Time travel

Black holes are commonly associated with time travel. While it is true that traveling through a black hole will take you through time, it will also crush you to the size of a pea. This, along with lack of the ability to live, tends to be inconvenient for the common time traveler.

Time travel is the act of traveling through time. Of all 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. Certain locations are known to disrupt this velocity curbing the flow of time itself, such as the grocery store checkout line or Department of Motor Vehicles office.

Recently, however, scientists have investigated purposeful movement forwards and backwards through time and how to control time's velocity. Contrary to popular belief, time travel can not be achieved by adjusting your wristwatch to the time you would like it to be; 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.

History

Historical reconstruction of the primitive time machine.

Pre-technological attempts

The earliest time machine was invented by cavemen, who discovered that by hurling a rock at rapid velocities toward another's head, the other person would be transported nearly an hour through time. This primitive time machine was soon replaced by better developments, such as running at full speed into a boulder, punching someone else in the face, and having near-death experiences. Unfortunately, these methods often had unwanted side-effects: the first two methods caused a kind of brain damage; the last involved one's life flashing before one's eyes, which was particularly boring if you were a rather hairy man that lived in caves all day.

Not-so-recent innovations

For those without comedic tastes, the so-called experts at Wikipedia think they have an article very remotely related to Time travel.

The first mechanical time machine was invented by an unnamed scientist who turned an outhouse into a time-traveling device in the 1900s. Unfortunately, he traveled back in time, distracted himself from his moment of inspiration in the loo, and the time machine he invented popped out of existence somewhat like a popcorn kernel.

A slightly more ambitious attempt at time travel occurred seventeen years later in England. Having established that time is the fourth dimension, and that current locomotive machines move through the third dimension of space, it was assumed that one could change a "space machine" into a time machine by simply rotating or pushing the vehicle until it was facing the fourth dimension. It was shortly demonstrated that this theory was actually complete codswallop, but not before several expensive automobiles had already been lifted onto their ends, crushed flat, reconstructed inside-out, or disassembled, melted down into iron nuggets, and buried in the very same mine from whence it came.^[1]

One of the more famous examples of time travel involved the production in 1976 of a brand of instant coffee which was so instant that it actually turned into coffee thirty seconds before one even poured the water. This created a rather large amount of anomalies in time travel, as people would assume their coffee was made through some sort of miracle, begin to drink it, and in forgetting to pour the water, the coffee would slurp right out of reality. Often, consumers would awaken the day after to find themselves trapped in a time loop, married to one of their parents, or in extreme cases, stuck in the non-existent day October 32nd, 2038.^[2] Fortunately, the makers of "Pre-Instant Coffee" soon rectified the situation with their "Stable Loop" blend. Whenever a customer drank Stable Loop without intending to pour the water afterward, a series of highly improbable accidents would occur within the next 30 seconds, resulting in the customer accidentally pouring boiling water into their mug anyway, no matter what they might have been wanting to do otherwise.

It was postulated by various science fiction writers in the 1980s that one could use wormholes to travel backwards or forwards in time. This idea, though scientifically plausible, was quickly laughed down, as nobody in their right mind would ever want to send a worm through time. Apart from fertiliser producers, that is.

Recent and soon-to-be-recent innovations

Today, most people do not yet own time machines. Time stretching, however, occurs naturally. A red light seems longer because one wants it to pass quickly, and, due to irony being the fundamental force of the Universe, it passes more slowly. This is particularly useful in life-and-death situations. When confronted by a terrorist, for example, simply focus on how depressing life really is, and time will slow enough to dodge their bombs, turbans, religious mumbo-jumbo, or whatever they might be tossing at you. As a consequence of this logic, depressed people have such quick reflexes that, despite their wishes (and the wishes of many others), they will never die.

Sadly, time tourists hardly visit the 21st century, primarily because nothing interesting happened in it. Cancer isn't due to be cured until the 23rd, and politics won't make any sense again until the 28th. Anyone hoping to hitchhike will have to wait at least a good century, by which point they'll probably be complaining about the future not being the past despite this being a logical improbability. If one does, however, find a time traveler kind enough to take them on a trip, it is highly advised for one to trade in one's watch for a turkey sub. It'll keep time just as accurately, but it's much easier to eat.

The first proper time machine was invented in the 22nd century, but it didn't sell at all well due to its hot pink color. It was years later that a new advertising campaign was instituted^[3] and time travel became popular. With all these civilians mucking about in the time line, a few rules had to be instated.

Etiquette

Yeah, funny. For the first million years, maybe.

