Dallaylaen
  • Member for 6 years, 3 months
  • Last seen more than a month ago
Given an "indestructible" material used for armor - what are ways to explain that material not being used as a weapon as well?
21 votes

I second the kevlar answer, but here are soe thoughts as well. There is such thing as non-Newtonian fluid which flows quite easily when pushed slowly but becomes almost rigid when you hit it. Google ...

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porting knowledge
6 votes

I second paper books, though carrying around a reader as well may be worth trying. No matter how good the textbooks are, they assume a student being surrounded by the very civilization you want to ...

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Is it feasible to break rock into core components?
6 votes

Possible, but you're unlikely to need much of it. A vegetation capable of feeding a population would also generate enough oxygen to support it. Here's why. Humans and other animals use oxygen to ...

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The time locked vault will open in accordance with the prophecy
5 votes

You can hide it in a buoyant sealed sphere on the ocean floor. There is a thin chance of accidental discovery, but not much of it. The prophecy should contain coordinates. Additionally you could ...

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Rare and long-lived humans
Accepted answer
5 votes

Roughly 1% transfer chance is achievable. Suppose you have a gene that is useful if you get one copy, but fatal if you get two (think sickle-cell). Now if you breed with a normal person, 1/2 the ...

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Ice and sand deserts next to each other
4 votes

A sandy desert in a cold region actually exists on earth. I'm no geologist, but given right landmass, mountain, and air currents configuration it looks like it can be moved to the north and/or made ...

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How to make magic different from science
3 votes

To answer this question, one must first define science. Luckily enough, a definition exists and is very specific. To make advance via science, one must do the following (I admit I'm just copying over ...

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Concealing my earth-changing invention
3 votes

I'm sorry but I could not resist posting yet another answer here. Here is a sketch of a strategy that works. Accept the inevitable: you will get noticed. So instead of hiding, become a media person ...

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Is it possible to have a planetary system with planets having perfectly synchronized orbits?
2 votes

Short answer: still impossible. Given the other answers, the closest thing to what you want I could think of was an Earth-like planet captured near a much bigger planet's Lagrangian point L4 or L5. ...

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The really really big mountain
2 votes

DISCLAIMER I'm not a geologist. I would love to have one correct me on the following. A lone mountain significantly higher than its surrounding is very likely a volcano. Bear that in mind. A long ...

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How to turn an ocean planet into an Earth-like?
1 votes

Just some thoughts. 1) Pump the water to the poles and freeze it there. Ice is rather reflective so it would keep itself from melting for some time. You'll have to worry about possible cough climate ...

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Constantly sunlit/shadowed regions and weather
1 votes

I think the crater would just fill with ice (water, of CO2 if the atmosphere is very dry, but it won't stay THAT dry with average 15 C and any open water source). It looks like deepest parts of ...

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Exploring deep ocean at 1GPa with minimum metal available
1 votes

Posting an answer to my own question here just to share some further thoughts on the setting. Magnesium Magnesium is abundant in seawater. It is also light, stiff, and hard metal, although subject ...

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Lead-Zeppelin–Would this be possible?
1 votes

No matter how dense is the gas within, the lifting force is limited by the mass of displaced air. Air density is around 1.3 kg/m^3, giving a theoretical upper limit of 260 tonnes. Hydrogen (both light ...

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Planetary siege
1 votes

Assuming the following: the planet is self-sustained; both sides are at comparable/same tech level; the defenders are capable of destroying the invading fleet if it comes close (as in @Jim2B's answer)...

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If an FTL spacecraft entered Earth orbit, how long would it take for humans to build a FTL spacecraft?
1 votes

Not really an answer, but some thoughts for the sake of completeness. 1) Given that Thull ship was in the Earth orbit, most of the debris which are not evaporated by the nuke would enter the ...

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A different kind of atmosphere, what gasses other than oxygen could be used by alien life forms?
0 votes

I won't find links now, but reaction CH4 + H2O + light -> [sugar] + 2H2 is possible and requires 4 times less energy than normal photosynthesis. Therefore, the reverse reaction of reducing sugars ...

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