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420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated April 10)

/a/ - Anime & Manga Discussion Now Available
Concrete Formula for small/medium size objects Ignore Report View Thread Reply
Polly Chorringdock - Wed, 18 Mar 2015 16:48:17 EST ID:7JSxEYqU No.6665
File: 1426711697231.jpg -(984167B / 961.10KB, 2048x1536) Thumbnail displayed, click image for full size. 984167
I am looking for a good concrete formula to pour into molds.
Currently I am using this: 2 parts portland-composite cement (CEM II), 1 part Sand, 1 part water.
I'm ok with the consistency of the mixture, it flows enough to be poured into the molds and it represents details well enough.

The problem I have with it that the surface is dusty to the touch, I'm looking for something that you can wipe fingers over it and they stay clean.
It should also be able to be done using common hardware store ingredients, and not be in the price range of specialized mixtures sold for this purpose.

The final project should be to make viable speaker enclosures with the concrete poured cnc machined EPS foam molds.
Any additives are fine as long as they are non-toxic and not expensive.

I've read about steel wool for instance.
5 posts omitted. Click View Thread to read.
>>
Oliver Candleswatch - Mon, 04 May 2015 13:45:43 EST ID:BxGNplro No.6689 Ignore Report Reply
>>6665
Sounds like the concrete hasn't properly cured. You should look up immersion curing, especially since your water to cement ratio is below .4 which will cause a tendency for it to dry out. Long story short, after the concrete sets, you need to immerse it in water for a period of time for the cement hydration to complete. The amount of time will vary greatly on temperature/etc., but that should help you out I hope?
>>
Molly Perryman - Sun, 07 Jun 2015 04:16:45 EST ID:juI5Twgu No.6712 Ignore Report Reply
powdery feel is dried out concrete. concrete can be finished with stains too which can look quite fantastic if done right. most are water based, perhaps hydrate in a stain?
>>
Molly Perryman - Sun, 07 Jun 2015 04:18:58 EST ID:juI5Twgu No.6713 Ignore Report Reply
omg OPEE pls do like a batik technique with red and maybe blue dye. then use a polishing from 60-200 grit. maybe dye after? IDK lol


how do I into muhsheen Ignore Report View Thread Reply
Walter Follerkog - Sat, 16 May 2015 08:11:57 EST ID:zW9F9Fu+ No.6694
File: 1431778317623.png -(1835384B / 1.75MB, 1077x1076) Thumbnail displayed, click image for full size. 1835384
What's the component of (what I assume machine) engineering education that makes one machine-savvy?

I'm an upstart 3D artist and I view the huge popularity of organic and fantasy-themed work among amateurs as a result of people in general lacking technical education. We just don't know shit about how anything works, we don't recognize, interpret or memorize individual mechanisms etc. Picrelated is a good example, I have just the foggiest idea why that hatch looks the way it does and I'd never reproduce most of the detail it has (I'd do a mostly featureless "Apple" casing). If I had to flesh out the innards of some factory ruins I'd have to spend a day googling stuff before even getting an idea on how it's supposed to appear, let alone withstand any scrutiny.

Even mainstream fiction's partially dominated by fantasy (when you throw out all the non-fictitious settings), you can get away with shit, man made environment is hardly ever the focus (unless were talk glowing magical gems or swords). Sure it gets botched as well, but it's easier to brush off, since it's not supposed to be historically accurate and muh magic (boy, I sure wish Vikings had that excuse). Sci-fi on the other hand... it's pretty easy to ruin the enjoyment of something through sheer ignorance the author displays.

So, how do I educate myself (on the internet, for free)? I obviously don't need to learn much about materials or the math as I'll never attempt to build anything, but I want to make believable looking machines. Even for people who know their shit. I want to be confident I can deliver something nobody will cringe painfully at.
3 posts and 1 images omitted. Click View Thread to read.
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Molly Wammernane - Tue, 02 Jun 2015 16:06:49 EST ID:uaN8rW3i No.6704 Ignore Report Reply
1433275609930.png -(2566861B / 2.45MB, 1920x1080) Thumbnail displayed, click image for full size.
>>6694

for that hatch, it's the weak point in a vessel that has to withstand a lot of pressure. the spacecraft (?) is a giant balloon, and that hatch is like sewing a patch into it. maybe it' still has to work even if something dents the outside.

in my opinion, it's better to understand the concepts and extrapolate the details, rather than copying the details (which may not make sense out of context).


