Time travel has been a popular science-fiction theme since H. G. Wells wrote his celebrated novel The Time Machine in 1895. But can it really be done? Is it possible to build a machine that would ...

According to Stephen Hawking, building a time machine isn't hard: "All you need is a wormhole, the Large Hadron Collider or a rocket that goes really, ...

Understanding Time Machine Mac OS X has had a built-in backup utility called Time Machine that is intended to be as easy to use as possible.

Let's indulge in a little science fiction for a moment. Time travel movies often feature a vast, energy-hungry machine. The machine creates a path through the fourth dimension, a tunnel through time.

Ready to start backing up your Mac? You don't need anything but an external hard drive and OS X's built-in Time Machine.