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

177 What is the least "world changing" reason why the government would pay for you to keep a llama during your 44th year of life? 2017-09-16T15:49:10.587

140 What single change would have given the best chance for the Axis to win World War 2? 2015-12-02T15:58:09.963

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

86 What could an average modern human achieve in medieval times? 2015-03-26T11:59:02.220

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

59 What would be the impact of a modern programmer and laptop being dropped into World War II, possibly breaking Enigma? 2015-03-17T16:22:47.577

58 How can I prevent the collapse of the Soviet Union? 2016-09-23T17:19:49.020

54 Crucial and unlikely discoveries in history 2017-02-19T13:58:32.730

53 Would a steam powered plane be able to cross the Atlantic ocean? 2017-10-04T13:21:18.630

50 Stumped: What would replace 'names' in an alternate history? 2017-04-11T15:41:32.883

47 Is this alternate history plausible? (Hard Sci-Fi, Realistic History) 2016-10-21T02:42:17.093

43 Is it possible to create a Gas Mask using only Medieval Technology? 2018-07-17T04:52:34.967

43 Can the Aztec Empire learn and reuse Conquistador technology? 2018-11-18T20:37:58.680

42 What would World War I outcomes be if the Tunguska event had occurred over London in 1908? 2014-10-15T09:55:01.910

41 What steps are necessary to read a Modern SSD in Medieval Europe? 2019-03-30T18:50:31.370

40 What single change would have given the best chance for the Soviets to win the Cold War? 2015-12-08T18:12:10.373

39 What difficulty would the Roman Empire have besieging a fantasy kingdom's 49 m wall? 2016-11-15T15:05:37.640

36 How would the indigenous peoples of North America have developed in the absense of the Europeans? 2018-02-12T01:41:43.123

34 What could cause humanity to migrate from land to water? 2016-11-14T10:33:28.967

34 What is the most reasonable way for non-binary computers to have become standard? 2018-11-26T13:22:11.533

33 Would the capability for Japan to drop a nuclear bomb on the USA have deterred the USA from dropping a nuclear bomb on Japan? 2017-05-19T20:04:32.017

33 Could the Romans have colonised the New World? 2017-09-17T17:52:29.043

31 What would need to happen to history to make a 21st century steampunk world? 2014-11-07T04:55:33.727

31 What would modern IT look like if Silicon Valley had been completely destroyed in 1985? 2016-02-08T05:12:08.120

31 In the late 1940’s to early 1950’s what technology was available that could melt a LOT of ice? 2019-03-10T17:31:17.883

30 Would evolution happen the same exact way if Earth restarted? 2018-06-20T06:30:58.447

29 How long would it take to remove all trace of a civilisation, with malice and intent? 2014-11-24T13:54:35.670

29 How could the Mafia retain its power in New York into the new century? 2018-09-07T00:29:22.230

28 Would the US government of the 1960’s be able to feasibly recreate a modern laptop? 2019-10-28T22:19:24.543

27 Would the members of an online imageboard (or any community) be able to build a post-apocalytic society upon their reputation? 2016-11-10T20:54:50.003

27 Could the Industrial Revolution be delayed indefinitely? Or is it inevitable once a certain point in development is reached? 2016-11-16T09:37:57.390

27 If the Cold War went hot in the early 1970s, would the Warsaw Pact be able to reach the Rhine River? 2017-04-03T17:37:40.927

27 Spaceflight without transistors and nuclear power - how to bend the history of physics? 2017-11-12T12:59:19.180

26 Zombie perpetual motion machines 2015-03-24T17:38:14.523

26 How could a simple submarine be built using 100 BC technology? 2015-06-18T16:40:56.767

26 World where gender roles are swapped 2015-08-06T07:09:00.237

25 If North America Was Devastated in 1980, Would the Eastern Bloc Still Collapse in 1989? 2016-11-27T18:20:07.370

25 Why can't a Tercio use crossbows and pikes? 2018-01-29T14:23:33.493

25 Would common people in central Europe in the 15th century notice that the whole Asia disappeared? 2020-01-30T18:17:51.943

24 Could a time traveler prevent the Black Plague? 2016-06-07T18:08:36.320

24 Is it bad Worldbuilding to use the real world and history as a template for your own setting? 2018-01-21T21:00:36.697

24 How much alteration would be needed for the Cuban Missile Crisis to go nuclear? 2018-10-20T23:11:32.993

24 Would an enduring Inca Empire ever need paper? 2020-01-31T11:54:00.030

23 What advice could a time traveller give for use of an atomic bomb to end WW2 while minimizing loss of life or later nuclear brinkmanship 2015-12-22T19:42:36.437

