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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.

25
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5answers
4k views

Humans born without legs: how would they thrive?

or, Anatomically Correct Weebles A group of behaviorally modern humans was cut off from the rest of the earth-like planet millennia ago. (Myths hold that the separation occurred four to five ka BP, ...
6
votes
1answer
233 views

Biology of humanlike species within Buddhist and Judeo-Christian Realms [closed]

I have a world that I largely have figured out in a big picture sort of way. It's sort of a Buddhist realms style "multiverse" with multiple realms encompassing the true universe. In this multiverse ...
35
votes
13answers
7k views

Can a river be put under enough pressure to jet straight up for a mile?

I've been mulling over an idea for my preferred RPG setting, and I wanted to check if anyone knows the following: Is it possible for a river to flow underground for miles, and then suddenly be put ...
34
votes
5answers
29k views

Is it possible to genetically modify a being after birth?

In many stories we hear about people whose genetic structure is modified after they're born (Spider-man, The Fantastic 4 and practically any other superhero you care to mention). However current ...
13
votes
7answers
2k views

What is the likelihood that inhabitants of an alien planet similar to Earth geologically would have races?

First off, let's get definitions out of the way: A "race" here is defined as stable, heritable, phenotypic, clearly visual distinction between large demographic groups living in different geographic ...
6
votes
7answers
1k views

How could a force field dome be realized in my city?

In relation to this question, how could I create a force field dome over that city? Specifications of the city: 10 x 40 km on the surface 1 km in height has a city wall of 100 m all around the edge....
19
votes
3answers
8k views

What is the likely method of surviving a Tsunami in a city?

After asking this question, What's the worst natural disaster that could hit New York City in our lifetime, it looks like the most popular answer was a Tsunami. A tsunami, however, from the sources of ...
6
votes
3answers
1k views

What light gas can I have in the upper atmosphere?

I want to have an upper atmosphere composed of a gas which is lighter than "air" so that my human occupants of a planet can harvest it and use it to fill blimps and hot air balloons. I'm planning on ...
14
votes
4answers
1k views

Can whiteout/snowstorm conditions be coupled with heavy fog?

In a story I am working on, I need a scene in which one of the main characters finds himself outside in precarious weather conditions, unable to see unaided much farther out than an armlength or so. ...
54
votes
11answers
14k views

Is a man-eating plant realistic?

Carnivorous plants live in nutrient-poor, highly lit habitats, such as bogs or rocks. For example Earth's biggest carnivorous plant, Nepenthes rajah, lives on mountain-tops with high concentration of ...
9
votes
5answers
3k views

Why would a complete urbanized city-planet exist?

Related: How would a completely urbanized city-planet support its population? How a completely urbanized city-planet be maintained? How would the global environment of a completely urbanized city-...
14
votes
3answers
3k views

What would be the minimum distance between front line trenches in trench warfare?

How close could two trenches be in a stationary war that lasted about 4 months? Specification: Infrastructure should be established and there is artillery in use. The no man's land is mostly plain ...
24
votes
5answers
2k views

Feasibility of anti-matter as a fuel

Now, taking out the cost to produce/collect it, assume somehow we perfected a formula or find a natural source (because that is currently very prohibitive), how feasible would be to use antimatter as ...
0
votes
0answers
76 views

Scientific Accuracy - alien communication ideas [duplicate]

I'm writing a speculative story about aliens coming to earth, and just wanted to bounce a couple of ideas for scientific accuracy (or at least lack of obvious impossibility). This is set in the near ...
45
votes
15answers
4k views

What are the primary triggers for the decline and fall of great empires?

Let's focus specifically on the devolution of empires. How is it that something so powerful falls? The collapse of Rome, Byzantium, the Han, the Mayans and so on. What similarities can be seen in ...
20
votes
4answers
1k views

City in a hollow tree

As a tree grows new layers are added each year so that the trunk expands in radius. The living part of the tree is a relatively thin layer on the outside just beneath the bark, and the wood further ...
60
votes
5answers
3k views

Are geographically typed planets realistic?

In many science fictions we see planets which are designated by a particular terrain type. For example, Dagobah is a swamp planet, Tatooine is a desert planet, and Kamino is an ocean world. However, ...