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

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WebM is now available sitewide! Please check this thread for more info.

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

File 137740339172.jpg - (401.45KB , 1680x1050 , titanfalsecolor.jpg )

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.

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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.

Anonymous 17/10/21(Sat)13:33 No. 16565 ID: 4cb8c4 [Reply]

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In ancestral times girls about 14 were biologically the best wife material and men appear to have evolved an instinctive preference for them.

Homosexuality, could it be an anomaly in brain developement? Dr. Nick Riviera 15/02/05(Thu)04:59 No. 16039 ID: 8ec688 [Reply]

File 14231087868.png - (64.35KB , 320x307 , Dr__Riviera.png )

Hi guys, to begin I just want to make a couple of things clear.

- This thread is NOT about discrimination of homosexuals.
- This thread is NOT about considering homosexuality as disease.
- This thread is for pure scientific discussion.

Well, let me begin by telling you that I'm a med student and a embriology assistant at my university and I'm not a native english speaker, so you may encounter some grammatical errors in the text, but you'll get the point.
This whole dilemma began two weeks ago, when my brother told my family that he is gay. It was quite a shock, not because of the fact of him being gay but because he doesn't fit the gay man stereotype. He's a big dude, loves sports, bearded, the true definition of what some call "manly man". We accepted him, of course, and I have to say I've never seen him happier.
But after a few days I began to think, was he always gay? Did he decided to be gay? Why now? These questions started lingering in my mind. So I went to talk with my him about it.
He told me that he always has been, for as long as he remembers. Nothing has changed about him, except for his sexuality (for us, not for him haha). So that got me even MORE questions. Why are some gay men that are like extremely feminine? Why are some gay women extremely masculine? Why are gay guys like my brother who don't appear to be gay? Why do some gay people feel like they are traped inside the other genders body and need to get medical treatment (sex change surgery, hormone therapy) and why others don't?And why are there women like that too? Why many species, whose main goal is to survive (actually this is every species main goal, it's literally in our DNA), has certain individuals who are the contrary to this?
So I decided to tackle all these matters from a scientific point of view? What if during the development of the lymbic system (the part of the brain which controles emotions, memory, sexual desire, etc.) something doesn't go as it should?
So after I thought of this I told myself I couldn't be the first one to ask myself these questions. And of course I wasn't in a world with 7 billion people so thanks to the magical power of the internet I managed to get a cool text about the subject. I took some paragraphs which I thought were the most interesting, still I'm leaving the link (please don't take the text as discriminatory, it's merely scientific, it refers to homosexuality as an anomaly in brain developement because seen from a medical point of view it is, still doesn't mean it's moraly wrong).

"..the body and the brain first become sexually differentiated at about the third fetal month. Prior to this age, although genetically male or female, the fetus is physically/sexually-neutral. With the formation of the testes, and the secretion of testicular androgen, target ti Message too long. Click here to view the full text.

19 posts and 1 image omitted. Click Reply to view.
 Rembrandt 16/01/24(Sun)22:52 No. 16275 ID: af6485

In my second post:
>culture affects, and is affect by culture
was supposed to read
>culture affects, and is affected by perception

It was also greentexted there.

Anonymous 16/01/27(Wed)06:48 No. 16276 ID: b41207

You make some very good points. I do not have a great understanding of anatomy or biology as a whole, but I have always believed that the reasons behind a person's personality was genetic (to a point) or atleast heavily affected by it. As you said, society also plays a role in the perception or movement on these actions relating to personality. If you are conditioned by the people and ideals around you to be something else, then you most likely are going to become that. Also pertaining to the environment around someone, and how it effects them: if a gay man for instance was only in contact or even only knew of women (besides himself), then this man would have little idea that he was gay. Perhaps he would not feel whole, or a little voice in the back of his head wanting something different, but the idea of wanting someone different would be little existent. I ocassionaly see posts on other imageboards following the idea "the internet made me gay". Perhaps these people always considered themselves straight (as heterosexual is the norm) and never saw gay porn because the mentality " I'm straight not gay, I don't watch gay porn", and once being exposed, they realised these suppresed or blinded tendencies.