23 If clock and calendar was reinvented with today's knowledge, what could they look like? 2016-04-01T00:16:12.477

23 What would have happened to the world if the sepoy mutiny of 1857 had suceeded? 2016-10-30T16:26:17.043

23 Could medieval atheist king end religious dominance? 2017-04-13T08:19:31.050

23 Super metal and the construction of knight armor 2017-05-23T17:58:31.433

22 What would North America look like if the States weren't United? 2016-01-28T07:29:43.487

22 Lost in the multiverse: how to find home? 2016-06-23T19:56:28.637

22 How advanced can a civilization get without zero? 2018-07-06T02:12:15.163

21 Are there any good alternates to iron? 2017-10-27T17:55:58.957

21 Finding real world historic examples of cultures/organizations/tribes to represent Orcs 2018-10-15T18:47:36.427

21 First innovation for time traveler to low-tech society 2019-01-16T23:33:14.747

20 Medieval Europe With Modern Logistical Industrial Concepts 2016-10-03T17:54:10.040

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

20 If Michigan had never become the center of the auto industry, what would it be known for? 2017-12-07T15:42:01.043

20 An Undercover Army 2019-03-07T04:13:54.990

20 Aliens englobed the Solar System: will we notice? 2019-03-12T02:12:41.263

19 What services could a time traveller offer a medieval king? 2015-12-08T23:47:11.293

19 Could The Spartan Discipline Work on Larger Nations? 2017-01-09T04:52:39.063

19 How could a time traveller change medieval history using only modern knowledge? 2017-02-21T08:06:51.273

19 What is the oldest a cave could possibly be? 2017-03-21T16:24:55.760

19 Combat in age of swords and railguns 2017-08-17T11:01:14.900

19 AIDS vs Great Plague in medieval period 2018-07-20T09:07:23.837

18 What would Earth be like right now without the Black Death? 2014-10-22T09:50:11.947

18 How viable are my glass towers with (Arab-Islamic) Renaissance technology/engineering? 2016-05-17T17:51:09.317

18 Can I have Gunpowder without having guns? 2016-09-08T19:25:17.447

18 Technology level of South African Vikings in 1488? 2016-10-29T15:18:55.303

18 How to make the era of airships last longer? 2017-04-30T11:51:28.760

18 How well would precision guided munitions work against early aircraft? 2018-01-03T16:07:53.873

18 Ancient Light Trigger Mechanism 2018-04-09T21:37:07.237

18 Reality check: Buddhist Aztecs 2018-06-05T00:55:54.973

17 How could 1BC Earth speed up communication across vast distances? 2015-12-19T03:02:18.183

17 How can I achieve swords in modern military 2016-08-25T22:48:21.913

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

17 19th Century army standing against a Modern Army 2017-06-23T02:16:00.497

17 Can a world exist with large calibre guns but without small calibre guns? 2017-10-21T13:10:46.057

17 How to split South Africa on racial lines? 2018-03-18T19:57:18.080

16 Killing all the explorers 2014-12-17T07:33:05.787

16 Could Inuits survive in Antarctica? 2016-08-23T08:16:35.463

16 What would the Soviet Union have looked like if Trotsky was in power, not Stalin? 2016-10-06T16:34:06.737

16 Why would we burn witches? 2018-10-22T22:44:23.997

16 What would sway all humans to stop having kids cheerfully, painlessly, voluntarily? 2019-10-16T02:34:12.293

15 Cultural reasons to prevent the industrial revolution 2015-11-09T21:01:04.827

15 Modern military tactics and strategy effects on the past (WWII) 2016-08-03T18:55:05.960

15 Could the IJA have mounted an invasion through Alaska in this alternate timeline? 2018-02-15T20:06:34.823

15 Could Catholicism have survived as the dominant religion in England if it had allowed aristocratic polygamy? 2018-05-30T19:43:57.167

15 A Permanent Norse Presence in America 2019-03-24T03:34:08.660

15 How could the Empire of Japan and America be allies in WWII? 2019-12-02T21:02:53.380

14 How would the history of American colonization by Europeans differ, if the Native Americans were immune to the new diseases? 2015-11-29T00:08:51.363

14 How would a lack of smokeless propellant affect WW1? 2016-09-06T19:29:49.727

14 What is the most befitting place to drop 'H'itler bomb to score decisive victory in 1945? 2016-10-07T00:33:54.713

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

14 King John acting boldly and opening churches - would this work? 2017-04-27T01:39:01.250

14 Julius Caesar with a one-time pad 2018-03-20T03:39:43.453

14 Is it possible for a wooden medieval era ship to carry a ballista inside that fires from the ship s prow? 2018-04-22T14:17:44.360

14 How might a Professor of Mathematics Change History? 2018-07-30T10:19:21.570