Questions tagged [reality-check]

Asks if a given concept is realistic in a given context. Answers should say yes or no, with supporting info. Compare this with the science-based and hard-science tags. This tag should never be the only tag on a question, because this tag frames how a question should be answered, not the topic.

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3answers
96 views

Exclusively underground creature experiencing sun-light for the first-time

I have this creatures which were hiding underground for millennia. They are, from the beginning of their history, exclusively nocturnal. They emerged back on surface after moon disappeared (...
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6answers
271 views

How large could a population of supernatural beings be and still be plausibly hidden?

I am trying to figure out how large the population of supernatural beings can be in a stereotypical urban fantasy setting before their numbers stretch the suspension of disbelief. I.e., your standard ...
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17answers
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How to find out if someone is guilty of adultery?

Cheaters are considered to be inferior humans with defective genes and just like mentally ill people and individuals born with various handicaps are eliminated from the gene pool. Capital punishment ...
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3answers
218 views

Can a galaxy be formed from a black hole?

I'm writing creative text and I'm curious to know, just as possibility, can a galaxy by any chance be formed out of a black hole?
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5answers
1k views

How easily can a medieval granary explode?

The villainous gremlins are attempting to cause as much damage to the lands of the Empire as possible with as little effort as practical. They have numerous plans to this end. One such plan is to blow ...
3
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3answers
228 views

If the Earth would break apart, how likely would the large debris stay in orbit?

In the story I'm writing, Earth gets destroyed and the few million humans that survive go to live on another Earth-like planet. Since the destruction of the planet, the humans do visit their star ...
9
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7answers
527 views

How accountable would a person be for a crime committed when under alien influence?

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 ...
3
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4answers
156 views

What would be needed to have a database that contained information on people with powers in a post-apocalypse?

For a post-apocalyptic world I'm writing, I have a bunch of, essentially, demons that have killed a large majority of humanity, destroying almost everything in that stands in their way, whether that ...
22
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10answers
4k views

What laws, if any, would have to change to allow people with superpowers to use their powers for profit in companies/businesses?

In a world that's essentially a carbon copy of our own, through mean's no one knows how, people started developing superpowers. With seemingly no rhyme or reason, people got powers of all shapes and ...
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2answers
92 views

Alternative evolution mechanisms using cell fusion

I am trying to understand if it would be possible for organisms to evolve by different means other than random mutations and natural selection. Eukaryotes were predicted to be formed by fusion with ...
3
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3answers
210 views

Required secondary powers for someone who can manipulate/turn into smoke?

In a world that is all but a carbon-copy of our own, through means no one quite knows how, people started developing superpowers. Studies have been done to try and figure out why these people gained ...
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7answers
856 views

anatomy or musculature to achieve full rotate jaw?

you know a jaw or mouth where the jaw full of teeth fully rotate like a drill or gear to shred their food or prey, usually show often in worm type of monster (my question is not necessary to be worm ...
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5answers
214 views

biologically or anatomically is there a problem with this type of double mouth or jaws?

i am not talking about xenomorph or moray eel type of jaws or multiple mouth or lower jaw inside the mouth. but this type of mouth/jaws or i called it double chin jaws where the chin also work as ...
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4answers
1k views

How to teach the Mesoamericans seafaring?

I want to have a powerful Mesoamerican civilisation by the 1100s; one that decides to sail east and discover Europe. Earlier versions of the story had them contacted by Zheng He in the 1400s, but I ...
5
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2answers
211 views

Could we build a roof over the Grand Canyon?

(or some other Lesser Canyon) I'm playing with story ideas for a videogame that takes place in the post-post-apocalyptic US. Everything is overrun with monsters and ocean horrors and whatnot, you've ...
4
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6answers
168 views

Could there be a situation where a plane would be certain to be destroyed by dropping an atomic bomb?

Well obviously, if a plane is flying 100 feet or meters off the ground and and flying at only 50 miles per hour, the bomb would hit the ground and explode before the plane could get far enough away to ...
4
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7answers
260 views

Realistic Applications of a Person with Wind/Air Powers?

Someone has the power to manipulate wind/air. With conscious thought, they can channel large gusts of wind to send doors flying off their hinges, use the wind to help them jump ridiculously high ...
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2answers
182 views

Are these traits for my planet mathematically accurate? Could it support life?

