LYCOS RETRIEVER 
Time Travel: Traveling
built 294 days ago
Time Travel is an excellent date calculator for personal and professional use. Calculate the number of days, weeks, months, years between two dates. Go to a number of days, weeks, months and years ago or later from a date. Learn your age in year/month/day format, as well as the number of days, weeks, months, years from your birthday. Learn how many days you have worked, or your employees have worked by using skip day(s) feature.
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Time travel has been a staple of science fiction. With the advent of general relativity it has been entertained by serious physicists. But, especially in the philosophy literature, there have been arguments that time travel is inherently paradoxical. The most famous paradox is the grandfather paradox: you travel back in time and kill your grandfather, thereby preventing your own existence. To avoid inconsistency some circumstance will have to occur which makes you fail in this attempt to kill your grandfather. Doesn't this require some implausible constraint on otherwise unrelated circumstances?
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Time travel is the act of traveling through time. Of all the living organisms on Earth, only humans are known to be gifted with abilities of time travel, always moving forward at approximately one minute per minute (unless they're at the checkout line at the grocer's). Recently... scientists have been looking into controlling this velocity of time. Why human beings have the overwhelming desire to replay some of their most embarrassing moments or make more embarrassing moments happen more quickly is a mystery to many, much like the invention of the video camera.
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This year, Time magazine, having sat on the sidelines for years, watching Newsweek get all the laughs, joined the year-end frolic, offering its pick of the year’s editoons in one of its several online “top ten” features. This selection, which can be viewed here, is even more disastrously trivial and inconsequential than Newsweek’s crop. The cartoonists — R.J. Matson, Daryl Cagle, and Mike Peters (with two each), plus John Sherffius, Bob Englehart, Gary Clement (Canadian), and Mike Thompson — all do superior work — not a slouch among them — but Time has selected from their year’s endeavors cartoons that focus on topics that are of very little consequence. Englehart’s cartoon, for example, is about senior sex: in the first of two panels, a reporter asks an elderly couple what they think of a survey that shows senior citizens are having sex two or three times a month; in the second panel, the old guy says, “That’s all?” This is one of the Top Ten editoons of the year? Anyone even vaguely aware of the mechanisms of comedy realizes this “joke” employs one of the oldest dodges in the business; its very antiquity ought to disqualify it as a candidate for the Top Ten Editorial Cartoons.
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Time travel has recently been discussed quite extensively in the context of general relativity. Time travel can occur in general relativistic models in which one has closed time-like curves (CTC's). A time like curve is simply a space-time trajectory such that the speed of light is never equalled or exceeded along this trajectory. Time-like curves ... represent the possible trajectories of ordinary objects. If there were time-like curves which were closed (formed a loop), then travelling along such a curve one would never exceed the speed of light, and yet after a certain amount of (proper) time one would return to a point in space-time that one previously visited. Or, by staying close to such a CTC, one could come arbitrarily close to a point in space-time that one previously visited.
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Cosmic strings are either infinite or they’re in loops, with no ends, said J. Richard Gott, author of “Time Travel in Einstein's Universe” and an astrophysicist at Princeton University. “So they are either like spaghetti or SpaghettiO’s.”
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