358 How would Facebook Sysadmins prevent the summoning of Cthulhu? 2015-12-13T17:16:36.307

148 How to take down the internet? 2015-12-14T21:13:14.387

96 How to survive the heat death of the universe? 2016-02-02T11:27:43.143

78 How to stop evil site moderators? ⦋quite firmly closed⦌ 2017-02-22T07:52:09.203

73 How could an apocalypse kill off all adults -- leaving only those under the age of 18? 2017-05-09T14:53:58.280

66 Could a disaster kill all (human) life on Earth but leave astronauts in low orbit alive long enough to return? 2014-10-15T12:29:29.090

65 Architecture of the perfect zombie apocalypse refuge 2015-10-20T18:34:33.927

60 The land grows evil and corrupted ... but why? 2018-01-31T05:19:27.677

59 What is the least expensive way to annihilate humanity? 2015-04-08T21:46:36.717

56 The Benign Apocalypse 2015-06-04T21:34:53.043

52 How to be hidden from world for a year 2016-12-12T09:05:39.597

50 What should three men and three women do if everyone else is dead? 2014-10-27T13:00:10.517

50 Will unattended nuclear power plants actually cause damage to their surroundings? 2016-03-14T10:54:51.600

47 What would be the most effective way of keeping a psychopath with a spaceship from wreaking severe havoc in a suicide crash? 2014-09-17T01:30:40.307

46 What single element could destroy the world? 2015-06-02T20:46:23.320

46 What's the most efficient way to destroy civilization from orbit? 2015-08-13T02:05:21.580

45 Could humanity survive the sun going dark? 2015-02-05T03:53:28.927

40 What happens to an empty, modern city? 2016-02-17T07:44:48.990

39 What could humans do to render the earth uninhabitable? 2014-12-15T16:52:38.767

39 How many people are required for a healthy re-population of the Earth (Post-Apocalypse)? 2015-05-31T01:48:50.003

38 What is the ideal location to hide the President in the case of a zombie apocalypse? 2017-01-02T08:31:01.230

38 What kind of apocalyptic event can be predicted years before it happens? 2017-07-20T23:34:27.410

36 What kind of land transportation can be used for plowing through hordes of zombies? 2016-09-08T03:32:56.830

34 Nuclear apocalypse in a nuclear submarine 2015-09-30T14:39:45.657

34 Why don't future civilizations develop their A.I. to integrate with biology so they can make a sustainable world? 2017-05-16T10:20:03.353

34 Why would the tribes choose herding instead of agriculture in the Great Plains? 2018-09-24T03:14:46.477

33 Why would an army of angels with air superiority fight demons on the ground? 2017-10-09T22:31:07.573

31 How would we try to defuse Yellowstone? 2015-11-25T17:10:13.213

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

28 Plausible Original Concept For High-Fidelity Apocalypse? 2016-12-13T00:10:49.367

28 Can a dedicated amateur astronomer spot a rogue asteroid? 2017-08-29T08:05:05.383

27 Can you buy your way out of the Apocalypse? 2015-09-09T10:01:08.760

25 Automatic nuclear dead man's switch: How should such a device evaluate if a nation is wiped out? 2015-07-30T07:38:39.370

25 How do genetically modified rodents cause the apocalypse? 2018-04-23T17:36:15.677

25 How much time does Earth need to repel interstellar attack? 2018-06-27T06:54:04.813

25 Need a specific event that wrecks the surface, allows the race to survive in bunkers, and affords an aftermath suitable for them to rebuild 2019-01-27T19:05:45.980

24 Would it be possible to detect traces of a civilisation after a world-shattering collision? 2017-03-07T10:22:53.003

24 Could human civilization live 150 years in a nuclear-powered aircraft carrier colony without resorting to mass killing/ cannibalism? 2019-06-24T15:00:49.400

23 Replicating the biblical flood 2015-09-15T02:28:39.980

23 What would happen if magnets stopped working? 2016-01-21T18:27:37.790

23 The World's in Perpetual Winter. How Long Can Humanity Survive? 2016-09-07T04:26:01.970

23 What major event could disrupt planet Earth's orbit around the Sun? 2016-12-29T16:23:14.663

22 Cataclysmic event resulting in a region of glass? 2014-11-07T16:25:26.287

22 Shooting an energy beam into the Sun (from the Earth) in order to destroy it 2014-12-12T14:35:50.457

22 What happens if everything stops? 2014-12-12T16:18:30.860

20 Is there a man-made or natural event that can cause an abrupt climate change within hours/a day? 2014-10-07T06:12:06.637