>>6696

thanks for this post, I love those links
>>
Oliver Copperway - Thu, 04 Jun 2015 21:43:25 EST ID:JFQ3oC7N No.6705 Ignore Report Reply
I went to an engineering school, though my focus was more in the area of chemical engineering.

In any case, at some point, I decided I wanted more "machine-savy," which I took to mean understanding how things are actually assembled and function in the real world. In the end, I took a course in machining metal, on mills and lathes. It was at a trade school, and rather intense (3 hours per day for two semesters), but I think it gave me a perspective of these things which would be hard to get in other ways.

At one level, we were making things like threaded screws or teeth on gears. There is a lot of nuance to the design of these things, which doesn't come out unless one is designing or building them. At another level, the machines themselves (the mills, lathes, and others) had intricacies which had to be understood. Which gears to use, how to align belts or shafts, etc.

Short of going through a full course in manufacturing engineering to see all the methods by which things are made, I highly recommend the series of YouTube videos by Dan Gelbart. The man has a ton of patents, and is easily a multimillionaire from his inventions, but takes the time to sit down in an amazing shop (his personal, home shop, that would rival those in many universities or tech firms) and create detailed tutorials. If you go through the 18 videos, I guarantee you'll see the various manufactured objects around you in a different light.

For your viewing pleasure:
http://makezine.com/2015/03/20/18-lessons-smart-prototyping-self-made-billionaire/
>>
John Sebberhall - Fri, 05 Jun 2015 23:23:28 EST ID:JFQ3oC7N No.6707 Ignore Report Reply
Also recommend this one, not so much for its instructional value as that it is pretty fun to watch when blazed.

https://www.youtube.com/watch?v=Y5pen3QMgzQ


Hydraulics Ignore Report View Thread Reply
Nell Wummlelock - Tue, 12 May 2015 22:52:22 EST ID:VRaAIqx8 No.6692
File: 1431485542217.jpg -(18596B / 18.16KB, 300x376) Thumbnail displayed, click image for full size. 18596
I've been working at a hydraulic repair shop recently. Tearing cylinders apart, cleaning them, measuring and replacing seals, getting to know the details of how they work, what makes them break, and how to put them back together so they don't break as easily.

I've got two years of an engineering degree down, got sent to afghanistan, and now want to finish a degree in mechanical engineering.

Anyone know much about this area? I want to keep working with hydraulics and make use of a bachelors degree in mech eng.
>>
Fanny Sugglebit - Thu, 14 May 2015 22:46:16 EST ID:a5xmRWEe No.6693 Ignore Report Reply
>>6692
so would you say you have some experience and expertise in the practice of lifting, bro?

go work for lippert, the trailer business is booming and their hydraulics could use some expertise


Spacetime Inertia Ignore Report View Thread Reply
Albert Mannersid - Thu, 25 Sep 2014 16:31:41 EST ID:RVngPBEo No.6499
File: 1411677101937.png -(135958B / 132.77KB, 923x573) Thumbnail displayed, click image for full size. 135958
So does the "Spacetime fabric" have a capacity for inertia? It's stuff, isn't it? so if you applied enough inertia, you could warp it. And could this relate at all to zero friction, which, apparently impossible, could be approached with fluids of varying viscosity in a torus?

Some OC from our concerned TAs
13 posts and 1 images omitted. Click View Thread to read.
>>
William Purrysodge - Mon, 16 Feb 2015 20:05:11 EST ID:Jk2UBRNv No.6643 Ignore Report Reply
>>6499
Last bump I'll give this thread:
Where can I learn more about fusion? I want to help the world, but I don't know where to start learning. I want to learn as much as I can about this jazz without becoming Grant Green. Thinking what can I do to help the process along? Good sources of info. I figure one more mind working at the matter couldn't hurt.
>>
Fucking Nonningfoot - Tue, 03 Mar 2015 12:22:36 EST ID:u3tdwnEw No.6649 Ignore Report Reply
Not on the subject of space-time fabric, but is there a principle limit to superfluidics? I had read that for certain materials, superfluid rotation is accompanied by vortices in the material. With sufficient size, would there be a competition between the vortex speeds and cooling due to expansion, etc? I imagine by definition a superfluid is in an "optimal" configuration of atoms, so what would happen if it was exposed to expansion forces which exceeded some property of the system?
>>
Jack Brabblesack - Thu, 23 Apr 2015 01:05:07 EST ID:11+UlMUB No.6684 Ignore Report Reply
>>6634
Why not sound? Suspended into a combined magnetic webbing of some sort (mind you this is just me spitting shit) maybe use these magnets to potentially coax a "flow" of electrons from the "æther" or whatever you'd wanna call it. I honestly doubt what i'm thinking will output the however required to bend the universe but then again i'm just spittin shit


