TT1.10: Time Doubt

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Carrie blinked a couple of times as Frank opened the door. He looked just as he had two days ago. She smiled triumphantly. “I did it!” she declared. “I changed the past.”

“Ah! You’re the Carrie back from Friday?” Frank ventured.

Carrie frowned. “Who else would I be?”

Frank shook his head. “Never mind. Come in, we need to discuss this history changing that you claim to have accomplished.”

Carrie was barely able to contain herself until they’d arrived downstairs. “All right,” she stated, putting down the time machine. “Sorry for not saying more on Friday, but time travel is confusing enough already without me possibly explaining things to you before I leave to do them. But now… well, okay, first tell me what weirdness you remember as having happened at school, during Friday’s chemistry class.”

Frank nodded. “The fire alarm went off and the school was cleared out. Upon returning to class, we discovered that some of the chemicals in class had been spilled or mixed up during our absence. Vandalism was suspected.”

Carrie clapped her hands. “THAT is what I changed!” she said. “The first time around, Julie had a plan to switch up the chemicals, to make you look incompetent.” She fished the small recording device out of her pocket and tossed it onto the table. “And I have the proof of that original history right there!”

Frank blinked. “Julie planned–” He cut himself off and passed a hand over his forehead. “Never mind. Listen, Carrie, I suspected you’d been trying for something like this when you were here after school on Friday. The thing is, whatever you were setting out to change… whatever Julie’s original plans were… they never happened.”

“I know. Because I changed them,” Carrie stated matter-of-factly.

“No! That is, you affected things, but in the end you simply fulfilled what had already taken place!” Frank countered. “And if you’ll finally LISTEN to me, I think I can explain this in a way you’ll understand! But Carrie… you’ve got to give me a chance here. At least one, please!!”

Carrie stared. Frank was actually getting upset here. So much so that Carrie was finally forced to admit to a certain curiosity as to why he was so adamant about what he was saying. Add to that the fact that she would need his help with the time machine, as had been demonstrated by the fact that she hadn’t been able to adjust it for her return… “Okay, fine, throw your theory at me,” Carrie acquiesced, crossing her arms. “I’m sure I can point out the flaw in it.”

Frank sighed in relief. “Great! Now, the best scenario I’ve come up with to illustrate the fixed nature of time is the grandfather paradox. Simply put, I go back in time and kill my grandfather before my father is conceived. So, can you explain who killed my grandfather?”

Carrie shrugged. “You just said you did it.”

“But now my Dad hasn’t been born so obviously I don’t exist and hence couldn’t have done it!”

“Oh. Good point… um, someone else did it then. A time traveling stowaway.”

“Assume no stowaways,” Frank clarified. “I’m the only time traveller. How do you explain it?”

“No other time traveler? Well then… you shot the wrong person by mistake. Maybe you were adopted without realizing it. Or it was the right person, but you were conceived by the milkman.”

“What? Er, no.” Frank frowned, and Carrie got the impression that he was becoming troubled by her responses. “See, the whole point is that it’s an unresolvable paradox. There is no real answer. The only way out of it is to declare that I cannot kill my grandfather in the first place! From this, we can extrapolate an unchangeable past as…”

“No, Frank, we’ve established that your grandfather got killed. Someone must have done it,” Carrie said, unintentionally finding herself being pulled deeper into the conversation. “Thus, after you fire the shot, things will change such that – if it’s not possible for anyone else to have fired the shot – the person you killed is no longer in your family tree.”

“Carrie, stop,” Frank protested. “The whole point is that I’ve gone back to kill my grandfather. Not someone else!”

“MY point is he WAS your grandfather until you changed history. The fact that your lineage is now different, making him unrelated, is simply your own damn fault!”

Frank rubbed the side of his head, mulling that over. “This isn’t working out like I’d hoped,” he finally said.

“No kidding,” Carrie retorted.

“Okay, give me a second here,” Frank requested. “I think the trouble is that you’re trying to latch onto the multiple time tracks theory, while there’s better arguments for the principle of self-consistency.”

Carrie peered. “Is that so?” she asked warily. “What’s so wrong with this ‘multiple time tracks’ theory then?”

“It doesn’t flow as well,” Frank stated, starting to snap his fingers. “How can I put this… aha, wait, diagrams!” He went over to his chalkboard and started erasing some old formulas. “I think you mentioned ‘Back to the Future’ once… ever see the sequels?”

