179 How might modern humans leave a message for 50,000 years? 2014-10-31T23:48:39.727

105 How fast can I flood the Netherlands entirely and permanently? 2018-06-18T19:04:54.990

88 Great Old Ones Limited, or Why does Cthulhu need a Company? 2018-02-05T00:26:10.507

69 Can a human colony survive on a 'hot' world? 2019-12-10T11:26:55.980

54 Would gorillas with human-level intelligence make effective soldiers? 2016-02-24T20:26:48.890

54 Reasons why healthy people would intentionally want to get infected? 2017-09-17T08:51:39.123

54 What skills would an early-1500s era ship captain need to learn to become a modern-day sailor (and eventually a captain again)? 2018-01-13T23:54:11.160

52 What US states are most likely to rebel? 2015-08-26T16:01:08.990

52 Fallout from aliens destabilizing economy by counterfeiting all global currencies? 2017-02-05T19:36:07.577

51 Dragons and aviation bureaucracy 2015-01-21T12:51:14.833

46 Where on Earth is it easiest to survive in the wilderness? 2019-09-03T23:01:44.457

45 Could humanity survive if all except a few males died in a plague? 2016-06-09T11:14:35.553

45 Famous conjecture or unsolved problem that could be plausibly proven/solved by freshman mathematician? 2019-11-03T20:18:16.110

44 What are the enabling factors for melee combat in modern or future settings? 2014-10-30T17:41:06.047

43 A person from medieval times comes into our time. What would he notice first? 2015-09-12T21:22:37.507

43 How would modern naval warfare have to have developed differently for battleships to still be relevant in the 21st century? 2019-06-18T06:31:29.053

40 Where could a person from the 14th century appear such that they would not notice modern technology for a week? 2016-09-02T21:41:33.030

39 Most effective long-term zombie killing weapon 2015-05-13T16:33:56.803

39 How to realistically create a bow that's also two one-handed swords? 2017-03-09T09:15:00.790

38 In modern day combat, what would warrant singing during battle? 2018-08-26T13:11:30.573

37 How long can an abandoned, semi-sheltered computer remain bootable? 2014-12-07T02:48:19.427

37 What would an Earth with no timezones be like? 2016-01-11T16:35:24.560

37 Modern soldiers carry axes instead of combat knives. Why? 2016-09-30T15:22:50.473

34 Why is super hero technology never used by civilians? 2019-11-11T22:39:01.813

32 Which jobs could western geniuses, who lived between 1643-1900, have in the modern age related to their talents? 2018-08-10T12:22:38.493

