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For questions that ask if a given concept is consistent, or being used consistently, in the context of the referenced world rules. Answers should say yes or no, with supporting info. This tag should not be used with the science-based, hard-science, or science-fiction tags. Comparisons to the real world should use the science-based tag. This tag may not be used alone. This tag may not be used with the science-fiction, science-based, or hard-science tags.

16 votes
9 answers
6k views

How believable are "X-ray sights"?

Can a see-through sight be built that is small enough to be mounted on something the size of a sniper rifle? It does not need to be based on X-rays; ultrasound, mesons, neutrons... everything that ex …
SilverCookies's user avatar
2 votes
1 answer
317 views

How to start a Venus syndrome?

A terrorist group threatens to start a runaway greenhouse effect by releasing tetrafluoromethane into the atmosphere. How much gas do they need to do that on earth?
SilverCookies's user avatar
0 votes
7 answers
830 views

Where to put a tracking implant? [duplicate]

A small device, the size of a grain of rice, is implanted in a number of individuals to track their movement. These individuals are usually compliant but being tracked is also not exactly in their int …
SilverCookies's user avatar
5 votes
6 answers
798 views

Geoengineering for dummies

My human civilization is facing (much like us) the threat of anthropogenic climate change. For whatever reasons, they are unwilling to take action by reducing the use of fossil fuels and refuse to use …
SilverCookies's user avatar
24 votes
6 answers
9k views

How realistic are explosive collars?

They are relatively rare in fiction but there are a few interesting examples, in fact I even remember reading about one in real life. I would like mine to be small and light (say less than 0.9 kg and …
SilverCookies's user avatar
1 vote
Accepted

What animals would be quickest to adapt to a low gravity world?

I would say almost any animal. smaller animals are "less susceptible" to gravity changes since being smaller they have a lower volume/surface ratio, so with a 0.72 g they would barely notice. water …
SilverCookies's user avatar
1 vote

Can We Build Erebor

We can most certainly build such a structure. We build all kind of structures underground and within mountains. check out these idiots! And take the virtual tour of their temple. We build tunnels …
SilverCookies's user avatar
-1 votes
2 answers
107 views

Can we make a Dividual with current technologies? [closed]

A Dividual is a copy of a personality surviving in more than one body. Obviously, the availability of more futuristic tech (like the neural lace) would make it way more belivable. What I'm thinkin …
SilverCookies's user avatar
5 votes
5 answers
1k views

Can my character build an atom bomb? [duplicate]

This person is kinda of a show-off. He wants to build a nuclear weapon simply to impress everyone because he's a smartass. He means no harm, fissile and explosive components are replaced with inert …
SilverCookies's user avatar
34 votes
9 answers
7k views

How realistic is a dirty bomb for area-denial?

I need a city-sized (10 km2 minimum) area to be declared inaccessible for 50 years minimum. My thought was to justify this with a dirty bomb attack of some sort. Radiological dispersal devices (RDD …
SilverCookies's user avatar
11 votes
7 answers
8k views

Can I keep a person unconscious for a long time? [closed]

Is there a reliable and, at least, relatively safe way to keep a person unconscious for a period of at least a year(more would be better)? It doesn't really matter whether the individual is comatose …
SilverCookies's user avatar
5 votes
4 answers
768 views

Skysteading: How to build a flying city

I am building a city in the sky; it floats thanks to hot air balloons and hydrogen. The main issue I have is how to make it grow, as this is not some kind of giant structure to start, it is a small(is …
SilverCookies's user avatar
7 votes
5 answers
1k views

What could be an energy source for an underground civilization?

A mostly autonomous city exists deep underground inside a mountain. They enjoy a modern level of technology and engineering. Other than nuclear power what energy sources could they harness to power th …
SilverCookies's user avatar
12 votes
4 answers
764 views

Floating buildings on Venus. What shapes are credible?

Venus is being paraterraformed with floating cities. Mechanical machines collect material from the surface and send it floating at an altitude of about 50 Km where conditions are more Earth-like. Here …
SilverCookies's user avatar
107 votes
24 answers
19k views

A believable place for your secret lair

In a modern, "western" country, where can I set my secret facility so that authorities won't find me for about 30 years? The needed amount of area is relatively large, a bit less than 200 m2. The fac …
SilverCookies's user avatar

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