178 How could dragons be explained without magic? 2014-09-19T07:09:36.137
173 Russian Dolls - How do they reproduce? 2019-01-31T10:23:20.467
140 What single change would have given the best chance for the Axis to win World War 2? 2015-12-02T15:58:09.963
135 Everything alive in the world dies this instant. Without bacteria to decompose anything, what happens to the remains? What does this look like? 2018-04-19T10:59:48.727
129 What could people notice about someone who is two times as dense as a regular person? 2018-06-09T20:44:39.247
128 How would I know if I were a 1 mm tall robot? 2016-04-25T09:07:42.517
123 Why would giant mechs use melee weapons? 2016-08-21T11:39:42.187
122 How can I ensure my Evil Tower is always stormy? 2018-09-24T17:50:30.710
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
108 Could a Dwarven Civilization Exist? 2015-02-09T21:54:53.180
106 What would make scientists realize they were on a flat world? 2016-05-27T13:02:38.770
105 How fast can I flood the Netherlands entirely and permanently? 2018-06-18T19:04:54.990
104 This sword is forged from meteorite iron - but how is that any good? 2018-01-23T15:13:20.380
101 If our universe was a simulation, what could a bug look like? 2014-10-26T13:32:11.063
101 How to build a trap to last the ages? 2018-04-09T22:25:49.560
100 Would intelligent life evolve any other body plan than humanoid? 2015-09-07T08:07:31.927
96 Would a Moon made of water pose a threat to Earth during eclipses? 2018-11-25T16:59:52.413
91 Why would vampires be incapable of entering a non-vampire human’s house uninvited? 2016-04-12T06:41:56.210
91 A poison that only works if you know it is there 2017-06-13T12:33:56.533
89 Are there logical gaps in the periodic table in which you could insert a new mystery element for use as a fuel? 2016-02-29T19:42:39.907
88 A mosque on Mars? 2018-06-13T18:59:29.313
87 Is there a scientific explanation as to why aliens should look similar to us? 2014-09-28T13:46:22.090
87 Lembas bread (2000 Calories per bite) 2016-09-21T16:35:14.897
82 Conquering a Metropolis with near-zero own casualties 2016-08-01T14:27:30.290
82 Is it worth sending a manned mission to a black hole? 2016-11-29T00:06:53.003
80 Humans can now run 40 mph. How do I keep the stupid people alive? 2016-03-22T18:59:18.413
79 How to protect shops in the medieval era against thievery? 2016-09-14T12:54:49.967
79 Could astronauts find their bearings in the Universe after being transported 6 gigalightyears from Earth? 2017-12-03T21:11:48.977
78 Tree Shape on a Tidally Locked World 2020-01-05T17:48:57.243
77 Spiders In Space: How to design a space suit for an arachnid? 2018-11-19T17:47:27.027
72 How to harness Jupiter's gravitational energy? 2016-11-02T14:58:14.213
71 Is it physically possible for a planet to have seasons of different lengths? 2014-09-17T14:58:11.893
71 How many people can you feed per square-kilometer of farmland? 2015-02-03T11:33:15.927
71 How can I move a planet? 2016-06-20T19:15:43.183
71 How do I make an alien technology feel alien? 2016-11-09T20:48:58.260
71 How could a natural road form across a sea? 2018-01-10T20:39:45.790
71 How can powerful telekinesis avoid violating Newton's 3rd Law? 2019-06-08T20:47:50.223
70 How can an unimaginably huge life form reliably communicate with mortals? 2017-03-27T20:08:46.637
68 Mineral that explodes when cooling down 2017-05-02T18:34:21.293
68 Would earthlike planets in other solar systems have well-known Earth gemstones such as rubies, emeralds and sapphires? 2018-04-02T13:19:17.293
68 What (modern) weapons could be used to destroy skeletal enemies as completely as possible? 2019-01-09T10:03:28.147
67 Let's weaponize jellyfish 2015-06-02T17:27:53.083
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
66 The opposite to Worldbuilding: World Destruction 2014-11-27T10:03:26.680
66 What single change would have given the best chance for the Allies to win the Battle of France in early WWII 2018-02-01T17:55:48.313
65 Can you simply scale up animals? 2014-09-19T07:52:17.147
64 How can I hide my island? 2017-04-19T22:26:28.360
64 Mosquito Armageddon 2018-06-11T13:04:21.740