Mass of star: 0.75 M☉ Radius of star: 0.69 R☉ Surface temperature of star: 4,620° K Luminosity of star: 0.2 L☉ Satellites: 2 Place in solar system: 2nd Mean radius: 8,725.1 km Mass: 2.57 M⊕ Mean ...
4
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2answers
95 views

Proportions of a giant humanoid?

In a humanoid mammal, say 15-20 feet tall, how would the brain, heart, reproductive organs, facial feature and other attributes scale up? In very large mammals, the brain seems to be comparatively ...
7
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8answers
459 views

What would encourage multiple animal species to evolve human features simultaneously?

The setting is fifty-five million years in the future on Earth, with multiple humanoid species that have different ancestors, but share similar characteristics. Their ancestors would be animals that ...
3
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3answers
221 views

Realistic Take on a Person with Water Manipulating Powers? [closed]

Someone has the power to manipulate and shape water from almost any source, such as condensing water in the air, with the only exception being other "living things"(for the purposes of this question, "...
3
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1answer
80 views

Could time travelers go back in time and help teach homonids how to build a civilization?

I'm writing a short story where a group of explorers found a mysterious cave in a remote jungle , Inside the cave they find strange paintings of spirals resembling portals , after exiting the ...
3
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2answers
118 views

Would a collective mass of nanobots function properly as a single robot?

In my story, I want to explore a concept similar to Terminator 2: Judgment Day and Terminator genisys, with a robot that is in fact composed of millions of nanobots, which thus grants it the ability ...
4
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2answers
100 views

What would be the effects of a post-apocalyptic planet being almost completely consumed by darkness? [closed]

One day, through means no one quite knows how, the world was consumed by near-total darkness. The sky became near pitch-black, the "days" only allowed little light through the clouds of darkness, and ...
2
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1answer
182 views

Does this magic system seem sufficiently hard-rational?

The world I'm making is primarily sci-fi with a few elements of hard fantasy (the fantasy is mostly aesthetic). The magic system I've come up with so far consists of these premises: 1) Everything in ...
4
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1answer
112 views

How large could an aquatic humanoid get?

Vertebrates on land are limited in size by various factors. However, in the water, they can get much larger. How large could an aquatic humanoid creature (like cthulhu) realistically get, and what ...
9
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3answers
2k views

Feasibility of six inch space-faring aliens

I’ve recently been playing a alien game with various alien species. After playing for a bit, I wondered whether or not a 6-inch tall intelligent race could exist. I can already see some major ...
4
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3answers
1k views

Would a human brain with 50% fewer neurons but 50% more dendrites be as intelligent in modern society?

Suppose advancement in medicine and using cutting edge technology we could remove (halve) the amount of neurons in a healthy brain and allow the left over neurons to somehow grows extra dendrites that ...
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2answers
137 views

Could a Person with “Bug” Controlling Powers Realistically Make Spider-Silk Armor?

Say there's a person who can control every kind of "bug," (For the purposes of this post, the definition of "bug" includes any arachnids, myriapods, insects, and worms that exists in the world) with ...
19
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10answers
5k views

Realistic Take on a Person With Invisibility Powers?

Someone has the power to turn themselves invisible, as well as other objects in a short radius, by bending the light around them and the invisibility can last as the person wants through conscious ...
4
votes
5answers
650 views

What would be needed for radio broadcasts to be a viable means of communication in a post-apocalypse?

The post-apocalypse in question is one where monster-like creatures have taken over most of the world. Now, twenty to thirty years later, only a few clusters of humanity still remain with somewhat ...
3
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3answers
235 views

Required Secondary Powers/Realistic Implications for a Person That Can Control Darkness

Say someone has the power to generate darkness. It appears as a sort of "smog" that can cover anything, and anyone inside the "smog" can't see anything as every bit of light has been removed, except ...
13
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6answers
4k views

Could a group of survivors realistically find useable ammunition and/or weapons in a post-apocalyptic world?

I'm trying to figure out if it would be possible for a group of people living in the wilds of a post-apocalypse USA could find some useable weapons and/or ammunition. The post-apocalypse in question ...
9
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5answers
307 views

Is three-dimensional time consistent and paradox-free for time/dimension travelers?

