The topic of this research paper is perhaps best introduced by an excerpt from the
document on which it is based. It seems to me that a few preliminary remarks and
disclaimers are in order.

In the course of my electronic archival investigations, I happened upon a
particularly interesting, if somewhat unbelievable, document. At this juncture, the
chronology of the supposed names and events is baffling to me. I do not purport to
understand the entire affair as of yet. I have enlisted the aid of my good friend,
Arthur Dobie. He has agreed to peruse the 64 pages of theoretical mathematics
which follow the cover letter of the supposed time machine test pilot, Crowley
Severenson. The excerpt follows:

It seems to me that this letter is unique in the annals of time-travel history.
Don't mistake my intentions, I am quite certain that time travel is a reality
and has been for many years. I am equally certain that because of many
factors, including fear of the unknown, time travel has remained a mystery
to the general public and valuable information has been lost. Those
advocating time travel in the past have been deemed weirdos, witches, and
lunatics. These are labels I hope to change. I hope to prove to the world
that time travel has been and will be possible for the common man as well
as the scientist.

There is much to learn from what has transpired in the past, both in the
world of time travel and history in general. Imagine how we could rewrite
the history books given actual personal experiences in the events recorded.
Travel to 1776 and the signing of the Constitution; what personal
vendettas were being proliferated that day? Whose political careers formed
and influenced the document that the United States government is based
on today, 250 years later? Why was Mozart's genius not better respected
and understood at the time of his death? Did Shakespeare actually write
all the works attributed to him, or are some of them written by other
authors? What really happened the day Rome burned, and what was Nero
doing at the time? Who is Jack the Ripper? Is Elvis alive? These are the
unanswered questions of history that we can and will uncover.

Of course, there are important concerns that we need to consider. What
about the very real possibility of altering history by a foreign force in a
different time. What about the old adage, "live and let live"? Certainly we
will discover things that are better left unknown and unexposed. How can
these things be regulated?

Many of these questions remain unanswered today, both regarding the history
involved and the implications of finding out the answers. Is time travel the best
thing for humankind? This research paper will not only investigate the question of
whether time travel is possible, but also whether it is advisable. Some would have
us ignore the progress to date in this area and forget about it altogether. And
perhaps they are right; "fools rush in where angels fear to tred," as they say. But if
we plan ahead, examine all the issues involved, and attempt to prevent some of the
potential disasters time travel might unearth, we can perhaps move into this new
era and dimension with the utmost ease.