63 What is the minimum radius of a circular corridor for the walls to appear straight? 2017-04-06T07:24:50.847
62 A 40km diameter alien saucer is floating 2km above the ocean for a long time. What are the effects on the sea ecosytem below? 2017-12-12T15:49:36.827
61 A city to last ten million years: Construction 2015-03-19T12:11:27.860
61 How to find out a year I'm in? 2016-11-27T17:29:03.190
61 What realistic way could limit an FTL drive to only travelling between stars? 2017-06-03T10:01:12.690
60 How would humanity enter a Dark Age? 2015-01-27T04:52:56.573
60 How does the Booze-Rat fuel its defensive mechanism? 2016-09-27T07:46:17.840
60 Could extreme climate zones exist next to each other? 2017-06-06T13:22:43.780
60 The land grows evil and corrupted ... but why? 2018-01-31T05:19:27.677
60 Is there such thing as a "one-person" door? 2018-10-01T23:38:45.243
59 What is the least expensive way to annihilate humanity? 2015-04-08T21:46:36.717
59 Why can't spaceships go underwater? 2018-03-05T21:19:35.070
59 How do I make a space battle both realistic, with physics in play such as no sound and weird motion, but also very epic and intense still? 2018-09-26T19:56:10.950
59 If reality were frame-rate based, how could we detect it? 2018-10-15T14:51:40.573
58 Could a human engineer comprehend alien electronics? 2015-06-17T17:05:33.883
58 How does Santa fit down the chimney? 2017-12-25T09:20:40.180
58 If every star in the universe except the Sun were destroyed, would we die? 2019-09-05T19:19:04.627
57 Is there a way to create a bomb to destroy a star? 2016-02-16T22:43:29.070
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 An infinite train circling the planet that never stops 2017-03-13T16:52:52.607
56 Creating a realistic world map - Currents, Precipitation and Climate 2014-10-09T12:19:33.643
56 Other blood colors 2015-10-24T20:24:46.967
56 How do you power all the nanobots? 2016-02-15T13:11:00.660
56 How far away would an alien civilization need to be for us to not notice them? 2016-04-06T17:51:16.730
55 What are the disadvantages of a long living race? 2016-08-28T07:52:26.927
55 Why do people in Cryogenic sleep not wear clothes? 2016-09-12T11:48:22.343
54 Is a man-eating plant realistic? 2014-10-02T12:20:57.803
54 Would a castle built at the top of a mesa have unusual weaknesses? 2017-08-17T13:19:58.723
54 What could cause sugary rain? 2017-12-15T22:04:01.047
54 How can Dwarves produce honey underground? 2018-01-05T19:42:10.667
53 Lifeform - resistant to gunfire but vulnerable to melee 2015-03-26T11:07:44.347
53 Are there any ways to allow some form of FTL travel without allowing time travel? 2016-07-11T00:28:25.177
53 Would a steam powered plane be able to cross the Atlantic ocean? 2017-10-04T13:21:18.630
53 Does my shipboard computer slow down as I approach light speed? 2018-03-08T23:32:28.497
53 Quenching swords in dragon blood; why? 2019-03-01T01:45:03.660
52 Creating a realistic world map - Landmass formation 2014-09-29T10:32:50.860
52 Can you shoot someone with a bullet... from orbit? 2015-07-24T17:57:38.473
52 Creating a realistic world map - Coastlines 2015-07-27T17:30:55.387
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 Military Tank drone, why are they not common yet? 2016-11-28T07:10:55.420
52 Are endothermic bombs possible? 2016-11-30T04:23:04.907
52 What possible scientific reasons could there be for a vampire to only be killable via wooden stake to the heart? 2017-08-25T08:35:01.403
52 Is it possible to have a planetary system with planets having perfectly synchronized orbits? 2017-11-16T16:22:55.357
51 Implications of Newtonian universe 2016-03-24T10:04:34.723
51 What kind of recurring phenomena could cast darkness on a planet for days/weeks at a time? 2017-03-03T04:14:11.617
51 How can I build a Nuclear Reactor in my backyard? 2017-04-05T03:38:25.593
51 What natural phenomena could make an island unreachable? 2017-06-11T10:19:39.157
50 What would a planet spinning fast enough to allow geostationary orbit near the surface look like? 2014-09-20T06:02:14.997
50 Explaining where energy comes from to power magic 2014-09-30T14:57:07.297