My grandfather was a time traveler. That's why I know that time slips are real. I don't believe in planned time travel, but accidentally wandering into some kind of time slip — that can absolutely happen. That's exactly what happened to my grandfather and his friend. They were both 19, heading to a neighboring town somewhere out in rural Missouri. They didn't notice anything unusual on the way — the only thing they could remember afterward was that it was foggy. No lightning, no thunder, no pressure in their ears. Just regular fog. When they reached the town, they were surprised they couldn't find the general store they were looking for, and a lot of other things looked different too. Then they thought someone was messing with them when they were told it was 1957. They swore they'd been in 1929 just minutes before. When they went back home, there was no record of the friend whatsoever. My grandfather had been listed as missing. It was a good thing there were two of them. At least they knew two people don't go crazy in the exact same way at the exact same time. They said they weren't upset. Both were orphans, so there was nobody who'd miss them — they just took it as some kind of miracle. After that, they went on to live good lives. Both got married, had kids. They stayed friends their whole lives. The only thing was — they never went out in the fog again. My grandfather used to say, "What if it happens again and I end up somewhere else? I already have a family now. I don't want to go anywhere anymore."