This question was edited based on answers already submitted. I am designing a universe with both time travel and alternate realities, but I don't want the whole thing resting on hand-waving and ...
3
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3answers
267 views

Can one (re)learn empathy if they have the necessary structures?

In my world, I plan for an alien pathogen to cause drastic mutations in all lifeforms, reshaping plants, animals and humans alike in a scenario of near inversion of positions, with animals and certain ...
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1answer
169 views

Erasing love from the world

TL:DR love sucks and causes humans to blindly look for a perfect match which eventually fails because no one is perfect for one another, relationship are built not gifted from God Evolutionary ...
15
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21answers
5k views

What is the best way to defeat a enemy of superior numbers but inferior technology?

Our protagonist civilization is based on a large island in the middle of the pacific(think half the size of Australia), has a population of 100 million, has abundant resources and is totally self-...
4
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3answers
141 views

Rifle and Bullet Technology

I’m currently working on something where breechloading rifles and cartridge shot are developed very quickly over matchlocks and flintlocks. What major technological hurdles need to be overcome for ...
3
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2answers
286 views

Best Animal for traveling through post-apocalyptic Colorado Mountains?

You are a part of a tribe called the Twin Sisters. You need to travel for about 3 weeks worth of travel, but there all no cars: You live in post-Nuclear Colorado. You need some type of animal to ...
18
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16answers
6k views

How do I ensure that two characters survive the black death without making them naturally immune?

Everyone in my community is collapsing to the ground and dying painfully. My husband, he is one of the few remaining men to bury the dead and I worry that soon I'll be left alone. How do I ensure that ...
4
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3answers
235 views

What would it take to make watching movies in the apocalypse an actual possibility?

For a story I'm writing set in the post-apocalypse, I have a character whose only real reminder of their dead family are the movies they used to watch together, since everything else that belonged to ...
2
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4answers
243 views

Disney buys all the rights on sex bots [closed]

Year 2030, and sex bots have now been around since the early 2018 and existed as a concept for more than half a century. But during the last years they became more and more common, they are not in ...
8
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2answers
144 views

Reality check: Could a diamagnetic gold shell around a planet exist?

Could a gold shell around a planet exist, suspended by a magnetic field (gold is diamagnetic), given the following constraints? A gold layer enveloping a planet, arbitrarily thin. Unspecified height, ...
14
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5answers
3k views

In the city of Altheia everyone dresses in copper: is this possible?

Altheia is the City of the Copper Folk. Its bishops and wise dictators believe that copper is the metal of gods, a holy item given to Altheians as a gift for their religious behavior. Edit to ...
6
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2answers
268 views

How quickly could a “shapeshifter” lose mass, realistically?

Shapeshifters and mass... ever the bane of realistic science fiction. Basics: Let's say someone is changing shape (for whatever reason, voluntary or involuntary, it doesn't matter for this purpose). ...
3
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3answers
723 views

Would scanning solar systems/planets for carbon concentrations be a viable way to search for alien life?

Working on a story about a crew of astronauts on a mission searching for evidence of alien life, either still living or long extinct. Not a biologist or chemist, but from my elementary understanding I ...
3
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2answers
120 views

Is it possible to retrofit white blood cells with neural network technology to fight infection?

I have been toying the idea of fusing our white blood cells which search and destroy malicious foreign bodies with artificial intelligence to fight various disease causing pathogens, my worry is that ...
6
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4answers
1k views

(GRUESOME CONTENT) skinning people and actually keeping them alive [closed]

In my story queen Caitlin is inspired by many "cruel" real queens of Chinese, African and European history. She has a strong sadistic pleasure in seeing other humans suffer. But most importantly a ...
4
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2answers
203 views

Could a metal be indefinitely stained by human blood?

Say there's an in-universe weapon so odd looking that it is rumored to have been stained by the blood of a "holy" mortal, so much so that no amount of water can wash it away. Is there a chance human ...
1
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0answers
102 views

Humans In A Fantasy World [closed]

I am currently building a fantasy world that contains humans inside of it, but the problem I currently face or wonder about is what physical differences there might be in my world compared to the ones ...

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