It was the first day at school of Marty McFly's last year of high school, and he was a bit nervous even though he'd had lots of first days. He put on his best outfit so that Jennifer Parker, his beautiful girlfriend, would see him cute. He also put a notebook and some other things like a pen, a pencil, a rubber and a ruler on his old satchel and he went to school on his skaterboard. once he got there, he found lots of class mates and he said hi only to a few of'em because the person he really wanted to find was Jennifer. Finally, they found each other and the kissed lots of times until they had to go to class. the first class of the day was Physics, not exactly Marty's favorite subject but he had heard there was a new profesor who everybody was talking about so he decided to give Physics a chance. Everybody was talking in the class while they were waiting for the profesor to arrive. After a few minutes a tall man with messy white hair came into the classroom. Everybody stood up to meet him. Marty looked at him and thought he seemed like a nice guy, and suddenly without knowing the man he thought that from then on Physics would be a much interesting subject.
-Hi everybody, I'm Emmett Brown, you new Physics profesor. Let me tell you my teaching method is ultimately active so you'll have to do lots of things and see lots of experiments I'll show you. But first I'd like to meet you all.
Profesor Browns made everybody tell his name and their favorite subject. Several kids talked, then it was Marty's turn.
-I'm Marty McFly, and I...mhh...i don't think I have a favorite subject... i like maths, a bit...
Profesor Brown gave Marty a strange friendly look and then he followed with the rest of the class.
Brown's class was about time, could it be changed, could there exist different time lines all at the same time, could time be travel through? That was a question all the kids at the class wanted to be answered. When the class finished and everybody left the room Marty approached the profesor.
-Excuse me profesor Brown, i just wanted to tell you i found your today class really interesting but there were some things i could barely understood and, mhh, i was wondering if you could and and would want to explain me more about all this stuff...
-But of course, that's one thing i love to do, explain the thing I'm interested in
-Great
-Would you mind coming to my lab now? It'd be easier to explain you there
-Sure, no problem!

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It will continue

It's a great start so far. Sounds like a very interesting premise.:)

Welcome to the board, sheker9! :) B)

second part of the fan fic!! :D

Marty and the Profesor Brown walked to the lab. Once they got there, Marty could see it was very very messy, and it had the looked as if someone would have been working there.
-I'm sorry for all this mess, I didn't have much time to clean this place up in the morning- said the profesor
-Ohh it's ok, i don't mind, I'm very jumbled too.
-Haha, well anyway you want something to drink or eat?
Marty didn't want to bother the profesor so he decided not to accept
-Mhh, no I'm fine, thanks very much.
-Ok, so...you want me to explain to you all this stuff, but...I don't know were to start from.
-Well, I was interested in the thing you said, when you said or actually asked if time could be travel through.
-Ohh, yeah, well that's an interesting subject. I asked that question because according to some scientists if you can reach the speed of light without disintegrating yourself, well maybe you could travel through time.
-Are you one of those scientists?
-You mean if i support that theory? well, honestly i don't know what to believe but i try to open my mind to reflect about other opinions. I'd like to believe time travel is possible, but i don't know...Actually I'm making a small experiment about time, but unfortunately I'm not able to show it to you yet.
-Ok, no problem. You know, I read somewhere that the speed of light is 300.000 miles per second!! is that right??!!
-Unbelievable as it is, it's true!! amazing right??
-Well, yeah!! that's impresive
Marty and the profesor talked for a long time about all this time things, and a couple of hours went by.
-Profesor Brown, I think I should get going, it's getting dark.
-Ohh, alright kid, see you tomorrow, right?
-Of course, good night profesor
-'Night!!
Marty left the house, and on his way home he was thinking about the conversation he'd had with the profesor, he really seemed a cool guy and even though Marty didn't know him much he felt comfortable around him, like he knew he was a good person.

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Hope you'd liked it, bye bye!!

and the fan fic continues:

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The next day Marty went to school again but he didn't have Physics on Tuesdays, so he didn't get to see the profesor Brown. When he finally could go out of school, he and Jennifer went to a cafe to talk for a while couse unfortunately they didn't share any classes at school because they were in different years.
-So Marty, how was your day- started Jennifer.
-Well, a bit bored but...it's been ok, yeah. so how was yours?
-Hard, lots of test.
-Ohh too bad. You know, I wanted to tell you something Jen.
-So tell me.
-Well, you know the new Physics profesor, right
-Right...
-Yesterday I told him I'd liked his class very much and that I wanted to know something more about the subject, so he invited me to his lab and i went there and you know, he seemed like a great guy to me.
-Well I also thought he was very cool too. But I never knew you liked Physics Marty!!
-Well I didn't...so far. I found his class sooo interesting that now I want to have the next one!
-Wow, if you wanna go to class he must me a great profesor
-Haha very funny Jennifer
-It's the truth haha.

When Marty arrived to his house that afternoon, he looked in some of their parents' books to find something more about Physics, specially time. He read lots of things, and there was a point when he was so tired that he fell asleep on the coach.
He woke up th enext morning and he realized he had to hurry if he didn't want to be late to school.
The first two hours were very bored, he had English and History but then it was the turn of the Physics class. The profesor Brown gave an interesting clase and at the end of it he called Marty.
-Yes, profesor-he said when he was near him.
-Do you like rock'n roll?
-Of course!!
-I've got something in my lab I think you'll like very much.

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to be continued
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Sounds good, so far! :)