Plagiarism for Excel VBA coding game Ignore Report View Thread Reply
Jessica Burnesly - Fri, 09 May 2014 21:30:49 EST ID:4KbD3NyR No.6301
File: 1399685449578.png -(206318B / 201.48KB, 600x602) Thumbnail displayed, click image for full size. 206318
My partner and I submitted our engineering final project to our professor by e-mail. He then responded within a few minutes that he found an exact replica of our coding used for our program online, but in Spanish. He then e-mailed the Dean and we have a meeting with him this Tuesday regarding it.

The project we were assigned was to make The Snake Game using Excel VBA coding. Our teacher taught us probably 25% of the material needed to complete this task so my partner and I went online, went through a four part tutorial on how to make a Snake Game using Microsoft Visual Basic (VB).

We followed the tutorial, went through with it and submitted it. Our teacher submitted it to our Dean and we are meeting with him Tuesday. Is there any way out of this? We got a zero for the assignment which means my partner and I are most likely going to fail the class. She's kinda freaking out. Any advice 420?

Here's the tutorial we used in order to learn how to do the game -
https://www.youtube.com/watch?v=DbEjVDA2q20

>Inb4 Engineering college using Excel VBA
>Inb4 you done goof'd
6 posts omitted. Click View Thread to read.
>>
Jarvis Crazzlebire - Wed, 14 May 2014 23:25:49 EST ID:GVO9rLbP No.6313 Ignore Report Reply
>>6306
>I also have to do a VBA assignment and we actually are encouraged to find stuff online and use it.

There's a huge difference between:
  • incorporating other's code as a separate module in a clearly documented, clearly referenced, clearly isolated manner where your code wrap around other's code, versus
  • trying to pass off other's code as your own.
Besides, if and when they tell you that you can use something, then they will also include the correct manner to utilize that something to not be counted as plagiarism. If it hasn't explicit tell you how to include something safely, then you should assume you can't use that something just to be on the safe side.

>If your assingment doesn`t explicitly forbid using something like a tutorial your teacher won`t have shit. Just say you didn`t know and hope for the best.

Professor "won't have shit" usually will not matter to universities, since students are always presumed guilty until proven innocent. Many professors will try to lower their workload by getting their auto checks software to maximize the potential to flag any student's work as "plagiarism". If you happen to get of those professor, then it's the student's job to preempt them by properly documenting their coding process and design process. This may includes having good version control of the coding environment to show clear progression in any changes of the code, and having screen capture video recordings of the entire coding process. Universities will still get paid whether students successfully overturn any plagiarism charge or not. Professors won't lose their job if they falsely accused students of plagiarism, and any reputation risk they might suffer has been offset to the auto-checking code-matching engines.
>>
Cornelius Dullerhood - Wed, 22 Apr 2015 14:27:51 EST ID:HZh+U85X No.6681 Ignore Report Reply
>>6313

>Professor "won't have shit" usually will not matter to universities, since students are always presumed guilty until proven innocent. Many professors will try to lower their workload by getting their auto checks software to maximize the potential to flag any student's work as "plagiarism". If you happen to get of those professor, then it's the student's job to preempt them by properly documenting their coding process and design process. This may includes having good version control of the coding environment to show clear progression in any changes of the code, and having screen capture video recordings of the entire coding process. Universities will still get paid whether students successfully overturn any plagiarism charge or not. Professors won't lose their job if they falsely accused students of plagiarism, and any reputation risk they might suffer has been offset to the auto-checking code-matching engines.

