Every now and then, my brain turns out a what-if situation that just begs for a little pursuit. This happened today.
So, if you're looking for some theoretical fun to think about, read on! If you're looking for one of my regular real-life-update Journals... well, sorry to disappoint, but I'm having fun here.
So, without further ado, here's my new, possibly occasional feature:
Curious Question For Today:Ignoring Hollywood-style artistic license, the creation of quantum realities, and overall improbability,
would time travel into the past actually allow you to change the future? I would say yes, but you probably wouldn't like the change, in most cases. In fact, unless extreme precaution is taken, (and I mean way more than just trying not to touch anything. I'm looking at
you, Ray Bradburry.
) I would argue that time travel, if it ever became a reality, ought to be banned altogether. The reason, somewhat surprisingly, is biological.
As long as the human race has been around (perhaps minus the first few days/ however long the first two of us stayed in Eden) there have been microorganisms that are very fond of living inside us. Some, like the bacteria that normally inhabit our stomachs, live symbiotically with us, helping us with digestion and other processes our bodies have learned to lean on them for. Others live in us as harmless parasites. People can carry innocuous strains of normally harmful microbes around with no ill effects- usually without knowing it. We sure know it when we pick up some of these microscopic parasites that
do cause us harm, though. Sickness is nothing new to us. But it can be.
Consider the dark days Europe went through from 1348 to 1350. The Black Plague swept in, killing thousands upon thousands of people. No one knew where it came from, or how to stop it. Today we've made huge developments in epidemiology and medicine, to track diseases and cure them. We know the likely source of the plague (most , and we even know what bacteria caused it (
Yersinia pestis)
1 and what antibiotics to use to kill the bacteria. It only took us a few hundred years.
Now consider this: every new generation of bacteria has a new batch of mutations in its genome, which it passes on to the next generation. That's just how evolution works. Now, before you say, "OMG, Zenoc2 - self-defined conservative Christian - said 'evolution'?!", let me clarify: By "evolution," I mean "a process that results in heritable changes in a population spread over many generations
2," which you can literally observe on the microscopic level over a period of days. Not "big bang and monkeys and no God," to over-simplify what I used to believe evolution was.
The origin of the species is a different matter entirely, with evolution being part of the explanation most of the scientific community uses to explain how we got from there to here (so my Creationist friends can quit typing angry replies now
).
So, we have these bacteria, which produce offspring with new mutations every generation. Most of these don't survive to have their own offspring, but the ones that do have mutations that help them along- resistance to certain antibiotics, for example. Lucky for us, our bodies are growing and changing at the same time as the bacteria, granting us immunity to different strains as we encounter them. It's only when we encounter a strain that slips past our immune system that we get sick.
Now, suppose we finally invent it- our very first time machine! Where shall we go? How about back to mid-1300's England. We'll go a few years after the Plague has died down, just to be safe. Except, we won't be safe. Not because of any immediate danger to ourselves (besides being persecuted as witches and warlocks for popping out of thin air wearing strange clothes and holding cell phones). No, we're in way bigger danger than that. Because even though 700 more years of natural immune system development coupled with modern medicine keeps us blissfully unaware of it, each of us is carrying
billions of germs on our bodies. Germs that wouldn't have shown up in England until 700 years later. And they're way ahead of the immune systems of the people living here.
From 1358 to 1359, the population of the British Isles is decimated, and all of Europe is in a panic about a mysterious new plague, the likes of which the world has never seen before. It could be something as harmless as
E. coli- because it's a strain from far in their future, the Europeans of the 1300's haven't had time to adapt to it, and wouldn't for another 700 years. Except now they won't, ever. And it just so happens that we have some Caucasian scientists on this trip, of European descent.
Uh-oh. We just killed off their ancestors. What now?
Alright, so maybe we'll give a point back to Hollywood-style artistic license. Maybe time prevents us from creating paradoxes like that, just so we can avoid creating plot-holes in reality. But just in case, we ban time travel into the past, to prevent our theoretical nightmare from happening. How about the future? Surely our offspring will be immune to the germs that we face today, right? Yeah, probably, but that still won't help us, so long as we intend to come back to our present time. Because now we're facing the same problem we would have thrust on fourteenth-century Europe. Our great-great-grandchildren have germs, the likes of which we've never seen. We spend just a few seconds talking to our offspring's offspring, then pop back to the present, and wouldn't you know it? We've brought their germs with us, and we end up decimating our own population.
Uh-oh. We just killed off our great-great-grandchildren's ancestors. What now?
So, moral of the story, and for people who would rather say "TL;DR": ban time travel before it's invented, so we don't have to find out whether we survive it or not.
Updates with sources:
1MedlinePlus Medical Encyclopedia: "Plague"
www.nlm.nih.gov/medlineplus/en…2TalkOrigins Archive: "What is Evolution?"
www.talkorigins.org/faqs/evolu…