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19 answers
213 votes
19k views
26 bookmarks
What's the most reasonable way to fit Monsters in your Pocket?
18 answers
193 votes
79k views
75 bookmarks
How could dragons be explained without magic?
20 answers
152 votes
106k views
47 bookmarks
What is the minimum human population necessary for a sustainable colony?
12 answers
143 votes
17k views
38 bookmarks
How do Glass Ants create their tunnels?
11 answers
108 votes
31k views
25 bookmarks
This sword is forged from meteorite iron - but how is that any good?
13 answers
94 votes
19k views
8 bookmarks
A mosque on Mars?
15 answers
82 votes
16k views
14 bookmarks
How Long Could an "Eternal" Fire Last?
30 answers
79 votes
44k views
41 bookmarks
Plausible Reasons for usage of Combat Mecha
20 answers
73 votes
8k views
10 bookmarks
Taxing the superhero industry
12 answers
73 votes
17k views
18 bookmarks
Is it possible to create a practical sword that's naturally toxic?
8 answers
73 votes
7k views
22 bookmarks
How often must carnivorous grassland eat?
13 answers
71 votes
15k views
16 bookmarks
Are flying plants possible?
28 answers
70 votes
18k views
27 bookmarks
How can I prevent the collapse of the Soviet Union?
11 answers
67 votes
16k views
8 bookmarks
Is a pig-mounted cavalry possible?
26 answers
66 votes
28k views
11 bookmarks
Would a full body diamond armor and sword guarantee survival and victory against a medieval battalion?
29 answers
64 votes
12k views
32 bookmarks
What realistic way could limit an FTL drive to only travelling between stars?
12 answers
63 votes
7k views
38 bookmarks
Is there a more effective way to build a language than a word frequency list?
6 answers
63 votes
21k views
53 bookmarks
Other blood colors
28 answers
60 votes
14k views
15 bookmarks
Could extreme climate zones exist next to each other?
12 answers
58 votes
16k views
12 bookmarks
Is a man-eating plant realistic?
21 answers
57 votes
19k views
15 bookmarks
Are gunswords feasible?
3 answers
57 votes
27k views
60 bookmarks
Creating a realistic world map - Currents, Precipitation and Climate
11 answers
53 votes
11k views
18 bookmarks
How could mushroom/fungi forests be possible?
25 answers
53 votes
8k views
9 bookmarks
Lifeform - resistant to gunfire but vulnerable to melee
5 answers
51 votes
9k views
8 bookmarks
How long would people live in the US if an immortality treatment was available?
6 answers
50 votes
23k views
27 bookmarks
What does a medieval army cost?
12 answers
49 votes
8k views
7 bookmarks
How would you know your floating island was losing altitude?
11 answers
49 votes
14k views
5 bookmarks
Could medieval people produce automatic firearms if they had access to the schematics?
12 answers
49 votes
7k views
12 bookmarks
How would a Martian colony be able to celebrate Christmas?
23 answers
47 votes
13k views
11 bookmarks
What would be best way to re-melt Mars' mantle and core to revive its magnetosphere
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