20 Repeatable, Unavoidable Cataclysmic Events 2014-10-08T11:57:23.847

20 Escaping a dying planet 2015-05-25T06:26:41.507

20 Can a robotic army really defeat humanity? 2016-07-17T22:42:32.887

20 How long could a nuclear warhead remain functioning underground? 2018-12-09T18:22:01.450

20 How large would a mega structure have to be to host 1 billion people indefinitely? 2019-06-18T17:08:53.917

19 What is the likely method of surviving a Tsunami in a city? 2014-10-03T17:09:30.240

19 What are the requirements for the zombie in order to reach a full zombie apocalypse? 2015-05-08T16:46:32.970

19 What would happen to Earth if Yellowstone Erupted 2016-09-19T02:07:37.637

19 Can a 3-laws compliant robot create a non-3-law compliant robot? 2018-06-21T03:47:40.937

18 What kind of event, if any, would knock the moon off its orbit, without destroying it? 2014-10-10T09:09:37.770

17 What would the effects be on a earth-like planet if the magnetic field was much stronger 2015-06-04T21:38:58.353

17 How to desiccate your world? 2016-12-19T10:17:24.587

17 Could the entire world have been destroyed by the existing nuclear arsenal in 1962? 2017-05-09T10:42:53.570

16 How to quarantine a major city? 2014-10-11T14:50:38.413

16 What production of power would be most efficient in a zombie apocalypse? 2016-05-24T19:55:11.767

16 We're in the mountains. Where do we hide? 2017-04-28T13:45:44.890

16 How would we fare against an interstellar RKKV Attack? 2018-06-26T02:05:47.793

16 Worse than zombies, part 1 2018-08-07T13:50:45.853

16 How could a plague that killed off the dinosaurs come back? 2019-01-16T21:06:43.500

15 Could a computer take over an entire planet? 2014-09-30T16:21:49.803

15 Repopulating humans AND zombies 2014-10-13T23:15:20.030

15 How long until a small black hole makes the sun fail? 2014-12-12T19:40:39.380

15 Would a trench filled with mercury stop zombies in their tracks? 2017-01-13T07:02:00.377

15 Would prisons be the havens zombie media makes them out to be? 2017-04-23T06:17:25.653

15 What apocalyptic event would leave a small percentage of humanity alive, but set it back a few hundred years? 2017-10-26T06:56:44.937

15 Plastic and oil eating microbes apocalypse part 1 - How fast can they spread? 2018-12-10T11:01:31.667

15 Can I X-Ray a civilisation to death? 2019-03-29T18:41:32.990

15 2 weeks and a tight budget to prepare for Z-day. How long can I hunker down? 2019-07-29T14:30:28.520

14 Methods of containing/combating "grey goo" Von Neumann nanomachines? 2014-09-22T20:42:23.690

14 What's the worst natural disaster that could hit New York City in our lifetime? 2014-10-03T00:43:40.630

14 What would have to happen in order to force us to live in the ocean? 2014-10-17T23:16:11.683

14 What would happen if a virus could not be cured or contained? 2014-10-28T07:47:32.300

14 Could we still live if Earth's spin speed slowed down by 90%? 2015-01-07T19:49:36.570

14 What could cause Earth to slowly fall out of orbit? 2015-01-11T19:24:48.803

14 Is there a scientifically plausible way to wipe out power & communications in an urban-fantasy Earth? 2015-05-26T19:50:44.007

14 Glass rot - could we survive it? 2015-07-24T12:39:31.950

14 Helping the Soviets to win the race to the moon 2016-12-18T03:30:10.123

14 Little known, relatively unlikely, but scientifically plausible, apocalyptic (or near apocalyptic) events 2019-04-03T22:43:41.033

13 How would a planetary nebula affect a planet? 2014-10-08T16:49:20.187

13 What single event can cause global government communication to fail within a month or less? 2014-10-29T17:58:23.667

13 How to knock down humanity? 2016-08-15T22:05:01.450

12 Surviving in buildings 2014-10-12T14:08:50.833

12 How can a world with constantly-moving nomads form? 2015-01-16T17:40:41.053

12 Building Noah's Ark 2015-05-31T19:17:06.300

12 How likely would a zombie apocalypse be to wipe out civilization in medieval England? 2015-07-23T20:54:49.717

12 How to end the world by earthquake? 2016-05-03T08:41:31.073

12 Would an asteroid of similar size to the one that hit 65 million years ago cause humans to go extinct? 2017-10-20T17:17:58.583

12 What would happen to a modern skyscraper if it rains micro blackholes? 2019-04-05T13:13:20.223

12 How might people try to stop the world becoming a rogue planet? 2019-10-19T16:21:05.167

12 How to make FTL-technology an narratively interesting suicide-pact-technology? 2019-12-03T15:21:43.890

11 If Yellowstone experienced another level 8 eruption on the VEI scale, what are the largest geographical implications? 2014-10-03T13:51:02.560

11 What directive would cause an ASI to put everyone in a benevolent Matrix? 2015-04-06T00:46:02.690

11 Could the Earth be flooded? 2015-06-04T20:02:10.593