The stuff that time travelers leave behind. It happens more than the lay-citizen of history might guess — time travelers drop things (litter on the timeline is forever). Our collection of “found” time travel items includes misplaced time travel guides. Some believe these guidebooks were planted to actually seed time travel. Time travel experts have scoured these books for authenticity which is hard to confirm since the timeline’s baseline is always in flux. Confirmation or not, there is a growing collection of field guides to time travel.