“Yes,” Carrie admitted. “I don’t know that they were as good, but it was during an uneventful weekend and the first one had piqued my curiosity.”

“Okay, then you might recognize this argument a bit, it’s connected to the second movie.” Frank drew a straight horizontal line across the blackboard. “Imagine that this line represents time. Here’s the present.” He wrote a large P in the centre of the line. “This delimits the past and the future.” He wrote ‘PAST’ to the left and a large ‘F’ to the right.

“Now, by your theory if I travel from this point in time…” (Frank indicated the P) “…to somewhere in the past…” (He moved to put an ‘x’ above the line in the past) “…and kill my grandfather, the timeline will be skewed into an alternate present.” Frank proceeded to draw another line from the ‘x’ traveling diagonally downwards towards the bottom of the blackboard. He eventually levelled this line off at the centre and wrote ‘P-prime’ over it. “Results in multiple time tracks.  Follow?”

Carrie nodded slowly. “Seems fine so far.”


…this alternate primed present…

“Right then.” Frank dropped the chalk and dusted his hands. “The problem is that the me who traveled back in time came from this original timeline,” he stated, pointing at the first ‘P’ he had drawn. “Yet if I were to return from Past to Present, it would now be this alternate primed present,” he continued, indicating the second track. “In which I discover that there is now an ALTERNATE version of me with a different grandfather.  A nasty time paradox that we wouldn’t get with my self-consistency theory.”

Carrie shook her head. “You misunderstood me. There is no paradox if the timeline is smart enough to change things such that you don’t notice any difference in this alternate present,” she pointed out. “Your alternate self could even have had a reason to leave that timeline for the past too. Perhaps becoming you in the process. So when you return to the present, you simply pick up where that alternate life left off – with evidence of the change.”

Frank paused, looking back at the board. “Yeeeeees, I suppose,” he agreed hesitantly. “But that results in a lot more temporal details to take care of. That’s… chaotic, confusing and hard to sort out.”

“Hence you prefer your less chaotic theory,” Carrie remarked dryly.

“Well, yes. With self-consistency, we get what I was saying before. Any changes made were fated to happen anyway!” He proceeded to erase part of his initially drawn line, the part lying to the right of the ‘x’ in the past. Then he erased the ‘prime’ next to his second P. “There is only ONE present. It’s not an alternate. Any kinks that exist in the timeline have always been there, as a result of us fulfilling our individual destinies.”

Carrie frowned, shaking her head slowly. “But the way you’re making things look now… the future itself is already mapped out too. You’re eliminating free will!”

Frank scratched his head. “Well, yeah, kinda. That’s the one little sticking point. But this IS the most sensible theory out of all the ones I’ve come across. Remember, I’ve had two years to look into this! More than that, it explains what’s been happening with our time incursions thus far. For example, that crystal swan of yours.”

Frank pointed to the past ‘x’ again. “Let’s say that this is when it broke for you two years ago. From then on, we’ve been living the rest of this timeline.” Frank gestured at the skewed line on the board. “Now, when we finally reached Thursday, you traveled back to break it. You didn’t change anything. It had already happened! You were only fulfilling a destiny of sorts.”

Carrie folded her arms back across her chest and stared at the blackboard for an extended period of time before speaking again. “I disagree. I think it’s equally possible that, as soon as the swan broke, my brain changed to remember the past alteration, as opposed to the way things originally took place. What’s wrong with that argument?”

“Well…” Frank began to fidget. “Well, nothing on the surface, I guess,” he admitted. “But if that really is the case, then the time traveler themselves is not immune to the effects of changed time. Meaning after you change something, you’ll remember only one timeline anyway. Beneath the surface, what’s the difference?”

“The difference is that I could get my mother back – and even remember growing up with her around!” Carrie fired back triumphantly.

Frank gaped. He looked from the chalkboard to her and back again. “No, but… but no! You wouldn’t remember making that change!” he objected. “And what if, after making such an alteration, you end up in a present you find even more unbearable? You might then want to change things again – creating whatever situation you had in the first place! You’re now in an endless loop, so again, what would be the point?” Frank turned back to Carrie to see her glaring at him with pursed lips. This was the only warning he had before her fist came flying at his face.


“Sorry about that,” Carrie mumbled.

