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ckersch
  • Member for 9 years, 5 months
  • Last seen more than 1 year ago
89 votes
11 answers
13k views

What would be the best way to get clean, drinkable water in a medieval city?

71 votes
27 answers
9k views

Can humans interact meaningfully with the economy when robots are better at everything?

70 votes
10 answers
11k views

Are there any ways to allow some form of FTL travel without allowing time travel?

61 votes
7 answers
12k views

How far away would an alien civilization need to be for us to not notice them?

57 votes
9 answers
9k views

What would the fortifications of an underwater city look like?

57 votes
11 answers
12k views

What would be the best way to fight a duel with lightsabers?

57 votes
12 answers
12k views

Would gorillas with human-level intelligence make effective soldiers?

53 votes
2 answers
16k views

How would winds behave on a tidally locked planet?

40 votes
16 answers
9k views

What could humans do to render the earth uninhabitable?

36 votes
4 answers
31k views

How long would it take for a forest ecosystem to overtake New York City?

36 votes
6 answers
13k views

Are hoofed bipeds feasible?

30 votes
8 answers
16k views

How many survivors would be left after a global nuclear war?

29 votes
7 answers
3k views

How could bird people map the air?

26 votes
9 answers
8k views

What advantages would bovines have over horses when used as cavalry?

25 votes
6 answers
3k views

What's the highest population the Earth could possibly sustain?

23 votes
9 answers
3k views

Is there any feasible way to inhabit the sun?

21 votes
6 answers
5k views

Why would people use flapping-wing instead of fixed-wing aircraft?

21 votes
3 answers
5k views

Would an island-covered planet be possible?

20 votes
6 answers
6k views

Would building a Dyson sphere inside the Earth's orbit render our planet uninhabitable?

19 votes
22 answers
7k views

What traits or behaviors would favor female warriors over males?

16 votes
13 answers
3k views

How could war be replaced by sports?

15 votes
2 answers
1k views

How far could a planet be from its star and still be kept habitable by intense greenhouse gases?

13 votes
6 answers
4k views

Would it be possible to ride a gravitational wave?

12 votes
7 answers
4k views

What determines whether or not tribes will form into larger groups?

12 votes
10 answers
2k views

How would life evolve, or could life be engineered to live, in the absence of an atmosphere?

12 votes
5 answers
3k views

Could life evolve in the degenerate era of the universe?

11 votes
9 answers
3k views

How would cloned neanderthals fare in modern society?

11 votes
8 answers
2k views

How could a civilization without war evolve? [duplicate]

11 votes
6 answers
1k views

Can hive-based aliens develop advanced technology without telepathy?

11 votes
9 answers
1k views

What goods would be worth trading between Earth and Mars?