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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.

4 votes
7 answers
905 views

Restarting civilisation

There are a lot of disaster movies out there, usually featuring some kind of massive population collapse. I've been wondering about "What happens afterwards?" For a short enough disaster, I'd imagine …
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7 votes
4 answers
623 views

Counterbalancing a Ringworld so it doesn't explode

Ringworlds are a bit of a SciFi staple but as they're commonly portrayed, the large ones have a major problem... they'd, well... explode if they were built out of materials that actually existed. This …
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3 votes

How would the Death Star laser really work?

It's highly likely your laser of doom will actually start generating antimatter. See, when you focus a powerful enough laser into a small enough spot, you start generating electron-positron pairs (thi …
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  • 4,697
2 votes
4 answers
1k views

What are the energy requirements of moving some of Venus' atmosphere to Mars?

Say we built two large scale portals and sent one to Venus and one to Mars much like in this question but with portals large enough that mass flow rates are not an issue seeing as nobody wants to wait …
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23 votes

Will interplanetary shipping even be necessary in a future with nanofabricators?

I think there will always be a need for long distance goods shipping, it's quite likely that large factories will still exist loooong into the future for the main reason that it will always be much fa …
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59 votes
23 answers
19k views

The 10,000 year skyscraper

If someone wanted to construct a skyscraper (bigger being better) that would survive thousands of years without maintenance, what would they make it out of? It can be built from any plausible current …
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  • 4,697
3 votes

How could a planet have plate tectonics but zero or weak earthquakes?

Presumably if it either had very soft tectonic plates or if they were well lubricated. Earthquakes occur if, during subduction (technical term for one plate being shoved under another), one plate gets …
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9 votes

Extremely compact nuclear reactor?

There already are some nuclear batteries around the size of a AA or so, but you'd be hard pressed to power a pocket calculator with one, the trick is to pick a fuel that doesn't emit neutrons or gamma …
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1 vote

Humans Achieve Massive Increase In Average IQs -- But How?

The IQ test is a bit of an arbitrary metric with scores that vary not just over time, but between different IQ tests too, in some cases up to 20 points or so. Having said that, the meaning of "a IQ sc …
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44 votes

Can guns be rendered unusable by changing the atmosphere?

Considering the propellant in all munitions that I'm aware of (except fuel-air bombs and spud guns) is self-oxidising, that is to say, it requires nothing from the atmosphere (guns and bombs work fine …
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