“Yes, well… I suppose I was sort of speaking without thinking,” Frank responded, dabbing at his face with the ice filled handkerchief. He’d just come back downstairs after spending fifteen minutes getting his nose to stop bleeding.

“Damn right,” Carrie fired back. “You not only implied that I could be behind my mother’s disappearance, but that having her around would be worse than how things are now. That’s… that’s appalling!!” There was a brief pause, after which Frank saw her start to twirl some hair in her fingers. “Though, ah, I do hope this won’t affect your decision of whether or not to help me time travel. I… I’m realizing I have some impulse control issues where my mama is concerned…”

She still wanted his help. Frank prodded his nose experimentally. Truth be known? He still wanted to help her. He wondered what that said about his psyche. “Yes, well, I have always been willing to do more with this time travel stuff – I wouldn’t have spent time coin collecting if I didn’t. But Carrie, please tell me that you understand that there ARE issues to consider before simply tripping into the past? I mean, we’ve been stranded once already! I don’t think we want that to happen again, do we?”

Carrie shuddered visibly. “True, we don’t want that.” She frowned in thought. “All right then. How about this. If YOU agree to keep an open mind about the possibility of fixing things with my mother… I’LL agree to back off a bit until we know more about what we’re dealing with. Since my theory implies that I might not remember waiting a few extra weeks anyway.”

“I guess that’s reasonable,” Frank consented, sinking into a chair and tossing the handkerchief aside. “Thank you. I’m glad we’ve got that of the way.” He looked over at the lab counter. “Which brings us to the question of the time machine itself.

“I think it’s safe to assume that this technology comes from the future. Which either means it was sent back here for some reason, or… well, or there’s a person from the future running around in our present looking for their time machine. Now, I never saw anyone suspicious lurking around the ravine this last week, when it supposedly turned up. I don’t suppose you ever ran across anyone other than me down in there, did you Carrie?” Frank cleared his throat. “Carrie?”

“What? Oh, sorry….” The blonde girl shook her head. “You’ve reminded me of something. From back when we were trapped in the woods. That nickel I used in the machine, it was given to me by a strange man. A strange man who seemed to know that it was exactly what we needed. As if he knew why we were stranded there.”

Frank sat bolt upright in his chair. “What? Did this person mention the time machine?”

Carrie shook her head. “Not specifically. Not directly. All he said was…” She paused, brow furrowing as she tried to recall. “He gave me the nickel, then said, ‘It’s yours now. Do what you will with it. Just guard it. Don’t let anyone take it away from you.'”

“Don’t let anyone take the nickel away from you?” Frank wondered.

“The guy might not have had all his marbles,” Carrie admitted. “The two others he was with didn’t seem to think highly of him… though again, they didn’t seem to know him very well either. Maybe this ‘Shady’ guy thought they’d take the money away from me?”

Frank frowned. “Guard it. Don’t let anyone take it away from you,” he repeated. He found his eyes being drawn back towards the table. “Could he have been referring to the time machine itself?”

Carrie followed Frank’s gaze to the enigmatic black box. “I don’t know. But I’m not the type to lock that time machine up somewhere safe and forget about it! If he wants someone to ‘guard’ the thing, surely I’m not tops on his list.”

Frank rubbed his forehead. “We’re also speaking of events that happened two years ago. Yet you only found the machine this past week. The only way this makes sense is if he knew back then that he’d be leaving it somewhere for you to find in the future.”

“But if he knew two years ago that I would get it, why not give it to me back THEN?” Carrie pointed out, apparently irritated.

The two teenagers stared at each other in puzzlement. “I’m getting the impression that there’s something bigger than we realize going on here,” Frank remarked.

“You could be right,” Carrie admitted uneasily. “Frank, have you told anyone else about the existence of this machine yet?”

“No. I figured no one would believe me until the proof turned up. Or that if they did believe me, they would want to get involved, and I didn’t want to deal with that either.”

Carrie nodded. “Then let’s keep the machine’s existence to ourselves. At least for now.”

Frank nodded. “I’ll go along with that.”

“Good.” There was a moment of silence. “Then perhaps I’ll leave it with you to conduct any necessary tests. However… before that, there is one last thing which I feel I must do.”

“What’s that?”

“Try to keep myself from traveling back to Friday.”

Frank blinked, standing back up. “Pardon?”

