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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Is it possible to create a weapon that produce a flying slash? [duplicate]

In some fictional Samurai movies/book, there are some techniques that able to create a wound using a sword without making the sword touch the victim's body. Some references use the term "Flying Slash" ...
2
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2answers
80 views

Would this setup of a terraformed moon hold up?

[Edits added in italic] BACKGROUND A few thousand years from now the moon has become one of many habitable places in the solar system. Economy, constant growing knowledge and human will made drastic ...
1
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1answer
80 views

How could a high medieval 1000bc level tec army use these spells on a large scale battlefield

Magic in this world is not comon but not particularly rare either. Anyone can do it with the proper training and dedication but to be truly great at it can take several decades however it's fairly ...
2
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2answers
113 views

Is this a plausible way for an alien organism to unwittingly cause a mass apocalypse on Earth?

It's around the mid-2300s. Earth is, to put it simply, in trouble. Climate change has resulted in flooding of major coastal cities, displacing billions, which ultimately led to widespread conflict and ...
5
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3answers
188 views

Can Humanity Expand to the Oceans?

Consider a large landmass such as Australia. Imagine if they hypothetically wanted to expand their borders, but they already used up all of their landmass, including the deserts. Could humanity find ...
3
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1answer
77 views

Tidally Locked Planet, Weather

If the polar cap of a tidally locked planet was all ocean, what weather patterns would emerge? The ocean couldn’t be half frozen/half boiling, right? I need a weather pattern so the planet isn’t just ...
4
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3answers
208 views

Is it possible, given modern technology, to fake brain damage?

I'm writing a story, in which it's in a character's best interest to fake a brain-damaged state -- just for a week or two. I know MRI's are available to access brain activity, but would my character ...
5
votes
1answer
75 views

Would it be possible to build a submarine-like city?

I mean as in a city that is not situated at the bottom of the ocean but is not floating on the surface of it either. What would a plausible size and population size be for this kind of construct? ...
3
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2answers
83 views

Harvesting Energy from Gas Giants

In my world, humans live on a moon of a gas giant that has extreme weather conditions. They also: have crystals that can store energy. possess the ability to make floating islands (on which they can ...
3
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4answers
169 views

How Fast Can A Weightless Human 'Swim' On Air Using Medieval Tech?

This world has gravity, air, and clouds. If humans are weightless yet still has mass, it's gonna take some force to accelerate them. How fast can they move on air, say, if they had fins like divers? ...
4
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2answers
103 views

What could be a plausible scientific explanation for a man with radioactive skin that acts like a nuclear reactor?

A bit outlandish, but here me out: I'm trying to make a villain for my story who's essentially like DC's Fallout in powers. Attribution: January 2015, dc.fandom.com/wiki/Fallout That being said, he ...
5
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5answers
124 views

How Would Weightless Creature Steer Itself In The Air? (Can It Sail?)

Gravity does exist in this world, and so does air and clouds. But this creature only has enough weight to stay in the air without falling or being lifted up. It's big like a whale and it does have ...
18
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7answers
5k views

How would a village use its river that it shares with another village downstream?

This question is for a fantasy story loosely based on medieval west Europe. The story is centered around a small remote village in a mountain that sits by a river. The village uses its river for ...
6
votes
4answers
177 views

Anatomy of a chinese serpentine dragon?

In our world there are two species of dragon that took different evolutionary paths due to environmental pressures. The first of them, called smaugs, are as large as a quetzalcoatlus, with a wingspan ...
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1answer
120 views

How would falling buildings affect the earth?

So basically, humankind was t the pinnacle of technological greatness. We had a massive network of floating cities all around the globe. During "The Fall", all the massive spire-like buildings fell, ...
9
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6answers
668 views

Can there be a unique planet visible each different month?

In my world, ten is an important number that shows up frequently. In the solar system my world belongs to, there are ten other planets beside it, and there are ten months in a year. I know next to ...
5
votes
6answers
242 views

Indispensable tools for scavenging

In my world the „apocalypse“ dates back several decades and most people have settled down, the scavenging is left to professional adventurers who roam the less accessible and more dangerous ruins of a ...
2
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8answers
495 views

How can I design a magically-induced coma?

