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/sci/ - Science, Technology, Engineering, and Mathematics

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New Textbook/Book Request Thread deadbabies ## Mod ## 13/08/25(Sun)06:03 No. 15270 ID: f34135 [Reply] Stickied

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First off, hello there, I'm deadbabies, and I will be taking over as /sci/ moderator. Rules will remain the same. Please use the report function if you see posts that violate the rules, but also do not abuse it.

I have officially expanded the scope of /sci/ a bit. You may discuss Science, Technology, Engineering, and Mathematics here now. No science is discriminated against as long as it's of the peer-reviewed variety. If someone wants to discuss Anthropology or Social Science, by all means, let them. If you do not like it, just don't post in the thread.

The IRC channel #/sci/ is now (finally) re-registered and I am running as operator on here. Feel free to stop by and say hi. I do leave my computer idling on IRC, so check back or leave me a message if you have any ideas, suggestions, or just want to tell me off. You can get onto #/sci/ by joining the server irc.7chan.org at port 6667. You can also use SSL at port 6697 but you will have to set your client to accept invalid certificates.

ADDITIONALLY and IMPORTANTLY I have had several requests on IRC regarding the old Ebook FTP that we used to have. Unfortunately, the mod who ran it entered the military and no longer runs or maintains it. I have no plans to make another one, but if one of you guys would like to, by all means advertise here.

That being said, I'm just going to leave this link here:


You may find what you seek here.

I will be unstickying the old ebook/source articles thread. Please post any new ebooks/source articles here, and feel free to post any working links from the old thread there; I will eventually be deleting it.
Message too long. Click here to view the full text.

14 posts and 2 images omitted. Click Reply to view.
Solutions Manual to E&M, 3rd Edition by Purcell Anonymous 16/11/19(Sat)00:05 No. 16384 ID: 1ae570

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Looking for the the solutions manual to Electricity and Magnetism, 3rd edition by Purcell and Morin. The problems are much more difficult and numerous than in the previous two editions, making it one of the best problem books on the subject. Was able to find the solutions to two analogous books in Classical Mechanics:



Sadly, all my searches for the solutions to the E&M book have been fruitless. It's the last manual that I need to complete my collection.

/sci/ , " TEACHING IS HARD , NO WAY , ! " , better than India , Anonymous 17/02/18(Sat)06:43 No. 16459 ID: 89bc45 [Reply]

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" You can be a teacher in an inner city school , especially in The United States Of America , as a The United States Of American , that is far easier than being a Cracker Barrel Manager , in india , . " , what reason do you people let indians touch any education that is not proper hygiene and basic road construction , ?

BEEN OVER 2,000 YEARS /sci/ , AND INDIANS STILL NOT ALL BATHED , ! Anonymous 17/02/18(Sat)06:58 No. 16460 ID: a710e1

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Anonymous 17/02/08(Wed)13:57 No. 16453 ID: eb6b3b [Reply]

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The Vaccination of little Tommy Autistic.

When Tommy was a wee little lad at 4 years old, his mommy took him to a tax payer funded doctor's office to get a "booster shot." Little Tommy had no idea what a booster shot was, but he went in excitedly, mostly just because the waiting center had a little play area for him and other kids to play with blocks and such. It was then, when doctor told Tommy's mommy that it was time for Tommy to get his first booster shot! As Tommy sat down on the white papered bed, the doctor approached him with a big scary needle. OUCH! The needle pricked Tommy in the arm, and Tommy could not stop crying. The needle hurt Tommy, and Tommy had no idea why his mommy would let Tommy get hurt by this strange doctor. You see Tommy's mommy was a feminist in the 1960's who took part in the "revolution" for "female rights." She used to be what people would call, a "hippie," but after all her youth experimenting with various drugs, she decided to take her chruch's big business funded AA program's advice, and settle down and have a kid, in order to put her life back together. While she was in school, she "learned" that "vaccines eradicated disease" because they are "disabled" virus DNA that serve as target practice for the immune system's anti-bodies, so that way the immune system would be extra ready when a "live and active" version of the virus came around. She read in her government funded biology book how a Jewish doctor, Edward Jenner, "figured" this all out because his milk maidens, who were regularly exposed to cowpox, were relatively immune, so he created a concoction out of small pox pus, which contained the remnants of the disease, and inserted the pus into people's blood streams! It was all so sciency and believable to Tommy's mommy! After all, why would she be going to school if all this stuff was not true? Tommy's Mommy's also learned about diseases like polio and rhuebella, and tetanus, and measles oh my!

