Via Boing Boing, a physics professor and a graduate student have embarked to scour the Internet in such of evidence for visits from time-travelers.
I wonder if there might be some similar paradox at work that makes those living in the present somehow blind to things anachronistic—or to view them as a genre, like retro, steam-punk or Gothic, or that time-travelers from the future have returned to the past but to a parallel reality that we cannot experience directly, only as said trends from an alternate dimension. Widely publicized time-traveler conventions have been held by academic institutions since the 1980s but have apparently failed to attract any genuine venturers. There is also the possibility that stealth and caution have made such journeys impossible to detect—at least through tried means, and maybe time-travelers only need the projects and papers of a professor and his companion like this to tip them off and allow them to cover their tracks.