i hate to agree with him, but, in the modern educational system (including but not limited to the public school systems), if someone in Authority so much as even whispers an accusation of this or that about you to the right ears, youre pretty much fucked, weather or not you copied/plagiarized so much as even a sentence of code from elsewhere, or did some other sort of no-no.

worst case scenario, imo, is you have to take your licks with a coke and a smile and shutting the fuck up about coincidental injustice, and try again either next semester, or wait 4 years and get into the next crop-rotation of students, or you could drop out of college (more or less) and strive for a purely educational purpose and just learn the stuff to know it, and forget any pretense of college credits or Goodly and Proper Documentation/Certification of skills-building for employment enrichment.
>>
Hugh Sublingworth - Tue, 05 May 2015 22:54:53 EST ID:Uzk1BXOo No.6690 Ignore Report Reply
>>6301

I swear this is copy pasta from like 6 years ago.


Are you tired of wind farms? Y or N? Ignore Report View Thread Reply
David Pebblebodging - Thu, 18 Dec 2014 08:28:19 EST ID:9NbC6G5g No.6596
File: 1418909299492.jpg -(39909B / 38.97KB, 930x620) Thumbnail displayed, click image for full size. 39909
Wind Farms - Yes or No. UK Poll by David Cameron. Do you support off shore wind farms? Or in David's words, are you tired of them?

http://metro.co.uk/2014/12/17/poll-are-you-fed-up-with-wind-farms-4990896/
4 posts omitted. Click View Thread to read.
>>
Sophie Beffingmune - Mon, 02 Mar 2015 20:38:59 EST ID:a5xmRWEe No.6647 Ignore Report Reply
>>6596
integrating them into existing/new structures seems like a much better idea.
>>
Fucking Nonningfoot - Tue, 03 Mar 2015 12:19:13 EST ID:u3tdwnEw No.6648 Ignore Report Reply
>>6599
A comparison can be made to nuclear technologies. The U.S. government invested more than 25 billion before the first commercial plants were produced. Since then they've gotten more improved.

Nuclear is even more alluring because wind turbines have fundamental issues that prevent them from enhancing efficiency that are well researched. Only reduction in cost is from reducing the material cost, or reducing losses in storage or transfer, which aren't likely to substantially reduce (though storage may come down because of the companionship with solar futures).

Nuclear has thermodynamic limits, but it is incredibly potent as-is, and a slight improvement in materials can lead to a dramatic improvement in power output (say if the operating temperature can be bumped from 100C to 200C, the efficiency goes from like 30-40% to 50% or higher)
>>
cuntwaffle - Mon, 16 Mar 2015 19:47:41 EST ID:N2aieJam No.6664 Ignore Report Reply
Yeah it would be good


Arduino: More Analog In? Ignore Report View Thread Reply
Pez - Sun, 15 Mar 2015 16:56:40 EST ID:xfGCXuR4 No.6658
File: 1426453000836.jpg -(786482B / 768.05KB, 1297x708) Thumbnail displayed, click image for full size. 786482
Yo, I'm making a MIDI sequencer using an arduino mega. As standard it's got 16 analog inputs. However, the sequencer I'm making has 16 steps, and I want each to have it's own frequency knob as well as velocity knob, and there may be a couple more needed elsewhere on the controller, so I'm looking at 32+ analog ins.
I've seen I could get a multiplexer to increase inputs, but from what I understand I'd have to first select the knob I wanted to control and only then the value would be read. Whereas what I want is for the changes to be instantaneous, so I could change several knobs at the same time without having to select them. Anyone got any advice on this? I'm stumped.
2 posts omitted. Click View Thread to read.
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George Fopperworth - Sun, 15 Mar 2015 19:48:51 EST ID:7JSxEYqU No.6661 Ignore Report Reply
just figured just npns should be fine wired correctly.

