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SF.'s user avatar
SF.'s user avatar
SF.
  • Member for 9 years
  • Last seen more than a week ago
31 votes

Lifeform - resistant to gunfire but vulnerable to melee

26 votes

How would aliens in orbit know that communications from Earth are legitimate "official" communications?

20 votes
Accepted

How to keep an authoritarian state from scientific stagnation?

18 votes

How might the actions of descendants matter for their ancestors? (reverse causality)

18 votes

Is a condition leading to a cold-blooded human possible?

17 votes

How would the constant presence of an affable, undemanding immortal affect a society?

16 votes
Accepted

Hiding own space program

16 votes

Dwarven Clothing - Metal Only is uncomfortable, Cotton could be Deadly

15 votes

Air transport breaks down

15 votes
Accepted

How can I create a poison that kills a person after a specific amount of time, and is treatable by an antidote?

13 votes
Accepted

Faking first contact

11 votes
Accepted

Growing a city (literally)

11 votes
Accepted

Would white pupils/irises on an animal allow it to see properly?

10 votes

How powerful of a computer do I need to simulate and emulate a human brain?

10 votes

What power generation method is the best to sustain a hovering city?

9 votes

How to Catch a Dream Thief?

8 votes
Accepted

Dangerous salty creature killing the triffids

8 votes

Are diamond berries possible?

8 votes

What kind of recurring phenomena could cast darkness on a planet for days/weeks at a time?

8 votes

FTL travel is impossible. How is interstellar trade possible?

7 votes
Accepted

What phenomenon/situation would thwart the development of electronics by a society?

7 votes

Crystalline materials in someone's bloodstream -- what effect would they have?

6 votes

How could a human and an animal swap minds?

6 votes

How can I get my DeLorean to 88 miles per hour without a train?

6 votes
Accepted

What events could keep Zeppelins in the air today?

5 votes

Help! My Mother-in-law got Mind-Uploaded and now pesters me through the surround system

5 votes
Accepted

What would be a more efficient reservoir for biological hydraulics?

5 votes
Accepted

Rational justification for discrimination

5 votes

Can an ice age last for only 40 years?

5 votes

Uproot, Lift Up and Replant a City