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Malady
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20 votes
2 answers
4k views

Is there any generally useful magic that can be done if all it could do was violate the Third Law of Thermodynamics?

20 votes
13 answers
7k views

A non-technological, repeating, phenomenon in the sky, holding its position in the sky for hours

19 votes
7 answers
4k views

Would it be possible for a planet to form so it has all of the landmass in only one hemisphere?

17 votes
4 answers
6k views

How would the history of American colonization by Europeans differ, if the Native Americans were immune to the new diseases?

15 votes
3 answers
1k views

Can humans live on an Earth-like planet where the only difference is that the surface is ~50% water, instead of the ~75% of now?

14 votes
15 answers
5k views

What would society be like if Mate Or Die was in effect for humans and mating also gave the inability to die of old age?

12 votes
8 answers
3k views

How would a medieval person notice that they've traveled back in time?

12 votes
9 answers
2k views

Can you actually have a Forest Kingdom?

11 votes
5 answers
3k views

How long would it take to train a medieval village girl to be a swordsgirl?

10 votes
9 answers
2k views

In a Full-Body VR MMORPG, how I would force confidence?

10 votes
4 answers
2k views

How to justify evolving pointy ears that stick out from your head, on a humanoid

10 votes
10 answers
2k views

How do I keep a language shared by two separate peoples, static for as long as possible? The lower tech-complexity the better?

9 votes
4 answers
4k views

How many deaths can be caused by a Coronal Mass Ejection (Solar Flare)?

8 votes
6 answers
3k views

Can you help me design humans that naturally grow green hair?

8 votes
5 answers
742 views

Can you get modern levels of health care, with no steam engines and no electricity?

7 votes
8 answers
2k views

Larger moon = Larger Tides = No oceanic ships?

7 votes
4 answers
3k views

How would I evolve horns on humans?

7 votes
8 answers
1k views

How dangerous is someone who can make volumes of air act like immovable solids, measured by how expensive an army they could defeat?

6 votes
3 answers
522 views

A city where it doesn't rain in the day, for a month, and can farm on the outskirts

6 votes
5 answers
1k views

How to define the Classical Elements, Scientifically, as ranges of a single property?

6 votes
4 answers
556 views

How to get a Female Archbishop of Canterbury of the 1950s Anglican Church?

6 votes
5 answers
1k views

How would Roman Warfare have changed if they actually had legendary 'flexible glass', and it was cost-effective?

6 votes
6 answers
699 views

How do I create a societal collapse with ruins, while the tech can make Ridiculously Human Military Androids?

5 votes
4 answers
221 views

How would beliefs be different if humanity started with perfect memory? [closed]

5 votes
4 answers
549 views

How would paleolithic combat work in a world where you have instant, and permanent mastery when you hold any tool?

5 votes
2 answers
562 views

What if every animal as large as, or larger than, a horse, went extinct during the last Ice Age?

4 votes
5 answers
2k views

How to make plasma manipulation powers, on equal power with phases of matter, without material generation powers?

4 votes
5 answers
2k views

Horses went extinct, people domesticated something else. - What is it and what would change?

4 votes
3 answers
273 views

How could we use Starlite in warfare?

3 votes
2 answers
297 views

Carbon-based life planet with a plenitude of infinite energy crystals. Could it exist?