The first year of time travel was a mess. People skipped over weeks just because they weren't interested in them; they dropped iPods in the 19th century just to see what would happen; and someone traveled to the beginning of Time and tried to convince God that cows would be a lot funnier if he made them with two heads.^[4] Thus A Time Traveler's Guide to Etiquette was written and put down a few basic rules.

It is commonly frowned upon to travel through time to witness a historical event. Imagine, if you will, being a major historical figure who has a hundred people show up just to watch him get shot in the back of the head.
For the record, yes, you can go back and become your own grandfather, but this gets awkward when going through the family photos years later.
If you time it just right, you can go back and meet yourself. But you're not that interesting to talk to in the first place.
Preventing yourself from being born is at worst paradoxical, at best horribly impolite.
Elvis is dead. You don't need to check.
It is considered rude to inform your best friend how he or she is to die. Nobody likes a spoiler.
And finally: if you accidentally step on a single butterfly while visiting the Jurassic era, you must immediately travel back a little further and step on the butterfly's grandfather. This will prevent the butterfly from ever existing, and thus from being stepped on by you.

Slowly, the amount of paradoxes decreased and time was put back in some sort of order.^[5] The only permanent change appeared to be the loss of a major historical figure, Saint Kyle, the patron saint of annoying lights.^[6]

Ethics

Religious people with nothing better to do argued that to play with the time line was to play God. Skeptics questioned why God had the right to play with time in the first place.^[7] Ethical questions about the lottery, presidential elections, and cheating at poker were brought up. It was ruled in a famous court case (Unheimer vs. Everything) that knowing information about the future was only cheating if you knew you were cheating. This resulted in a lot of time travelers driving drunk so that they would forget they were cheating, which resulted in a lot of temporal accidents and people popping up outside of their time periods. It was rumored that four major religions got started just by drunken time travelers popping up out of nowhere and exclaiming "Oh, God!" in what was perceived as a divine moment.

Sidewise in time

Besides being the name of a great short story about a teacher horny for a student, it is the concept of being able to time travel. Just not forwards or backwards. Sideways, into Alternate Universes.

These are realities where cliches live, like Hitler winning the war, the South winning the war, etc. Never, "what if William Henry Harrison had served his whole Presidential term?". Probably this is due to Americans being too dumb to learn history.

In any case, if you could go sideways, this would actually let you go forward or backward in time, in a way. You see, there'd be an Alternate Universe where the Big bang happened 200 years later then it did here, so if you went to that Alternate Universe, it would still be 1809 and you could see the log cabin that Abe Lincoln built so he'd have a place to be born.

Of course, in an infinity of Alternate Universes, we could have people coming here, as we are their alternate. (See:Sliders)

Travelling sidewise is very dangerous and should be avoided. But if you must do it, stay away from Alternate Universe 947 where George W. Bush had a third term and Jesus was given the electric chair.

References

↑ Interestingly, it is rumoured that at one point during this experiment a worker remarked "Sod this", threw down his tools, turned to walk away, and vanished into thin air — only to reappear in the exact same spot in 1937, nauseated and confused.
↑ This was the result of a previously undiscovered miscalculation in the construction of the Gregorian calendar system. People mostly ignored the 32nd, but it remains an awkward bump in the otherwise smooth passage of time, and time travelers often end up there when they've made a mistake.
↑ Instead of playing the "time travel is cool" angle, which didn't work well in the first place because many people were afraid of discovering that their mothers were hot all those years ago, they pushed the "cupholders" angle. With a bit of dimensional tweaking, a time machine could have an infinite amount of cupholders, a vast improvement on the standard flying vehicles of the day.
↑ And was smited.
↑ The future coming after the past was considered a good start.
↑ Such as traffic lights, brake lights, flashing neon lights, et cetera.
↑ And were smited.

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[1] Interestingly, it is rumoured that at one point during this experiment a worker remarked "Sod this", threw down his tools, turned to walk away, and vanished into thin air — only to reappear in the exact same spot in 1937, nauseated and confused.

[2] This was the result of a previously undiscovered miscalculation in the construction of the Gregorian calendar system. People mostly ignored the 32nd, but it remains an awkward bump in the otherwise smooth passage of time, and time travelers often end up there when they've made a mistake.

[3] Instead of playing the "time travel is cool" angle, which didn't work well in the first place because many people were afraid of discovering that their mothers were hot all those years ago, they pushed the "cupholders" angle. With a bit of dimensional tweaking, a time machine could have an infinite amount of cupholders, a vast improvement on the standard flying vehicles of the day.

[4] And was smited.

[5] The future coming after the past was considered a good start.

[6] Such as traffic lights, brake lights, flashing neon lights, et cetera.

[7] And were smited.

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Time travel

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