2 posts omitted. Click Reply to view.
Anonymous 17/02/08(Wed)14:02 No. 16456 ID: eb6b3b

Jacob explained the reason why Tommy was so Autistic, and thus, was so fat, and thus, was so weak, was because vaccines contained mercury compounds in them, and even Tommy's vaccine promoting biology and chemistry books told how mercury was a highly toxic element that cause brain damage, hence, Tommy's autism. Tommy, like the effeminate shadow of a man he was, acted like a little bitch, talking how much he "learned" in school and he was credited because he was the creator of ShadowXBloodFangTheHedgehog76. Tommy would cite his "mommy" on how Jacob was only safe because of a concept called "herd immunity," completely unaware of the yiddish dog whistle term for goyim, as he explained that people like himself served as human shields for Jacob. But Jacob pointed out the obvious, why was Tommy so malformed, why doesn't Tommy and his peers understand what really happened on 9/11, why does Tommy and his peers allow globalists to rape his country and financially ruin him, why do the globalists push GMOS and weaken his masculinity with feminist ideas. Tommy was stumped, but he ignored Jacob and continued flailing about like a moron due to his autism. Jacob, while not particular successful, had learned essential survival skills like crop gardening, and food preparation, on top of learning many exotic instruments from around the world in his quest to challenge the NWO, the ZOG, while protecting his race.

Tommy became an internet mockery, went no where in life, and when the IRS takes his house and videogames away, he'll be in a homeless shelter after some black people rape him to death.

With love from /pol/, never vaccinate your kids, it's not worth it.

Anonymous 17/02/08(Wed)17:42 No. 16457 ID: 8b2816

Brain damage causes autism, now? That's news to me.

Anonymous 17/02/11(Sat)04:43 No. 16458 ID: a97099

If you live in the USA and attended any school, you were vaccinated. Sorry to burst your bubble, but if your parents said you weren't, they're lying. They don't let un-vaccinated kids attend schools, public or private. That's simple fact.

So you can go ahead and kill yourself because you're a walking contradiction.

Storage madness Anonymous 16/08/31(Wed)10:13 No. 16356 ID: f62a88 [Reply]

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Basically, my file/folder organization is pretty non-existent. EG: pictures folder has like 5 subfolders that make no fucking sense.

TL:DR how do you sort out your shit?
and are many fucks given about filenames

5 posts and 1 image omitted. Click Reply to view.
Anonymous 16/12/12(Mon)07:42 No. 16398 ID: ef54e2

It's me again. I finally set aside some time to look at Hydrus. While its features definitely appeal to me, this is a deal-breaker:
My collection consists not of gigabytes, but of terabytes of files. Literally millions of files in a ZFS array. I simply cannot afford an import operation that performs a full file copy.

Anonymous 17/01/15(Sun)07:04 No. 16411 ID: 4c82ad


I am also tossing my hat in as a guy who had this idea independently. Mine is probably going to be written using the sfml library in c++ though. I guess a lot of us have similar issues :)

Anonymous 17/01/15(Sun)11:04 No. 16412 ID: ef54e2

Hey, I'm ef54e2.

Would you be interested in working as a team on this? I already have a fully functional viewer and a PoC client/browser for the database, and a server. You can browse a virtual directory structure and open files with the image viewer. The server sends the file contents to the viewer through a socket (entire file resides in the client's memory; streaming is WIP) using a custom protocol.

You can take a look at the viewer code: https://github.com/Helios-vmg/Borderless
The server and browser code is private for now, but I'd be willing to share it with someone interested in working on it, of course. The client and server are written in C# (the server binary can run unmodified on both Windows and Linux) and the database is PostgreSQL.

Let me know, man. I really want to get this done, but my time is divided between my day job, real life, and other projects, so I can never find the time to work on this.

