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Philipp's user avatar
Philipp's user avatar
Philipp's user avatar
Philipp
  • Member for 9 years, 7 months
  • Last seen this week
82 votes
11 answers
83k views

How many people can you feed per square-kilometer of farmland?

69 votes
11 answers
14k views

The first McDonald's restaurant on Mars

61 votes
20 answers
13k views

Why would anyone build robots when they have human rights?

60 votes
15 answers
10k views

What circumstances could lead to city layout based on hexagons?

50 votes
20 answers
13k views

Why would people still use pump-action guns in the future?

19 votes
6 answers
4k views

Permanent river of lava

17 votes
8 answers
2k views

How can a prison offer a safe way for inmates to commit suicide?

17 votes
3 answers
1k views

Where to place industry in a megastructure?

8 votes
1 answer
2k views

Could Jupiter moon Europa become habitable when the sun enters its red giant stage?

8 votes
8 answers
850 views

What would be a plausible speed for a 22nd century military ship?

7 votes
4 answers
5k views

How powerful does an orbital laser cannon need to be?

6 votes
6 answers
554 views

How would the appearance of Earth from orbit change when it would be rendered uninhabitable?

5 votes
4 answers
361 views

What properties would make a plant ideal for use on a space ship?

4 votes
5 answers
190 views

What system could incentivize medical care to keep all people as healthy as possible? [closed]

4 votes
6 answers
646 views

How to encourage an interstellar space industry to decentralize production processes?

1 vote
5 answers
318 views

How to create a MacGuffin planet? [closed]