If it's not clear you measure pot groups in turns.
>>
George Fopperworth - Sun, 15 Mar 2015 19:55:39 EST ID:7JSxEYqU No.6662 Ignore Report Reply
oh and you won't get the full 10 bit range because of the voltage drop with the same power supply, it won't hardly matter though, since all you need is 7 bit.
>>
Pez - Mon, 16 Mar 2015 04:42:32 EST ID:xfGCXuR4 No.6663 Ignore Report Reply
1426495352891.jpg -(74402B / 72.66KB, 500x350) Thumbnail displayed, click image for full size.
Cheers guys. Feel a bit dumb now for not realising this


cell phones Ignore Report View Thread Reply
Nigel Humbleforth - Mon, 09 Feb 2015 20:00:06 EST ID:fN3OkH88 No.6636
File: 1423530006917.gif -(43189B / 42.18KB, 808x430) Thumbnail displayed, click image for full size. 43189
anyone know how the fuck they like work?

what invisible wireless wave is being transmitted, how is it being bounced around, how is voice channeling through it....someone explain in laymans terms.

do you need a degree in mathematics to get into it?
3 posts and 1 images omitted. Click View Thread to read.
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Hugh Fobblehere - Fri, 06 Mar 2015 05:07:08 EST ID:jhx2sN62 No.6652 Ignore Report Reply
>anyone know how the fuck they like work?
They don't. In fact they hate work.They are all wage slaves, doing 24/7 shifts with no inspiration, no joy, no soul. Every time you play candy crush with them you crush their will to live a little bit more.
>>
Nathaniel Worthingdale - Thu, 12 Mar 2015 00:38:22 EST ID:0sTD210V No.6655 Ignore Report Reply
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>>6652
I like this guy!
>>
Phineas Sandernone - Fri, 13 Mar 2015 14:17:03 EST ID:l5K6dQD4 No.6656 Ignore Report Reply
>>6640

Or maybe they just don't want people coming in here asking retarded questions. "How do cell phones work" is kind of a retarded question, because it so vague. Now if you wanted to know something specific, like how 64QAM encoding works, or how radio resource controllers work, or how the 3GPP core network operates, then maybe you'd get better responses. Cell phones are massively complicated systems with lots of moving parts, to break it down into "lay man's terms" is a bit more complicated than coming in here and feeling entitled to get a helpful answer from a bunch of strangers on the internet about a question that was too vague to be answered in the first place.

tl;dr google a little bit before coming here and making yourself look like a retard


Smart grid Ignore Report View Thread Reply
Ernest Smallfield - Fri, 12 Dec 2014 19:25:12 EST ID:JMPcUwP+ No.6591
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Google is going to take over the electrical grid if the current grid operators don't get their shit together
>>
Fanny Wappercocke - Sun, 14 Dec 2014 01:05:18 EST ID:RHrdZjYH No.6592 Ignore Report Reply
What about the potential grid operators?
>>
Samuel Duckwill - Sun, 14 Dec 2014 11:51:37 EST ID:FJ+CwDYK No.6593 Ignore Report Reply
Smart grid is still very much in development, but it's in the works. Settle down.
>>
Priscilla Worthinglock - Wed, 04 Mar 2015 01:48:41 EST ID:8VWWDfSO No.6650 Ignore Report Reply
>>6592
Well played


Integrated Engineering Ignore Report View Thread Reply
Isabella Fablingfire - Sat, 31 Jan 2015 07:07:59 EST ID:RrEHCrtw No.6629
File: 1422706079296.jpg -(31555B / 30.82KB, 720x240) Thumbnail displayed, click image for full size. 31555
What's integrated engineering?
Is it worth studying?
1 posts omitted. Click View Thread to read.
>>
Molly Nevingwag - Tue, 03 Feb 2015 15:20:32 EST ID:RrEHCrtw No.6633 Ignore Report Reply
>>6631
Google doesn't say much.
Thought that maybe someone here has more experience with this.
>>
Ernest Hillychog - Sun, 22 Feb 2015 14:24:50 EST ID:pJzFTu+g No.6645 Ignore Report Reply
A meaningless phrase that means exactly the opposite of prospects for employment.
>>
David Mannerfuck - Sun, 15 Mar 2015 04:29:39 EST ID:K8DcdBNM No.6657 Ignore Report Reply
>>6629

Jack of all trades master in none engineering.

Major in a real engineering field and double major or minor if you can't decide on one.


