Robert Rapplean's user avatar
Robert Rapplean's user avatar
Robert Rapplean's user avatar
Robert Rapplean
  • Member for 2 years
  • Last seen this week
87 votes

How can a post scarcity Society not be hedonistic?

51 votes
Accepted

How far in the past could a highly-trained survivalist live?

36 votes
Accepted

Could a race create a 1 Megaton non nuclear explosion?

31 votes

Could a submarine 'sail' the ocean currents?

23 votes

Why would/wouldn't *humanoid* robots become popular, rather than any other robotic body-form?

23 votes
Accepted

How deep underground could a city plausably be?

23 votes

How can plants reliably intentionally poison those that eat their fruit?

22 votes

Could a gene be added to people that would stop them drinking?

22 votes

Would fixed-wing aircraft still exist if helicopters had been invented (and flown) before them?

19 votes

What are the repercussions of two asteroids in the asteroid belt colliding?

18 votes

Is a "20th century" spacefaring civilization plausible?

18 votes

Velocities in space without using massive numbers

18 votes

Can CRISPR technology be used to create ‘super soldiers’?

16 votes

What if you could shut off the pull of gravity on your body?

16 votes

How can I force humanity to retreat to the ocean floor

16 votes

Would it be possible for modern firearms, such as an AR-15, of any variation to survive an apocalypse?

15 votes

What disease affects only the non-peasants?

15 votes

Could a species with human-like intelligence keep a biological caste system?

15 votes
Accepted

Could a society develop without any time telling device?

15 votes

Can I use the Peltier effect to cool down an underground city on Venus

13 votes

How to make a Stanford torus start rotating?

13 votes

is there any way to make firearms work in a fantasy setting alongside swords and armor and stuff?

13 votes

What coordinates on Earth would provide the most arable land for a large island?

12 votes

Usability of Silver and its alloys as standard building material

12 votes
Accepted

When are Turreted Railgun better than Spinally-Mounted Railguns?

12 votes
Accepted

Would salt mines, lakes or flats be reasonably found in high, snowy elevations?

11 votes

Is it possible for a plane to be fast yet strong enough to be able to pierce a plane in the air?

11 votes

Is this concept for very low energy space travel plausible?

11 votes

How do I store enormous amounts of mechanical energy?

11 votes

Is there such a thing as "too much detail" in worldbuilding?

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