User Jasper

22 votes

Plausible reason why my time machine can only go back a certain amount of time?

answered Jul 30, 2018 at 5:59

20 votes

Motivations for interstellar colonizations

answered Nov 29, 2014 at 3:27

19 votes

What are the evolutionary benefits of mating for life, as opposed to serial monogamy?

answered Oct 30, 2015 at 0:26

19 votes

Accepted

What could have made a species of strong magical beings extinct?

answered Mar 17, 2016 at 22:45

17 votes

How could an apocalypse kill off all adults -- leaving only those under the age of 18?

answered May 10, 2017 at 17:19

14 votes

Is It Possible to Have Different Sea Levels, Eventually Causing New Landforms to Appear?

answered Sep 18, 2019 at 18:14

12 votes

Medieval airlocks, would they be possible?

answered Nov 24, 2018 at 6:50

11 votes

How might boat designs change in order to allow them to be pulled by dragons?

answered Jul 1, 2019 at 3:44

11 votes

Effects of "tax your vote" political system

answered Jan 25, 2016 at 4:07

11 votes

Can a habitable planet have two separate crusts, both of which can sustain life?

answered Jul 26, 2018 at 6:06

11 votes

How can spacecraft manufactured on the moon be powered?

answered Nov 20, 2018 at 15:52

9 votes

Why would someone want to be free if slavery offers better quality of life?

answered Nov 18, 2015 at 6:58

9 votes

What would cause a nuclear power plant to break down after 2000 years, but not sooner?

answered Aug 16, 2019 at 0:26

7 votes

How might boat designs change in order to allow them to be pulled by dragons?

answered Jun 30, 2019 at 23:17

7 votes

How can I poison humans over several generations?

answered Mar 9, 2017 at 17:19

7 votes

What's the most likely "post democracy" form of political government?

answered Nov 3, 2015 at 19:35

7 votes

Aerial combat: winged humans

answered Apr 27, 2018 at 0:20

6 votes

Could guy with offline wikipedia (and solar charger) that was transported into middle ages conquer the world?

answered Nov 11, 2018 at 22:26

6 votes

Why would characters spend time answering imaginary questions to fictional hypotheticals?

answered Oct 3, 2018 at 6:12

6 votes

How long can a nation maintain a technological edge over the rest of the world?

answered Apr 23, 2019 at 23:47

5 votes

Accepted

160 Year Solar Orbital Period & 1.9 Year Moon Orbital Period - Is it possible?

answered Mar 1, 2019 at 14:07

5 votes

What can plausibly explain many of my very long and low-tech bridges?

answered Jun 2, 2019 at 5:57

5 votes

How do dwarves defend their City-under-the-Mountain from a dragon?

answered Nov 14, 2018 at 5:25

5 votes

Is there anyway life could survive a nuclear apocalypse realistically?

answered Jun 30, 2018 at 7:22

5 votes

What would the buildings in a city on a marsh be made of?

answered Aug 4, 2018 at 15:24

5 votes

What's the most likely "post democracy" form of political government?

answered Nov 3, 2015 at 21:16

4 votes

Economic and geopolitical effects of building a space elevator?

answered Dec 1, 2014 at 5:59

4 votes

Why wouldn’t they try to re-invent automobiles?

answered Apr 6, 2018 at 22:14

4 votes

Forcibly drawing power from a higher being, examples?

answered May 4, 2018 at 4:30

4 votes

Why would my billionaire have health insurance?

answered May 31, 2018 at 6:57

Stack Exchange Network

111 Answers

Plausible reason why my time machine can only go back a certain amount of time?

Motivations for interstellar colonizations

What are the evolutionary benefits of mating for life, as opposed to serial monogamy?

What could have made a species of strong magical beings extinct?

How could an apocalypse kill off all adults -- leaving only those under the age of 18?

Is It Possible to Have Different Sea Levels, Eventually Causing New Landforms to Appear?

Medieval airlocks, would they be possible?

How might boat designs change in order to allow them to be pulled by dragons?

Effects of "tax your vote" political system

Can a habitable planet have two separate crusts, both of which can sustain life?

How can spacecraft manufactured on the moon be powered?

Why would someone want to be free if slavery offers better quality of life?

What would cause a nuclear power plant to break down after 2000 years, but not sooner?

How might boat designs change in order to allow them to be pulled by dragons?

How can I poison humans over several generations?

What's the most likely "post democracy" form of political government?

Aerial combat: winged humans

Could guy with offline wikipedia (and solar charger) that was transported into middle ages conquer the world?

Why would characters spend time answering imaginary questions to fictional hypotheticals?

How long can a nation maintain a technological edge over the rest of the world?

160 Year Solar Orbital Period & 1.9 Year Moon Orbital Period - Is it possible?

What can plausibly explain many of my very long and low-tech bridges?

How do dwarves defend their City-under-the-Mountain from a dragon?

Is there anyway life could survive a nuclear apocalypse realistically?

What would the buildings in a city on a marsh be made of?

What's the most likely "post democracy" form of political government?

Economic and geopolitical effects of building a space elevator?

Why wouldn’t they try to re-invent automobiles?

Forcibly drawing power from a higher being, examples?

Why would my billionaire have health insurance?