Best calculator for university? Ignore Report View Thread Reply
Walter Bittingsurk - Mon, 26 Mar 2012 19:44:13 EST ID:8aModPV6 No.3821
File: 1332805453900.png -(131061B / 127.99KB, 200x401) Thumbnail displayed, click image for full size. 131061
Hey, Im goign into engineering next year and a graphing calculator is required for the course. In school we use TI-83s but I know people who swear by HPs. Which is better? which do you reconmmend? and how much more advanced are the new TIs as opposed to the 83s?
60 posts and 9 images omitted. Click View Thread to read.
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Reuben Bluddlewell - Sat, 15 Nov 2014 09:29:02 EST ID:36+HhpqM No.6571 Ignore Report Reply
>>4033
that doesn't look easy to work with at all
>>
Archie Borrymot - Tue, 13 Jan 2015 05:35:10 EST ID:54PAU9X5 No.6619 Ignore Report Reply
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>>3821

best calculator is my dick
>>
Fucking Shakeman - Sat, 21 Feb 2015 19:02:47 EST ID:oy3G78FX No.6644 Ignore Report Reply
>>4052
you can easily use mathematica or sage online


Mastercam Home Learning Edition Ignore Report View Thread Reply
Molly Grandford - Wed, 11 Feb 2015 14:56:16 EST ID:H+wkwIJT No.6638
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I'm currently in a course covering Mastercam. My book (X7 version) came with an educational version of the program but unfortunately it can only save in a gimped file type (.emcx-7 instead of .mcx-7). I would like to be able to work on things at home to bring into class and post the file there. However, not only am I unsure whether a legit copy of Mastercam can open the student file, but as we are learning on X6 in class it wouldn't be able to regardless.

Would anybody happen to know possible workarounds to this? I opened up a normal .mcx-7 in my student version and tried to trick it with auto-save/backup but that didn't work of course.

I do actually have a cracked version of X6 on my broken laptop; its screen and GPU are busted up but I can connect an external VGA monitor. I figure it would be possible to use that in some sort of conversion pathway. I am too worried to try, though, because I am not sure if there would be some type of 'pirate' residue left inside the file that would be detected on my class computer which is legit with HASP key, etc. Not only do I want to keep myself out of trouble but my school and instructors as well.

I figure I'm pretty stuck as is but thought I would ask anyways.

Also, from my little experience with the program it does seem to have many decent abilities and potential but at the same time there are a whole bunch of seemingly simple things that are buggy as shit. Overall it seems pretty unrefined even if it has whatever capabilities, but that's just my opinion. Anybody else have experience with/opinions on Mastercam?

Maybe resources to help me be awesome at CAM too.


IBEW Aptitude exam Ignore Report View Thread Reply
Nigel Blackham - Mon, 02 Feb 2015 02:22:22 EST ID:13NkwJyT No.6630
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I'm not sure If I might be better off posting this on /howto/ but I feel like I might have a better chance of finding an electrician here.

I'm interested in applying for an electrician's apprenticeship through my local IBEW/NJATC training center (VA, U.S.) the only problem is I'm having a little trouble finding out exactly what I'm supposed to know for the entrance exam. All of the sources I've examined seem to agree that reading comprehension based on passages and numerical pattern recognition will be present, but other than that several of the sources I've found disagree. Some of them say that the test involves math up to trig (sin, cos, tan, etc.) but this is in the minority. Most seem to suggest it's just basic algebra, i.e. functions and general math.
I found one alleged study guide that said it would specifically focus on math involving fractions and decimals, and then have a section based on "paper folding" (visualizing folded paper in one's mind and figuring out a pattern).

I'm hoping someone here might have gone through this recently, or at least recently enough that they can give me a first hand account of the subject I should expect. With the exception of the trig I've got a pretty good grasp on the other potential topics, I just want to make sure I'm studying the right materials and that I don't waste time studying things that won't end up being on the test.

Thanks for any help.
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Fuck Peffinggold - Mon, 02 Feb 2015 21:34:58 EST ID:a5xmRWEe No.6632 Ignore Report Reply
>>6630
you should call the organization, these places are usually pretty people friendly in my experience.


Volafile Ignore Report View Thread Reply
David Findlewill - Sat, 31 Jan 2015 00:43:55 EST ID:YxxDX9gl No.6628
File: 1422683035730.gif -(45419B / 44.35KB, 468x240) Thumbnail displayed, click image for full size. 45419
I just found out that the 420 room on Volafile is still a thing, and I thought of /tesla/, since you have a hunger for textbooks, it'd be a good way to share/request.
https://volafile.io/r/Dni_HR

Files posted last two days, before auto-erasing.


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