555 How can Santa keep his lists when the GDPR is around? 2018-06-04T13:54:38.257
301 Tomorrow is Groundhog Day... For everyone. How does society respond? 2015-05-27T19:20:24.217
246 What's the smallest change to physics required to allow magic? 2016-04-29T10:18:21.727
224 How to safely check if you are immortal? 2017-10-06T09:16:13.887
216 Is there a single historic event which could be changed to cause the USA to use SI units? 2018-10-14T13:50:28.540
205 What's the most reasonable way to fit Monsters in your Pocket? 2016-07-14T17:18:32.683
173 Russian Dolls - How do they reproduce? 2019-01-31T10:23:20.467
150 If time travel is possible in the future, no matter how distant, why haven't they come back to tell us? 2016-08-10T15:39:17.060
147 Would a bear cavalry be feasible? 2016-03-21T11:06:02.617
143 You can control a Demon by knowing its True Name, but why? 2016-04-20T13:58:32.073
119 Releasing a T-Rex into a modern ecosystem wouldn't be that bad, right? 2017-12-10T22:07:51.813
118 Could a planet made completely of water exist? 2014-12-04T20:28:41.187
116 Which major solar system body could most realistically be artificial? 2017-03-18T14:41:10.760
110 How far back in time would English be understandable to a modern speaker? 2016-08-08T13:31:25.797
108 Could a Dwarven Civilization Exist? 2015-02-09T21:54:53.180
99 How to monetize uploaded consciousness? 2018-04-23T09:18:13.387
98 Would relatively primitive people really confuse technology with magic? 2015-12-29T06:38:26.960
98 A believable place for your secret lair 2017-07-17T09:45:46.283
98 If 120 experts in 12 different fields were sent back 10,000 years, could they recreate the 21st century in 100 years? 2019-10-15T16:16:46.570
91 If the Romans found one working steam engine would they have been able to copy and use it? 2017-11-20T17:07:06.473
87 Lembas bread (2000 Calories per bite) 2016-09-21T16:35:14.897
87 Would a robot really need to use a heads up display (HUD)? 2018-06-05T11:48:30.553
85 Would a submarine make a great spaceship? 2015-08-27T16:59:52.713
83 Would a 'World Tree' be feasible in real life? 2016-07-25T12:33:36.453
81 Possible distance travelled by horse over 6 weeks? 2014-12-12T16:08:48.083
80 Humans can now run 40 mph. How do I keep the stupid people alive? 2016-03-22T18:59:18.413
79 How can I build a door to repel a horde of zombies? 2017-02-21T20:35:35.750
75 How can a pacifist country protect itself? 2015-10-14T08:06:31.733
75 Is there any real reason for Dwarves not to have cavalry? 2017-04-02T12:57:49.283
74 How does the government cover up alien crash landings? 2015-08-26T10:30:05.320
74 Can Average Joe reboot the nuclear power plant? 2015-11-01T12:10:49.817
74 Can Communism become a stable economic strategy? How? 2016-10-10T17:38:24.590
74 How Long Could an "Eternal" Fire Last? 2017-07-26T18:20:18.073
73 How could we fake a moon landing now? 2019-04-17T18:44:38.583
71 How do I make an alien technology feel alien? 2016-11-09T20:48:58.260
71 How could an ancient race warn the future in a universally understandable way? 2018-02-27T23:22:29.980
71 Anatomically correct "XKCDius lethalissimus" 2018-08-28T15:23:20.843
70 Would a culture with magic consider it magic? 2016-05-26T17:14:12.230
69 How to monetize magical mirrors in today's world? 2018-10-04T12:39:27.147
68 How do we tell if we're living in a virtual reality world? 2016-08-03T13:09:13.520
68 How could a language that uses a single word extremely often sustain itself? 2016-10-25T17:05:16.550
67 Why Would Aliens Enslave Humans? 2017-04-11T23:06:41.573
66 Are geographically typed planets realistic? 2014-09-16T19:39:14.647
66 How could I have modern computers without GUIs? 2016-12-05T19:58:36.547
66 How would people living in eternal day learn that stars exist? 2016-12-20T16:56:19.477
66 How much steel armor can you wear and still be able to swim? 2019-06-15T08:21:35.423
65 What would be left of a civilization founded in dinosaur times? 2015-03-22T16:05:22.977
65 Architecture of the perfect zombie apocalypse refuge 2015-10-20T18:34:33.927