Anonymous 17/10/14(Sat)23:38 No. 16564 ID: 651b88

We do know that gayness has a strong genetic component. Most theorize on the X chromosome while links have been found on 4 and 10. Trans are a different issue. See gayness is just a variant, trans is a genetic DISEASE. Its when you have a Y chromosome and the SRY gene is turned off. This creates masculine women (lesbians) or the SRY gene could be variated and produce little testosteron (i.e gay men and trans) that is why many gay men are feminine because they are just trans but barely and actualy gay men (like your bro) are normal.

Request: Post HD images of technology Anonymous 17/10/08(Sun)00:10 No. 16561 ID: 864454 [Reply]

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Hey guys, I recently started a computer science class in college and my networking teacher who is the head of the IT department wants us to impress him with the best personalization of our desktops.

> inb4 impress him with your computer programming skills as opposed to flashy images

No anons, No. The motto that he always repeats is that it's important to be "all rounded". He's seen lots of autist computer geeks who are geniuses at what they do but are pretty much mediocre/shit at nearly everything else in their life (social skills, organisation of themselves, writing CV's).

I would like to show off images that highlight an interest in tech along with high quality photography; so if I may ask you kindly to post your favorite images

> I would to the other chan but those fags banned me since June of this year and my shitty ISP hasn't renewed my "dynamic" I.P. address for 4 months.

Anonymous 17/10/08(Sun)06:00 No. 16562 ID: 4892a9

File 150743525477.jpg - (1.43MB , 1520x2688 , Zu4e5wX.jpg )

Boy I don't think I'd want to try to teach and be an IT head/director, although depending on the size of admission it could be doable.

Anonymous 17/10/08(Sun)07:07 No. 16563 ID: 012486

> He's seen lots of autist computer geeks who are geniuses at what they do but are pretty much mediocre/shit at nearly everything else in their life (social skills, organisation of themselves, writing CV's).

There's no shame in being a specialist, nor in being a generalist. There's advantages and trade-offs to both approaches, as anyone who works in the field can tell you.
I'd much rather be asocial than spend any more than minimum amount of time worrying about the external appearance of a tool.

Anonymous 15/07/26(Sun)20:15 No. 16178 ID: c84a9c [Reply]

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i just need to upload this somewhere
that fucking bitch tinypic breaks 8000 wide pics

1 post omitted. Click Reply to view.
Anonymous 17/10/04(Wed)06:34 No. 16557 ID: 59a816

Bravo, great pic anon

Anonymous 17/10/04(Wed)08:30 No. 16558 ID: 736d69

Why the fuck is it in Russian using the Arabic alphabet??

Anonymous 17/10/06(Fri)21:13 No. 16560 ID: 33427e

Do you mean the Latin alphabet?

Top 11 Worst Location Data Privacy Breaches aladin 17/10/04(Wed)10:58 No. 16559 ID: 4a193f [Reply]

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Although we think our data is safe, we often give chunks of it away to third parties without the proper knowledge of how that information is stored and used. And we also don’t have a clue about the most important thing of all, how do companies keep our data safe. In most cases, it was discovered that our data isn’t as safe as we thought. Just look at Yahoo, and the company’s two massive data leaks; back in 2013 and, 2014 more than 1.5 billion user accounts were affected by all kinds of personal data being compromised. Users’ real names, passwords, email addresses, dates of birth, and telephone numbers were stolen, making the breach the biggest one in history.