Maleficient is an evil witch on a quest for true immortality. Until she accomplishes her goal, she uses a midpoint form of magic called reincarnation in order to buy her more time and keep her alive. ...
5
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3answers
1k views

Can an immune person be the key to finding a cure to a disease?

At the risk of almost repeating a question I asked some time ago... Scenario: A character has been cured of a deadly disease, but all records of the cure have been destroyed (files, actual meds, etc)....
2
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2answers
68 views

How is the visual luminosity of a star calculated?

My idea is a planet that orbits a red dwarf at a distance in which the apparent magnitude of this seen from the planet is the same as that of the sun seen from Earth. Does this mean that the daylight ...
2
votes
1answer
63 views

How wind patterns and ocean currents would be in a planet that does not rotates on its axis?

Imagine a world that does not rotate in its axis, the planet is not tidally locked so no half is hotter or colder than other. For example the planet does not rotate because it is in a binary sistem ...
6
votes
6answers
214 views

Crazy Alien Genetics

Think of a species (ONLY ONE SPECIES) the individuals all live in the same environment, share the same sentience level BUT are divided into "A", "B" and "C" races which have different number of limbs,...
17
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5answers
1k views

Could a simple hospital oxygen mask protect from aerosol poison?

I'm writing a story in which a character has to make it through an area filled with aerosol poison...or something along those lines. He starts out in a hospital area, with access to equipment. Is it ...
11
votes
2answers
158 views

Symbiotic barnacles for underwater respiration

My world has two races of mammalian mermen, one of which are somewhat monstrous and I'll call them "Abyssals" in this thread. I really want the Abyssals to 'breathe' underwater, as well as being able ...
5
votes
1answer
182 views

Shooting around obstacles with bow and arrow (without magic) [closed]

Bow and arrow are a basic part of many medieval and fantasy settings. Be it for assassins (silent), for (elven) tribes that live in harmony with nature (not industrialized), or to emphasize the skill ...
14
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2answers
333 views

Whip it like Indy

Is it possible to use a whip to seize things or persons like depicted in the Indiana Jones movies (e. g. the whip is wrapped around a root so he can swing over an abyss)? For example a slave trader ...
2
votes
2answers
233 views

Handheld Speargun used out of water for manhunting

Can I have a character make use of a handheld speargun in a postapocalyptic setting to shoot people and pull them back (or at least retain them) with the gun's cord? I came across some criteria/...
15
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7answers
3k views

Biological refrigeration?

Technological approaches to refrigeration tend to involve either high compression ratios of fairly exotic (from a biochemical point of view, anyway) volatile substances, or high-power, low-efficiency ...
10
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10answers
5k views

Given current technology, could TV display screens double as video camera sensors?

This was inspired by this YouTube video titled "Why all solar panels are secretly LEDs (and all LEDs are secretly solar panels)" and the fact that speakers and microphones are similarly related. So ...
1
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0answers
85 views

Could this model for a winged creature with arms work? [duplicate]

Research Birds have: Air foil (i.e., wings that taper at the bottom), Muscles and bones to allow rotating wings forward and down including strong breast muscle, Large lungs, and Hollow bone. The ...
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2answers
146 views

Ancient City Expansion

I want to write about a city in environments like the grasslands in France. Its progress from its rise until its fall. Could the city expand to an empire in one or two generations? (Middle ages ...
6
votes
4answers
177 views

Visible light from the brain

I'm building a magic system where magic isn't just controlled by human brains, but is actively produced there. As a byproduct, when casting a spell, the brain generates a large quantity of visible ...
2
votes
4answers
190 views

What Practical Reasons May Encourage an Empire to Build a War Academy Campus in a Fortress or Structure that can be mobilized for War

I have a large modern fantasy Empire in my setting, and it focuses on the exploits of several students in a military academy. At some point in the story, however, a war breaks out and the academy ...
2
votes
2answers
122 views

Gigantic laser facility with dyson-like reflector network as defensive system. Is it a good idea for my setting?

