Hard to say if Doc Brown would give this his coveted seal of approval, but our gullible minds have already been made up: time travel is not only possible, but it's well within reach. A gaggle of scientists have apparently figured out a theory that could use the Large Hadron Collider to move a Higgs singlet back and forth through time. The 'catch' is that they have yet to prove the existence of said singlet, but the upside is that nothing in theory violates any laws of physics or experimental constraints. In other words, this wouldn't enable a human to move back and forth along the universal timetable à la Fringe, but it could allow for messages to be sent forward and back. About 14 other improbable things have to happen before this could even be tested, but if you're even remotely interested in the concept (c'mon, you are), you owe it to yourself to give those source links a peek.