if( aicp_can_see_ads() ) { $adCode = '
'; return $adCode; } else { return '
'; }

10 Mind-Bending Theories About Time Travel

Bill and Ted, Marty McFly, those guys in the hot tub; time travel seems to belong in the world of fiction, but here are some ideas that might make it a reality in 10 mind-bending theories about time travel.