and electronic devices before they stop working?**
If intern... |
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The normal condition of life in a planet (Earth right now) is that below us is the planet's core, and above us is the sky.
[](https://i.stack.imgur.com/dHftl.png)
Now if there's a hollow planet like above, is that possible? How does gra... |
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I can think of at least 2 movies that had aliens invading Earth for water.
Is this a feasible motivation? I was thinking that
1. Water is H20, i.e. dihydrogen monoxide
2. The vast majority of the universe is made of hydrogen
3. Oxygen is also pretty common as it's the 3rd most common element in the unve... |
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The primary reason that Hawaii was annexed as a territory of America is that they believed (and rightfully so) that if they didn't annex it, some other nation would, but which nation? There are a variety of possibilities, from the ever expanding English Crown, to the Japanese empire. If for some reason, ... |
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Would a large, I mean large, impact crater on a spherical world be noticeably distorted on maps using different projections? Eg mercator, hanmer-aitoff, equidistant Etc.
Side question - Would there be a difference if it was a head-on circular crater or a side-on deeper on one end crater?
I assume if the... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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This question does not appear to be about **worldbuilding**, within the scope defined in the [help center](https://worldbuilding.stackexchange.com/help).
Closed 7 years ago.
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So there's a planet that is used as a farming world (food) for its system. This planet has a single, Mediterranean sea-sized ocean on it and lacks any other major surface oceans (he hasn't excluded rivers and lakes). Is there any way, given these parameters, for a water cycle that is vigorous enough to s... |
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The planet in question is Earth-like in size and composition and orbits a Sun-like star. Its atmosphere is less than 5% Oxygen and plants (lichens, some grass and river vegetation) have started colonizing parts of its surface.
## How would bodies decompose in this environment?
The bodies are either huma... |
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I've designed a creature for my alien world that is a large apex predator known commonly as a wraith. It lives mostly in dense jungle and forest and uses stealth and ambush to catch its prey (it can take down creatures the size of a horse). Its senses include the contextually unimportant taste and touch,... |
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There are three cyberpunk corporations. All of them engage in immoral criminal activities to raise funds, and they don't really have a choice...profit margins are tight, and we have to stay afloat in a declining economy. I run one of these cyberpunk corporations, and I'm fighting a long and bloody war ag... |
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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.
**Fo... |
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After the adoption of Christianity as the one official religion in late Ancient Rome, the new role of pope inherited some duties of previous leaders, among them he’s responsible for the calendar. The last time this authority was notably enacted was with the [reforms of Gregor XIII](https://en.wikipedia.o... |
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In [this question](https://worldbuilding.stackexchange.com/q/25318/28) I asked about the lighting patterns from this system:
[](https://i.stack.imgur.com/UyIOs.png)
A really helpful answer there explained when the planet is getting how much illumination.
Thi... |
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I have a world where there are five guilds, each creating a semi-autonomous political entity over a region of the world. At one point, a single empire controlled the whole continent, but the empire's power has since waned and is now only a figurehead.
The guilds are based around common traits, so they di... |
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We can rebuild him. We have the budget... but do we have the technology?
In the process of reviewing the proposed enhancements for the Six Billion Dollar Man the following was discovered:
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> **Enhancement**: Extended Voluntary Apnea
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> **Purpose**: Implanted device significantly extends the period... |
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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.
Supp... |
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For the sake of simplicity, we will use 1200's Medieval Paris as an example. The city has walls 40 feet high and the initial defending army (army A) is 1500 strong. The attacking army has to breach the city and storm it. The citizen militia in the city equate to another 800 ill-equipped defenders.
It **H... |
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Within my setting, there are [magical items](https://worldbuilding.stackexchange.com/questions/11781/how-would-i-limit-the-amount-of-magical-bling-a-person-could-wear). These magical items are created by affixing runes onto them. These rune are drawn with metal thread from various precious metals: copper... |
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[Based on my previous question here,](https://worldbuilding.stackexchange.com/questions/10757/the-desert-of-ore-how-is-it-different-from-a-desert-of-sand) which a helpful other person pointed out, which would make the question too broad, here comes a different question for that.
Given a desert full of or... |
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In a hypothetical near-future setting, humanity has been subjugated by an upper class of cyborgs. A melding of man and machine, they rule the world with an iron fist. The resistance has one chance to assassinate the supreme leader of the cyborgs, but the only weapon that will fit into the plan is a Mk 14... |
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So, I've read a few posts on this community about medieval airships. What I have seen is so far that, how none of them mentioned about a lifting gas. Lifting gases are hard to get by.
Hydrogen and helium are extremely hard to produce/obtain and require technology that is way past medieval levels, and fur... |
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This is a submission for the [Anatomically Correct Series](https://worldbuilding.meta.stackexchange.com/questions/2797/anatomically-correct-series/2798#2798).
[](https://i.stack.imgur.com/3tOT3.jpg)
Sea serpents appear in various mythologies. M... |
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Scribes and other literate administrators were a hot commodity in the ancient world. Whether they were Confucian Scholar-Gentry or Catholic Monks, the pre printing press world made whole social classes defined by literacy. Likewise, harems and other large retinues of wives and concubines were a common oc... |
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I am irritatingly perfectionist and must know things to relax my anxiety.
So this creature here. From the top its head shape is salamander. Its mouth is large and strong and the cranium needs enough space for sentient brain and good fitting hats. It can switch to quadruped movement.
It is approximately 4... |
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In one of my stories, there are people with powers. Inherited from parent to child or through accident and experimentation. There's the main government like ours, and a para-military agency organisation that is involved with dealing with unusual events, objects and people, such as gifted people.