Anonymous 17/01/30(Mon)01:55 No. 16444 ID: b46211 [Reply]

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Hello there /sci/. I have a challenge for you. Take your favorite futuristic or otherwise out of reach tech from any movie (let's say a light saber) and try to explain if humans can replicate it with a few modifications.

Fast Oohplah 17/02/01(Wed)17:28 No. 16447 ID: 4318e8 [Reply]

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Hey /sci/, how fast would an object need to travel in a circle to look like one solid ring or object. Like if a red ball span so fast it just looked like a solid red ring, not moving at all. How fast is that?

>pic unrelated

Anonymous 17/02/01(Wed)21:19 No. 16448 ID: 8b2816

It depends on the detector that is doing the looking and the specific physical medium that is being used to "look".
Compared to a ring that is not moving, an object that's orbiting tremendously fast must be under a lot of acceleration, and should therefore be producing heat and some IR radiation.

Fogel Fry 17/02/01(Wed)23:23 No. 16449 ID: 6d05e5

Just for strictly non-serious reasons: How fast needs the red ball to travel to dupe the human eye and what would this do to the material the ball is made of?

Coming to that: What material needs the red ball to be made of?

Anonymous 17/02/02(Thu)00:40 No. 16450 ID: 8b2816

It depends on the sort of light that shines on the object. For example, strobe lights are used to visually inspect propellers as they spin in water. If you can time a light to shine very briefly at the same frequency as the object orbits, it will appear to be at a standstill in it regular, non-ring-like form.

Assuming a constant light source, such as the sun, and that the observer is not moving their eyes (because fast-moving objects are visible during saccadic motion), an orbit of a few centimeters in radius would appear as a solid ring rather easily. I would guess at less than 200 Hz (<12 kRPM). Roughly speaking, the larger the radius, the faster it must spin; more specifically, the tangential velocity must stay the same. Additionally, if the orbit is looked at from the side, the object will appear to move slower when it's on the far side of the orbit, so it will need to move even faster than if the orbit is looked at from the axis of rotation. The crucial factor here is how quickly the object traverses the field of view of the observer.

Anonymous 17/01/16(Mon)06:55 No. 16414 ID: 57a468 [Reply]

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A mental health question for armchair psychiatrists.

Gender dysphoria is a mental health disorder as described in the DSM-5 as someone who identifies as something other than their assigned biological sex. Given that psychiatry still follows the scientific method as to making decisions over what is and isn't a mental disorder. There are still legitimate causes of such individuals.

My question is targeted toward those individuals who somehow manged to turn 'being transgender' into a trend. While they haven't done much to really affect the lives of others unless the lives of others are affected by whining and bitching about their lives on Tumblr without, as they say, checking their privileges. I want to know what a proper diagnosis would be for certain transtrending social justice warriors who encourage violence.

From what I read, gender dysphoria is a fairly weak disorder that most likely isn't the culprit of such extremism. So is it possible that schizophrenia or another such disorder may also be effecting said people? While I do believe a few of them may legitimately be transgender who only seek to find a voice and somehow end up falling into a bad group. There are still a majority of them that make me question their beliefs.

I probably should be asking these questions on a psychiatry forum instead of a chan website, but whatever, I anticipate some negativity.

18 posts omitted. Click Reply to view.
Anonymous 17/01/28(Sat)00:38 No. 16443 ID: 8b2816

>You do know that one contributing factor to the high suicide rates is prejudice, right?
The world is what it is. A treatment has to work in reality to be effective, not hope that reality will change to accommodate it. Saying "gender reassignment is only unsuccessful because people are prejudiced" is like saying "incineration would work wonders against AIDS if only people were fire-proof".

Anonymous 17/02/01(Wed)06:53 No. 16445 ID: 57a468

Noticed how I said it was only one factor. You appeared to have missed this part. Also, a society that doesn't change is due to extinction. One cannot keep things the way they are if life moves forward not backward. Why do you think there is so much controversy concerning Trump's administration?

This still doesn't change the fact you're ignoring the basis of science by saying shit like the DSM is unreliable or that there should be a better treatment without providing hard evidence to support such statements.