64 Where can I transform without being noticed? 2016-12-15T15:28:58.223
63 I don't want to live on this planet anymore 2016-08-24T12:51:45.470
63 Making the 'Master Swordsman' fantasy realistic? 2018-08-21T11:25:33.593
62 Why would people bury their dead in tombs when they might become zombies? 2020-02-10T14:09:59.640
61 What would it take to build a ship capable of crossing the Pacific? 2015-09-08T18:38:55.970
61 Safe way to eat zombies? 2016-08-29T07:07:26.477
61 Why would two species of predator with the same prey cooperate? 2017-01-04T11:14:12.983
60 Stealth in Space: How realistic is it? 2015-08-25T02:54:41.003
60 Is Cancer Biologically Universal? 2016-06-28T18:21:08.283
60 Are there any rules or guidelines about designing a flag? 2016-10-11T18:01:09.863
60 Could extreme climate zones exist next to each other? 2017-06-06T13:22:43.780
60 Is it possible to create a practical sword that's naturally toxic? 2018-07-14T13:56:14.757
60 Why would a Dystopian government promote education to its citizens, instead of ignorance? 2018-08-05T02:35:53.037
59 A Bird that Never Touches Ground 2015-03-07T13:36:25.693
59 What are the conditions in which a creature would evolve more than one brain? 2015-04-20T19:39:35.527
59 Could an average person take over the world? 2015-08-25T16:32:54.470
59 What does Earth have to offer for an alien civilization 2016-07-21T02:12:03.930
59 How would an AI self awareness kill switch work? 2019-02-26T02:30:08.153
59 My perfect evil overlord plan... or is it? 2019-05-07T17:15:32.290
58 Killing off Indiana Jones 2015-10-29T13:37:37.893
58 Million-year-old records 2016-06-23T18:59:19.313
58 Why is this creature afraid of water but not of body or plant fluids? 2016-07-20T12:20:15.353
58 How can I prevent the collapse of the Soviet Union? 2016-09-23T17:19:49.020
58 How quickly will government realize that I am printing money? 2017-01-03T09:13:21.307
57 How would someone hide an asteroid in the void of space so only they could find it? 2016-06-23T15:47:30.223
57 Socialist country with good economy? 2016-12-13T13:42:33.747
57 An infinite train circling the planet that never stops 2017-03-13T16:52:52.607
57 Santa is broke. How much does it cost for someone else to be Santa? 2017-12-21T15:36:03.327
56 FTL travel is impossible. How is interstellar trade possible? 2015-05-14T13:14:15.987
56 Other blood colors 2015-10-24T20:24:46.967
56 How can there be different religions in a world where gods have been proven to exist? 2016-10-10T23:16:43.330
56 Is space piracy orbitally practical? 2016-11-30T18:44:53.720
56 Could a joke be funny enough to kill? 2017-05-30T18:13:46.770
55 Are gunswords feasible? 2016-08-29T20:25:28.770
55 An environment where round beds are easier to build than rectangular 2017-04-20T21:57:57.637
54 Is a man-eating plant realistic? 2014-10-02T12:20:57.803
54 Why would merfolk have hair? 2016-05-31T02:15:10.650
54 How would exposing a female warrior's (mostly) bare bottom help her in combat? 2016-09-07T20:47:29.377
54 What could make an area of land be accessible only at certain times of the year? 2016-10-17T03:27:25.740
54 The 10,000 year skyscraper 2016-10-31T23:47:57.520
53 Lifeform - resistant to gunfire but vulnerable to melee 2015-03-26T11:07:44.347
53 How to introduce my perpetual motion invention to the scientific community? 2016-07-03T20:50:59.167
53 Would a steam powered plane be able to cross the Atlantic ocean? 2017-10-04T13:21:18.630
52 Would charging unicorns survive the impact with a line of infantry? 2014-11-29T18:35:45.487
52 What could prevent a sentient species from going to space? 2016-06-21T07:14:04.617
52 How would one build a refrigerator to survive a nuke? 2016-09-15T15:20:20.373
52 Farming after the apocalypse: chickens or giant cockroaches? 2016-10-17T17:56:50.730
52 Are endothermic bombs possible? 2016-11-30T04:23:04.907
52 How to be hidden from world for a year 2016-12-12T09:05:39.597
51 How can I build a Nuclear Reactor in my backyard? 2017-04-05T03:38:25.593
51 How to completely destroy a city, without leaving clues for humanity 4,000 years later? 2018-04-04T09:28:56.917