If time travel to the past is possible, where are all the tourists from the future?
Time travel might be impossibleThe simplest explanation—no tourists because no one can actually go back in time. Physics (as we understand it) doesn’t give us a clean, realistic way to do it. They’re here… just not obviousIf future tourists existed, they’d know not to mess things up. They could be blending in perfectly—no flashy behavior, … Read more