286 How do you prove you're from the future? 2015-03-20T11:41:54.583

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

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

122 What cheap modern items can I use to bribe medieval people? 2017-03-23T14:12:45.780

110 How far back in time would English be understandable to a modern speaker? 2016-08-08T13:31:25.797

100 If I went back in time, how could I handle being among the Black Death and survive? 2016-03-15T05:55:47.340

98 Would relatively primitive people really confuse technology with magic? 2015-12-29T06:38:26.960

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

88 My time machine needs to know when it is 2018-06-26T21:26:45.733

76 I'm on the Titanic, what should I do to survive? 2019-10-15T01:30:25.757

73 How would people in 17th century Salem react to modern day clothing 2018-02-19T04:58:02.050

66 What modern technology would be most revolutionary to ancient Greeks? 2016-07-19T01:08:58.003

63 I travel back in time: how could I know when I landed? 2018-08-03T08:26:20.323

61 How to find out a year I'm in? 2016-11-27T17:29:03.190

61 Modern warfare theory in a medieval setting 2019-10-01T10:12:10.843

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

59 Prehistoric messages to the future 2017-05-04T10:12:08.893

53 Are there any ways to allow some form of FTL travel without allowing time travel? 2016-07-11T00:28:25.177

52 Plausible reason why my time machine can only go back a certain amount of time? 2018-07-30T03:29:39.890

51 How would you bring wealth back to the past? 2018-06-03T23:00:51.030

49 A small group recreating modern technology 2014-12-18T22:12:00.200

49 Stopping time, by speeding it up inside a bubble 2016-10-09T17:37:38.193

48 Could medieval people produce automatic firearms if they had access to the schematics? 2015-02-21T08:56:27.733

48 How could we time travel backwards without killing everyone with germs from the future? 2016-08-09T09:14:57.950

44 How Could A Time Traveller Communicate With Neanderthals? 2015-08-12T11:19:56.517

44 Suitable jobs in Ancient Rome for time travelers 2017-04-28T04:36:34.573

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

43 How much could a time traveler earn from selling 2016 tech having traveled back to 2000? 2016-09-30T07:35:30.897

43 How does a time traveler prove he or she is from the near past? 2018-07-06T19:39:05.997

43 How could a time traveler have prevented climate change 2019-02-10T15:20:14.863

41 Would time travelling to the present be lethal to a person from the 1200s? 2018-01-26T21:27:45.677

41 Why buy tech from the future? 2018-06-07T04:20:06.287

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

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 Keeping supplies for 1000 years 2016-09-04T08:59:51.687

38 How can I explain that a time travelling apparatus moves itself through time but appears in the same location? 2015-03-23T12:16:40.557

36 Time-traveling Combat 2015-04-29T02:33:17.187

35 How far can a time traveller go into the past before his electrical equipment becomes unchargeable? 2014-12-20T17:19:32.213

33 Could a modern times time traveler produce an antibiotic in medieval times? 2015-03-31T06:55:26.107

33 Time travel coordinates 2015-07-22T11:30:14.740

33 Everything Joe says is true. How can he most help humanity? 2015-12-21T10:01:02.373

33 Can time travel make us rich through trading, and is this a problem? 2017-01-06T14:34:11.613

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 far back in time can I go before people stop accepting my money from the future? 2017-01-03T22:11:04.297

31 With future knowledge, can I prevent the Columbian Exchange epidemics? 2018-08-03T06:02:11.567

31 At what point in European history could a government build a printing press given a basic description? 2019-05-24T20:33:37.043

31 If I travelled back in time to invest in X company to make a fortune, roughly what is the probability that it would fail? 2019-09-25T00:49:03.713

30 How do I manage memetic infection while time traveling? 2017-11-28T17:46:52.650

30 How to identify or authorize members of a time travel organisation? 2018-09-08T16:05:51.247

30 What does it actually mean to have two time dimensions? 2019-07-16T23:21:07.170

30 How much tech advancement could be made out of modern processor appearing in 1980s? 2019-12-05T22:40:40.257

29 Is one year a realistic timescale to learn an ancient language if every language you knew didn't exist yet? 2015-10-26T13:52:25.303

29 How far back in time would Maths be understandable to a modern mathematician? 2016-08-10T10:14:03.823

29 How to test a time machine? 2017-01-09T22:32:21.683

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

29 Can a world where everyone has a time machine be consistent? 2020-02-17T14:11:41.987

26 Temporal Ethics for bidirectional time-travel with branching time-lines 2016-01-13T14:34:37.283

26 Can a single time travelling person prevent the World Trade Center attacks? 2016-09-17T08:34:06.717

26 A solution for the time-travel paradox - What could go wrong? 2019-01-17T19:17:06.690

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

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

22 How to hide from the world that you are a "Groundhogger"? 2015-12-30T21:05:56.187

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

21 Determining your universe's Time Travel Paradigm 2015-07-10T21:52:59.553

21 What change in history would I have to make to stop Christmas from happening? 2016-12-20T17:03:29.643

21 How to not get caught milking the stock market with a time machine 2017-06-02T21:27:49.760

21 How could an inter-temporal banking system work? 2018-06-05T17:57:53.190

21 What's the ideal era for harvesting resources by an advanced society? 2018-10-26T02:04:32.020

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

20 Would a person from the past be able to survive for a week in New York? 2016-03-18T19:48:10.973

20 Avoiding preventing your own birth in a time travel paradox? 2016-09-27T07:16:28.410

20 How to figure out someone is plagiarizing the future? 2017-06-07T22:20:40.677

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

19 How do you prevent causal loops from happening with the Novikov self-consistency principle? 2016-12-09T00:16:26.767

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

18 How do I manage disease risk while time traveling? 2015-08-09T05:53:45.637

18 Would a very successful groundhogger day trader be in trouble? 2016-05-23T15:56:51.457

18 Which modern firearm should a time traveler bring to be easily reproducible for a historic civilization? 2019-07-18T14:58:58.603

18 My time machine can go back farther than yours -- why? 2019-11-28T05:09:41.823

17 When could a microscope first be made? 2015-03-17T12:58:55.877

17 Time travel, assassination, and stunting technological growth 2016-07-20T21:16:31.927

17 A power source that would last a REALLY long time 2016-10-10T00:36:20.607

17 In a world with time travel, could one change the present by changing the future? 2016-11-08T19:16:55.853

17 How long could an operational Virginia-class sub survive in the Jurassic sea? 2017-01-01T08:51:25.877

17 If a person does not age can their hair and nails still grow? 2017-06-12T06:54:00.410

17 How to tell someone they have travelled in time, by gesturing? 2017-09-29T11:48:26.613

17 Designing a time thief proof safe 2019-09-20T12:08:13.553

16 The Tricky Trouble with Two Time Travelers 2015-04-18T05:04:16.183

15 How does TimeTraveler in WW2 set terms without having his technology taken instead? 2015-03-18T16:25:10.157

15 A society displaced in time 2015-06-15T19:40:42.537

15 Medieval low-energy houses 2015-10-14T19:55:40.803

15 If time-travellers always arrive naked how and what would they trade? 2015-10-16T00:18:17.873

15 Can a modern book that traveled back in time be proven to be older? 2017-08-16T15:59:38.157

14 How to make the most wealth out of a single "Groundhogday Potion"? 2015-12-23T16:21:50.207

14 Bringing potatoes to the middle ages 2016-01-02T15:42:46.860

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

14 How does a teleporter logically lead to time travel? 2017-03-24T16:31:20.710

14 Grammatical tenses for time travelers 2017-03-28T00:57:35.037

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