io9 proudly proclaims that they "come from the future." While we question the veracity of that tagline, their science reporting is beyond questioning. io9 is a veritable gold mine of all things science-y and nerdy. Annalee Newitz, Robert T. Gonzalez, George Dvorsky, and the rest of the gang never fail to simultaneously amaze and explain. This is a site that we check on a near-daily basis.
So, maybe they aren't time travelers... but instead mind readers.