Living In The Fourth Dimension

In today's news: Scientists say that time travel is impossible. Well, how about that. Brian Greene, author of the bestseller, “The Elegant Universe” and a physicist at Columbia University says that there are a goodly number of notions about how we might travel into the past, “and almost all of them, if you look at them closely, brush up right at the edge of physics as we understand it. Most of us think that almost all of them can be ruled out.”
Great. No Time Tunnel. No Terminator (1, 2, or 3). No Twelve Monkeys. Maybe it's only the titles that start with "T". Would "Somewhere in Time" be plausible, if not intensely sappy? What about that episode of Star Trek where Bones gets all whacked out and then Kirk and Spock have to go chasing after him through a time portal and Kirk ends up snogging with Joan Collins? Come to think of it, the only thing that makes snogging with Joan Collins plausible is time travel.
Okay, so brushing up to the edge of physics makes Mister Greene (sorry) Doctor Greene uncomfortable. I can accept that. As long as he can accept the fact that just ten years ago no one would have guessed that we would have parents able to carry on conversations on tiny mobile "phones" that allow them to ignore their children entirely as they squeal and race up and down the aisles of the supermarket. For that matter, who would have predicted the rise of the modern "supermarket" just fifty years ago? That one may not have been quite as big a stretch, but how about The Magic Bullet Blender?
Is there hope? If there is, then it lies in wormholes. To punch a hole into the fabric of space-time, Michio Kaku, author of “Hyperspace” and “Parallel Worlds” and a physicist at the City University of New York explained, would require the energy of a star or negative energy, an exotic entity with an energy of less than nothing. Right. Now we're heading in the right direction (dimensionally speaking). What does our good friend Doctor "Buzzkill" Greene say? “Many people who study the subject doubt that that approach has any chance of working, but the basic idea if you’re very, very optimistic is that if you fiddle with the wormhole openings, you can make it not only a shortcut from a point in space to another point in space, but a shortcut from one moment in time to another moment in time.”
Fair enough, I choose to be very, very, very optimistic. I for one believe in the manipulation of time - I own a Tivo.