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9 votes
3 answers
2k views

A Glass Window in an Underwater City

5 votes
1 answer
373 views

Is my map believable?

4 votes
0 answers
147 views

Fire in a Hydrogen Atmosphere

9 votes
11 answers
2k views

Underground tunneling without spoil piles

2 votes
3 answers
148 views

How would temperature extremes from summer to winter vary from ours if an Earth-like planet had an orbital period 4 times that of Earth?

6 votes
11 answers
3k views

Is it feasible that cars would be made with a central driving position?

1 vote
4 answers
141 views

How useful (if at all) would these extra arms be?

0 votes
0 answers
111 views

Why would a creature have this sort of societal structure?

8 votes
6 answers
799 views

Talking to Animals

11 votes
4 answers
2k views

The Apollo program on an alternative moon with greater surface gravity

5 votes
1 answer
485 views

What kinds of phonemes can a race with penguin-like barbs be able to make or not?

29 votes
17 answers
4k views

What can be used as reliable, easy-to-understand and hard-to-rig source of entropy for Victorian Age random number generator?

1 vote
3 answers
224 views

Could an alien plant composed of purely stem cells, be very adaptable?

6 votes
1 answer
345 views

How magnitude affects angular diameter/resolution

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