The Time Traveler Test I propose the following as a test for any alleged time traveler to prove their claim. The layout: Four sets of four numbers will be posted by two different posters, two sets each. Then the same two, or if desired two new posters, will place the action symbols of +, -, x, / in place between the number sets, two by the first and one by the second. We then have a mathematic equation that can be solved for an answer. Here's the fun part. The process: Day 1 The time traveler claimant, having agreed to being tested, will post the "answer" to the equation that "will be posted over the next few days". Day 2 The first person posts their two sets of numbers. Day 3 The second person re-posts the original post and includes their two sets of numbers. Day 4 The first person, or a new third person, re-posts the previous post and includes the first two action symbols, of their choice, after any two number sets. Day 5 The second person, or a new fourth person, re-posts the previous post and includes either of the remaining action symbols in the remaining place. Re-posting each time prevents any altering of the previous posts. We now have an equation such as this; 1234 - 5678 x 9012 / 3456 = ? At this time the answer given on Day 1 can be compared to the answer available on Day 5 and we "know" if we have a time traveler (or the other possibility, one hell of a psychic) or not. The Reasoning: Using the numbers 0-9, taken 4 at a time, order is not important, repetition is allowed gives 715 possible combinations. These 715 combinations taken 4 at a time give 1.0798^10 number combinations. 10,798,000,000 Using any 3 out of 4 different actions on the number sets gives 24 permutations of the equation. That is approximately 259 Billion possible answers. Only a time traveler, who could go 5 days into the future, look at and solve the equation and return to day 1, would be able to post the correct answer. Or as stated previously, one hell of a psychic. If anyone were to pass this test I would, pretty much, believe anything else they told me. If, of course, the time traveler makes the point that there are approx 259 billion timelines where each of the answers could be correct so, how would they know they were in the right timeline, is using a BS cop out and they are full of BS.