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An article from DiscoverMagazine online. Heavy stuffs there but interesting read.

The possibility that time may not exist is known among physicists as the problem of time. It may be the biggest, but it is far from the only temporal conundrum. Vying for second place is this strange fact: The laws of physics dont explain why time always points to the future. All the lawswhether Newtons, Einsteins, or the quirky quantum ruleswould work equally well if time ran backward. As far as we can tell, though, time is a one-way process; it never reverses, even though no laws restrict it.
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