Time travelers, if they exist amongst us, have yet to betray their period-hopping ways online, according to a fun, new study aimed at finding visitors from another time, based on their digital footprints. Theoretically, the idea of time travel forward in time should be possible according to Einstein's General Theory of Relativity. In fact, scientists have already sent teensy particles called muons forward in time. But sending a large object, such as an entire person, into the future remains in the echelons of science fiction, for now. Even so, over a summer poker game, Robert Nemiroff, an astrophysicist at Michigan...