( A bit ... |
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So, my werewolves are a diet version of the classical lycanthrope.
* They have considerable strength and a thick hide, but a trained human can still overpower them.
* They can be hurt with regular weapons and poisoned with silver items
(more precisely, the pathogens that reside on silver surfaces).
* Th... |
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I'm working on a species of fantasy creature based off the mythological Behemoth. It's only constraint is the laws of physics itself. Environment and evolutionary lineage won't be relevant due to the species' place in the story. It's a vertebrate land animal, and I want it to be larger than any land crea... |
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Now [octopuses](https://en.wikipedia.org/wiki/Octopus) are quite smart already capable of camouflage and puzzle solving.
[](https://i.stack.imgur.com/ieWCw.png)
given this I was wondering whether Octopuses could [Convergently evolve](https://en.w... |
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While reading [this question](https://worldbuilding.stackexchange.com/questions/168345/feasibility-of-humanoids-that-evolved-from-non-primate-mammals) about how non-primate mammals could develop a bipedal stance, I became curious about the broader reasons why animals could evolve to walk on two legs.
I f... |
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I want to try writing some stories based on "hard science" but set historically and based on the scientific knowledge of the time. I'm thinking probably 1800s or early 1900s, but willing to go back further if it makes things interesting.
My question is where can I go to get information on what we used to... |
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**Would a computer using biological components as an interface be any good? Would that protect it against hacking? Or provide more complex processing?**
The way I'm going with this is that computers are at risk of getting hacked when they connect to the network. However as I understand biological comput... |
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It is a known fact that magnesium is a very important part of photosynthesis and chlorophyll. I have looked everywhere to try to find out this question but I have never really gotten a solid answer.
What is magnesium's role in the chlorophyll molecule and what if it was replaced with another alkaline ear... |
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I'm just trying to write a RPG adventure for a sci fi company. So when I have to figure out what kind of orbits, masses, major axis, etc are needed for the system I need to design and I see:
$T=2\pi$ times the square root of etc., etc.
Yeah, that's not going to work. I need a tool so that I can design a ... |
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Phytoplankton are not to be taken for granted. Not only do they form the core of marine food webs around the world, they also release half of the world's oxygen. But phytoplankton, being plant-like organisms, need nutrients for their blooms to survive and thrive into populations large enough to be visibl... |
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Consider a fantasy species of "natural" time travelers. To define some specifics:
**Relevant Rules**
* While it is not effortless, this species can move against the "arrow of time" much as a human can swim upstream a *gently* flowing river (and they don't need a machine to do so). The swimming metaphor c... |
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How can a species force an external body to heal itself and speed up the process without the use of magic and technology but by biological means?
Sanators are creatures who can force the body of a nearly dead person or animal to heal or stop bleeding, even on the edge of death or when they are unconscio... |
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I've already considered that they may file their horns down, but keeping in mind that their horns gradually regrow, it is an inconvenient solution.
This is what their horns typically look like:
[![https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/intermediary/f/65daedac-37bf-42e7-bcc2-61402950e11... |
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> *TL;DR - I want my angelic race to have the ability to speak in a way in which up to three sentences are communicated at the same time. (Assume English for the sake of simplicity. I want physiology answers, not conlang answers, as evidenced by the question on whole and my tags.)*
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In my stor... |
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In this world, witchcraft is practiced openly and is respected. It exists in three forms: ritual and arcane. Ritual magic involves using the mana of the world and directing it in a way to suit you (altering terrain, changing the weather, erecting barriers, etc). It requires chanting, numerous ingredients... |
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I have a world with 4 colossal cities. Like, more area than the earth big. They are inhabited by a population orders of magnitude greater than ours, consisting of many different species.
Due to the immense size of each city, each has multiple systems of government, the laws of which apply to individuals... |
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A lot of worldbuilders that I know and have spoken too, insist that unbacked currencies and items with constantly changing values would be what the economy is based on. I, however, am skeptical of this.
Now, I am aware from reading lots of Atomic Rockets and my education, that in space pretty much any ma... |
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Say a computer running an AI exists on a planet with no biological life. Say it has access to a rather extensive preexisting manufacturing plant and can control a fleet of machines capable of performing the whole process of mining and transporting raw material to build and assemble more machines, fabrica... |
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Tree growth rings are created because the time of day with sunlight differs throughout the year. How would the inside of a tree look, if it were to grow up on a planet without seasons, where day and night are always 1:1? I tried to look for studies on growing trees under artificial light, but couldn't fi... |
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My magic system involves all organisms producing a sort of energy field that acts as their immune system. If someone casts "too big" a spell - draining too much of their energy and compromising their immunity - they obviously are vulnerable to all kinds of illness and disease.
My question is: what are so... |
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For one of my fantasy humanoid races, I am conflicted on whether to make them digitigrade or not. A big question that comes to mind for this, is how shoes might work for a people with feet similar to say, a wolf or lion (no, these guys do not have hooves).
Perhaps something like a roman sandal might wor... |
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In my world there are humans who have undergone a mutation from being exposed to a certain kind of magic. They have not realized they have been mutated until they start noticing that they have the ability to see well in the dark (low light, not total darkness). Outwardly, they look the same as they did b... |
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Similar to other suggested dynamic structures using kinetic energy to provide structural support, I am considering options for resisting external pressure in a vessel (e.g. a diving bell) by incorporating magnetically supported rotating hoops into the hull. The principle would be similar to an [orbital r... |
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Imagine a desertic planet, large dune seas and barren rocky wastes ... Mountains and the like suggesting a past geological activity and even water once exhisted on the surface.
Now though the planet is fully desertic, it has a human breatheable or partially breatheable atmosphere (for brief periods befo... |
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