Anonymous 17/02/01(Wed)08:29 No. 16446 ID: ef54e2

>Noticed how I said it was only one factor. You appeared to have missed this part.
You only named one factor, so I only responded to one factor.

>Also, a society that doesn't change is due to extinction.
Society changes. There's no avoiding that. That doesn't mean it will change in a particular direction.

But, for the sake of argument let's suppose that in 100 years there is no progress of any kind in gender dysmorphia treatments and transgenders are universally accepted as being of the gender they purport to be, to the point that women have no dating preference between men and transsexual men, beyond reproductive capability. In other words, the situation is the same as today, only with total acceptance. Furthermore, this acceptance has caused transgender people to be statistically indistinguishable from the general population in pretty much all ways.

This hypothetical future doesn't change the fact that today the treatment is unsuccessful in many cases and that it's worthwhile to research new forms of treatment. If you disagree with this then I'm sorry, but the one who's resistant to change and progress is you.

>you're ignoring the basis of science by saying [...] that there should be a better treatment without providing hard evidence
I don't quite follow. I need to provide evidence for the statement "there should be a better treatment"? It's an opinion. Are you saying you do not believe I hold that opinion, or are you saying that you disagree with that opinion? Tough titty either way.

SSID ideas BillyJoeThePianoMan!!HjBTVkMQpk 15/09/29(Tue)00:57 No. 16202 ID: 8aea60 [Reply]

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/sci/ give me some "edgy" SSID ideas, I can have up to four or five on my WRT54Gv5 with DD-WRT. I also figured out I can up the power to about 1.6 watts, but cannot get the -o command to turn on "override" where you can set basically any Tx power. Also I can use channel 12 13 and 14 freely :)

Other than SSID ideas that are "edgy" can you think of any illegal (in the US in general or wherever) SSIDs? Just for lulz.

5 posts omitted. Click Reply to view.
Anonymous 16/11/03(Thu)04:06 No. 16375 ID: c58625

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the social security numbers of your enemies.

Anonymous 17/01/18(Wed)17:47 No. 16419 ID: 3bc715

Try "OsamaIsKing" or "DatKiddieArse"
Pretty edgy if you ask me.

Anonymous 17/01/27(Fri)22:12 No. 16442 ID: 94abdf

Dont use channels so close to each other (eg 12, 13, 14), you will suffer the wifi gods wrath.

PedoFinderGeneral pedospotter 16/08/17(Wed)09:10 No. 16351 ID: e75e2a [Reply]

File 147141784023.jpg - (2.43KB , 135x90 , magic.jpg )

shouldn't all pedos go jail soon?


dont pedos ever wonder how come
other pedos know all about them
despite they all use winrar?

that its strange they break
eachothers security with
the most basic knowledge

do you think pedos will
ever realise its not really
scientifically accurate
Message too long. Click here to view the full text.

Anonymous 17/01/25(Wed)19:31 No. 16436 ID: 3bc715

Never met a kiddy pickle tickler myself, but from what I can gather, some of them get caught due to extreme arrogance.
(i.e: "Those policemen won't get me, I USE A LIBRARY COMPUTER!")

Earth Hole Anonymous 17/01/05(Thu)16:26 No. 16406 ID: 4318e8 [Reply]

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Hello /sci/. If there was a giant hole in the earth leading from one end to the other and- if you jumped in- would you just be pulled to the other side, or just be trapped in the middle by gravity?
>Pic unrelated

1 post omitted. Click Reply to view.
Anonymous 17/01/09(Mon)15:12 No. 16409 ID: 4318e8


Anonymous 17/01/15(Sun)07:00 No. 16410 ID: 4c82ad

Gravity is actually the force of all bodies in the universe pulling on all other bodies in the universe. However, the strength of the pull weakens with the square of the distance between two given bodies. Since the celestial bodies in the universe are so far apart, you can say for conveniences sake that you are only under the effect of the gravity of the nearest one (the earth).; in reality though, you are even (very, very weakly) being pulled towards other people, which means that the "your momma" joke about her having a gravitational pull is technically true.

Anonymous 17/01/22(Sun)03:50 No. 16427 ID: ed8b6e

You would lose energy and slowly oscillate and then come to a stop at the center.

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