Carrie passed a hand in front of her eyes. “Frank, on Friday I got so caught up in my need for changing things that I yanked down on the school fire alarm and messed with your chemistry lab. Even though no one was hurt, that was WAY out of line. Even for me. I have to at least make an attempt to undo it, or I’ll never be able to live with myself.” She took in a deep breath. “I figure the easiest fix is for me to stop myself from traveling back in the first place. After all, if you’d been a little more convincing this morning, maybe I wouldn’t be in this situation!” she pointed out.

Frank ignored her attempt to shift blame. Instead, he considered a couple of different replies, based on what he already knew from that morning. He settled for saying, “Carrie, you must realize that you won’t succeed.”

“I admit that after our discussion, the point sounds almost moot, in that if works, we may not know that it did. But damn it, I have to try. The machine is set for today, I still have one current coin with me… all I can hope is that I somehow randomly travel back to a lot earlier in the morning.” She half smiled. “Maybe it will even erase me hitting you.”

“Carrie…” Frank began again, before stopping himself. Would he invoke a time paradox by telling her that he’d already witnessed her failure? “Be careful,” he concluded.


…grabbed the piece of fruit…

Carrie nodded. “Actually, I haven’t encountered any location problems when traveling by myself. I’ve ended up near the ravine out back of my house every single time. Though on the off chance something unexpected happens, I’ll take your apple to eat, okay?” Carrie dropped her coin into the time machine, then grabbed the piece of fruit off the lab table.

“Talk to you later then?” Frank remarked.

“No, hopefully earlier,” Carrie retorted. One pull of the lever later, and in a flash of light, she’d vanished yet again.

Frank shook his head as he went to get the hidden time machine – the one left behind when Carrie had arrived from the trip for which she’d only now departed. Some aspects of this time travel stuff really would take some getting used to… but hopefully there would be some answers in the device. He now had all evening with which to examine it.

For instance, it was curious that all of Carrie’s solo time jumps were taking place in town. That had to be more than coincidence. Could it have been his presence that caused the greater distance? In fact, Carrie had said she’d always been ending up near her house… except for that last trip. So she had departed from his house twice today with two different arrival points. Had there been any difference between the two trips? He’d noticed both had been with quarters, so it wasn’t that. Something she was carrying, perhaps? No difference came to mind there either, except for that apple.

Frank leaned against the table. The apple. Where exactly had it come from? He didn’t keep fruit down here. No, Carrie had dropped it off in the morning, after time traveling, then picked it up before leaving on that very same trip. … What?

Had she switched it for another apple somewhere outside the house in between? MUST be. The alternative was spontaneous creation from thin air! Yet by Carrie’s perspective, she had only minutes between when she picked up the apple, sprinted back here, and dropped it off. But then… what was its origin?

On second thought, maybe he could use a break before examining the machine. His head was starting to hurt.

(Carrie Time Tracker: To Carrie-9)


Frank was still puzzling over the problem some time later when the home phone rang. Being closest to a receiver, he picked up. “Hello?” he said absently.

A male-sounding, yet strangely flat voice spoke to him. “Frank home?” it inquired.

“Speaking. Who is this?”

There was a pause before the emotionless response. “Julie suspects.”

Frank froze. “Pardon?”

Another pause. “Julie suspects. About your time machine.”

Frank gripped the phone a little harder. “Who is this? Carrie, is that you?”

Again a pause, and the monotonic male voice concluded, “Take precautions. Watch your back.”

“But who are you? What precautions? What’s going on?” Frank asked.

The caller had already hung up.

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  1. 5 I think. Read the first half of this. Ooh, the grandfather paradox. I prefer Carrie’s take on it. If time travel exists AND free will exists the grandfather paradox cannot be an insurmountable problem. Incidentally, have you come across the archers paradox? That’s an interesting one. I really need to blog about that.

    And spontaneous creation of apples. Nice.


    1. Yeah, I think it would be hard to write time travel fiction without referencing some of these classic paradoxes at least once. Glad you like Carrie’s version.

      I’m perplexed by your mention of the “archers paradox”… I looked it up, and it seems to reference the fact that arrows undergo side-to-side motion when being shot, so you can’t necessarily aim directly at a target. Not very temporal? After a bit more digging this morning, I’m wondering if you mean “Zeno’s Paradox of the Arrow” which references an arrow being at rest during it’s flight by chunking time into instances of “now”. I have heard of the latter (Zeno’s paradoxes have some interesting mathematical connections). But maybe that’s not what you meant at all.


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