In my setting, there are sectors in a statist union that take a role of defending union's asset, so the military doctrines in those sectors are designed around defending their own sectors. One of ...
8
votes
2answers
704 views

Can a giant mushroom be used as a material to build watercraft or sailing ships?

The basis for this question is the selected answer for Plausibility of Mushroom Buildings. Prototaxites and braket fungus are the likely candidates but I want to know if this type of fungis can float ...
3
votes
3answers
164 views

How could someone mutate other animals?

There is currently a character I am working on that has the ability to mutate other animals (i.e. make them bigger, tougher, stronger, armoured skin) over a long span of time (Say, 4-5 years). The ...
12
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3answers
543 views

What would make bones be of different colors?

I am currently working in a "fantasy" world without any kind of magic and I thought of a race with different skeleton color (blackish in particular but I want to know in general). I am not well versed ...
5
votes
2answers
139 views

Is my plasma weapon design any good?

I'm currently designing the armory for my far-future hard-scifi setting. Technology is quite advanced and for the purpose of this question assume that liquid metallic hydrogen (LMH from now on) is ...
5
votes
1answer
89 views

How to find the density of a planet and its core taking into account the gravitational compression in them?

Consider a planet $P$ of radius $r$ larger than Earth, whose mass is $r^3$. By the square–cube law, this planet will have the same density as the Earth... assuming that the gravitational compression ...
13
votes
11answers
3k views

Architectural feasibility of a tiered circular stone keep

I have created in my world a keep that lies inside a walled courtyard. Artistically I have designed the keep to rise in three tiers not unlike a wedding cake. (Though the castle is made of stone ...
9
votes
4answers
197 views

Moving mountains

In our world, mountains generally only move up (while forming) or down (while eroding or sinking). Otherwise they follow the tectonic plates they happen to be on. In island chains like the Hawaiian ...
9
votes
7answers
4k views

Would this system work to purify water?

This is part of my generation ship worldbuilding. I mentioned my water purification system in a different question, but I never directly asked about it. Here, I will directly ask about it. I think it ...
1
vote
2answers
131 views

How do I make my main character react realistically to the discovery of a Christian Bible, in a world where it is highly illegal? [closed]

So; I am working on a story that is inspired by my Christian faith to an extent, and I would like the main character to become a "redemptive hero" who becomes a hero by simply helping people to see ...
38
votes
7answers
7k views

Would it be possible to have a GMO that produces chocolate?

I am inspired by some people who apparently believe chocolate milk comes from brown cows. I know that for sweet, delicious chocolate to come into existence, we need to do things to cocoa. Ferment it, ...
23
votes
13answers
3k views

On the feasibility of space battleships

We all know and presumably love enormous space battles with vast battleships doing minimal damage to each other for hours before being blown up by a single fighter. On Earth battleships became big ...
10
votes
2answers
130 views

Algae using UV light from auroras for photosynthesis

I was reading some questions on Quora and I found this claim: The polar regions have a very odd reason for them to have so much oxygen production. You see the Polar aurora run day and night in the ...
1
vote
3answers
99 views

How would someone establish a dictatorship during the zombie-apocalypse [closed]

We're talking about a big group of ~3000 (possibly more) survivors around 5 years after the downfall. 1% of humanity is still alive, 59% is zombified (classic slow zombies, TWD-like), the remaining 40%...
3
votes
1answer
112 views

Will my planet work? (size, gravity, atmosphere)

I was going to sort this all out beforehand, and then write the book, but when the writing flows... you make hay. I am a perfectionist/details-oriented person, but you lose me on math/hard science. ...
6
votes
5answers
157 views

Planetary neighbors

Let's say there is another planet in our solar system that harbours sentient life and this sentient life can build castles, buildings, and other such structures. When would we notice that? We can ...
0
votes
2answers
146 views

Major empires have been destroyed. Results in numerous independent cities [closed]

I'm in the process of building a world for a D&D 5th ed campaign which is due to kick off in the new year and I'm looking for some feedback on a time line, political climate, etc. for the world ...