31 How do the zombies win when they're so weak? 2016-03-09T20:57:36.040

31 Could we still plunge modern civilization into another black death? 2017-01-09T09:04:23.407

31 Are there any mathematics that could only be learned by very few people? 2019-10-25T18:45:56.393

30 How far away could Earth detect a projectile travelling at relativistic speeds? 2015-05-06T11:15:13.010

30 What is a city like after a hundred years or so of neglect? 2017-02-21T16:19:56.747

30 What do fairies wear and how can they evade detection by our cameras? 2020-02-18T03:02:29.483

29 Why would people let a super tree grow? 2017-11-23T09:15:01.560

28 In modern world, what is the largest building that could be built overnight? 2017-02-17T19:37:32.120

28 How much smarter would bred humans become? 2018-10-05T12:01:39.737

27 How would the constant presence of an affable, undemanding immortal affect a society? 2015-04-06T02:07:30.617

27 Ergonomically correct eagle riders in the modern age 2017-10-04T04:41:52.637

26 Is it possible to have a wealthy country without a middle class? 2019-06-04T17:22:06.010

25 What would it take for Jane Doe to craft a book from scratch? 2017-01-03T17:12:42.593

25 Is it possible to have battery technology that can't be duplicated? 2019-06-10T21:08:53.907

23 Regulating the usage of magic in the modern era 2014-09-16T18:50:12.500

23 Would we notice ridiculously healthy birds? 2017-04-26T22:41:55.607

22 How would a city police department handle a super-hero joining as an officer? 2018-01-01T01:49:00.917

22 How can medieval knights protect themselves against modern guns? 2019-11-20T04:16:17.863

21 Seal off a modern town 2017-08-19T12:51:42.903

20 Fighting a dragon with modern military units (or Smaug vs. a MEU) 2016-10-29T01:10:29.403

20 How could a smaller country successfully take control of a much larger country? 2016-11-29T22:35:04.527

20 How to keep apartheid alive? 2017-04-23T11:30:25.753

20 How to design tentacle massage machine? 2017-05-23T13:08:31.020

20 Economic super power with little political clout? 2017-06-26T14:46:51.433

19 How would a magician trick scientists into believing he is using science? 2015-07-13T18:15:43.727

19 Can one guy with a duplicator initiate a nuclear apocalypse? 2019-09-16T16:16:09.143

15 Most effective method of creating fear? 2017-01-29T19:23:15.653

15 Multiple fireplaces in an apartment building? 2019-04-24T16:46:18.683

14 Is non-manmade pandemic a realistic threat to modern first world? 2015-07-01T14:44:40.683

13 Implications of a world where mercenaries are more capable than most militaries? 2015-03-20T21:07:26.777

13 Spells that would be effective against a modern day army but would NOT destroy a fantasy one 2019-02-22T00:43:11.460

13 How could hackers cause mass destruction to major cities using existing satellites? 2020-02-14T04:40:05.580

12 Defeating the revised Snakebot of Doom 2016-03-03T01:45:33.350

12 How long can New York City sustain the Snakebot of Doom's hunger for Iron and steel? 2017-06-17T02:32:21.903

12 Why would guns not work in the dungeon? 2019-07-11T13:45:29.780

12 How to prevent criminal gangs from making/buying guns? 2019-08-14T16:56:09.587

12 Could a small private island protect its sovereignty? 2019-10-02T05:37:56.023

11 Modern Body Armor for Medieval Style Weapons 2016-09-14T19:52:20.387

11 How to create traps that only kill someone if they try to help another and aren't obviously the work of a seriel killer? 2017-01-17T18:08:37.423

11 How long would it take to discover a large Island appearing in the ocean? 2018-05-26T07:00:56.507

11 A supermassive black hole is coming our way. When's the latest that we would notice? 2018-12-07T15:58:52.340

10 Air routes around a “hurricane eye” on a tidally locked planet 2017-05-11T11:00:30.980

10 Is it plausible to make human gametes from different parent chromosomes? 2018-11-09T14:45:20.000

9 How can one "under-average Joe" fight monsters? 2015-12-24T23:56:43.547

9 How to peacefully convert your dictatorship to a democracy? 2018-07-30T21:53:31.483

9 What's the crew composition of any modern small attack submarine sub? 2019-06-01T06:04:56.343

8 Dragons and aviation bureaucracy, the sequel: Dragons on Instruments! 2015-01-22T02:33:25.270

8 Everything organic you see turns to ash; extent of damage 2015-09-09T09:53:55.870

8 Fantastical acceptance 2016-05-12T14:58:13.323

8 Building an Anti-Supervillain task force 2018-08-25T22:55:28.437

8 What transportation for snow city? 2019-11-26T06:31:34.310

7 How to cut corners while rebuilding after apocalypse? 2016-09-01T20:28:15.263

7 Which voltage and frequency would be selected if there were no legacy issues? 2016-09-20T20:22:37.903

7 Fiction Accuracy: American Nightmare 2016-10-26T07:21:50.353

7 Killing a mind controller 2017-01-30T13:54:19.537

7 How to make rich have more children? 2017-06-25T19:04:51.787

7 How to calculate maximum altitude difference between metro stations? 2017-07-20T09:01:49.587

7 Why might modern demigods be unable to use guns? 2017-12-19T03:03:08.520

7 How to keep an Island civilization secret from the rest of the world? (Modern Age) 2018-01-12T01:39:45.210

7 Making airships\blimps\dirigibles the dominant form of air transport 2018-08-30T21:09:56.917

7 Let's plot a course between Earth and Gor 2019-01-01T14:18:09.337

6 Monolithic vehicles vs a convoy; So you want to go on a road trip 2016-02-26T15:36:38.423

6 Defeating the Snakebot of Doom 2016-03-02T05:52:22.353

6 Golden/Silver Age Superhero Societal Acceptance Reality Check 2016-08-16T18:07:59.880

6 Fighting a dragon with modern military units Part II: Airborne First Encounter 2016-11-18T23:15:35.313

6 Is an assault rifle that can in emergency also use pistol ammo realistic? 2017-04-08T15:39:32.287

6 What kind of a tax system would encourage well-off to have many children? 2017-07-22T14:07:28.377

6 Would modern body armor be much more useful for creatures that only cared to protect their heart 2017-11-06T22:15:06.103

6 Economy in a society where 99% of the world adult population is owned by the other 1% 2018-07-08T06:54:15.010

6 Why would a war be the most traumatic for the winning side just before the enemy capitulates? 2018-11-12T21:14:20.793

5 What would be the main societal changes if we invented a free and unlimited energy source tomorrow on earth? 2014-09-21T18:06:36.573

5 Dragons and aviation bureaucracy, part 3: Plopping a Dragon into Today's World (or Papers, please, big fella) 2015-07-12T00:05:36.943

5 Best way to reveal your group of magic users 2015-09-16T19:24:27.563

5 How would rapid healing affect modern small scale combat tactics and weapons? 2015-12-15T18:00:50.460