Calculus help? Anonymous 17/09/28(Thu)18:49 No. 16553 ID: ebea66 [Reply]

File 150661734419.jpg - (3.64MB , 4608x3456 , 20170928_124631.jpg )

Hey guys, quick noob math question if I may.. in the picture i posted you see the equation y-1=(-1/2)(x-(-4))

Its then simplified to 2y -2 = -x-4
And then again to 2y+x+2=0

..my question is could someone breakdown the simplifying into steps? Im not sure the process they used to arrive at their final answer

Anonymous 17/09/28(Thu)19:08 No. 16554 ID: ebea66

Oh god the math

Anonymous 17/09/30(Sat)03:24 No. 16555 ID: 012486

y - 1 = (-1/2)(x - (-4))
(y - 1)2 = 2(-1/2)(x - (-4))
2y - 2 = (-2/2)(x - (-4))
2y - 2 = (-1)(x - (-4))
2y - 2 = -x + (-4)
2y - 2 = -x - 4
2y - 2 - (-x - 4) = -x - 4 - (-x - 4)
2y - 2 + x + 4 = 0
2y + x + 2 = 0

scientific surrendur Noble Lass 17/09/17(Sun)22:29 No. 16547 ID: 36394f [Reply]

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what it do fam

1 post and 1 image omitted. Click Reply to view.
Noble Lass 17/09/17(Sun)22:30 No. 16549 ID: 36394f

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Noble Lass 17/09/17(Sun)22:31 No. 16550 ID: 36394f

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hello+again 17/09/28(Thu)00:01 No. 16552 ID: 050801

Do you work to be this poor at interpretation or is it something that runs in your bloodline? WRONG.
Take up archaeology and get some decent psycho therapeutic medication, maybe then you'll be less of a Bitch Lass. Woof.

bank account getting drained from hackers Anonymous 17/07/17(Mon)01:09 No. 16526 ID: 030037 [Reply]

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Theoretically, how fucked up would I be if someone used a keylogger on my machine for a few month and leaked my bank account details (online password, PIN, security questions etc) on the Darkweb?

Not worried at all but I just wonder how good these computer hackers are at clearing accounts. Aren't there limits depending on the level of your account? They definitely can get around I.P alerts when accounts are accessed in different countries.

Anonymous 17/07/17(Mon)22:25 No. 16527 ID: 33427e

How fucked? Well, completely.

But to do any of that they would have to get administrative access on your system, and if they get that kind of control they could just zombify your computer and get a constant revenue stream from you.

Breaking into a computer to get information on a single credit card is not very efficient. Getting into a bigger system to steal information on hundreds of credits cards, now that's more interesting.

Still, if you were to do the following you could be reasonably protected:
1. Put a hardware firewall between your computer and the Internet. Block all incoming and outgoing connections. Disable UPnP.
2. Put an HTTP proxy on the inside the firewall. The firewall should allow the proxy to connect to things outside, but not to open ports.
3. The proxy should block all domains except those of your bank.
4. Your browser should talk to the proxy to connect to the bank.
5. The computer should never leave the network nor should the network ever be reconfigured. (Corollary: that computer can never be used for anything other than connecting to the bank.)
If you do this, in order to get your keystrokes an adversary would have to take control of both your computer and either the firewall, the proxy, or the bank.

Anonymous 17/09/09(Sat)02:30 No. 16544 ID: 8b7ae4

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>how fucked up would I be if someone used a keylogger on my machine for a few month and leaked my bank account details
Fucked harder than a $2 Thai whore spending the night with 20 rapists on cocaine.
>Aren't there limits depending on the level of your account?
Usually, it depends.
>They definitely can get around I.P alerts when accounts are accessed in different countries.
If you're talking about location based monitoring then no. I was once traveling about 1200 miles by car for a vacation across the country and tried to spend like $300 for one item on a credit card and it wouldn't let me.

Anyways, never do online banking. If you want to use Amazon or something, go to the bank and take out like $500 in cash and then load it all onto a gift card at a gas station and just that as the card that you attach to your account and use all fake information accept for your address of course. If the account is ever compromised you'll only be out $500 or less. Do this for everything including PayPal. Also never go through drive-throughs or anywhere that a card could be out of sight, and if you do then pay in cash. I know this sounds like a lot but just don't be fucking lazy and you'll stay safe. Nothing is unhackable but you can certainly make yourself an unappealing target.

TLDR shoot for one egg per basket.

Anonymous 17/09/26(Tue)08:06 No. 16551 ID: fbe3c3

If you're not using some kind of shitty bank, your funds and your credit cards should be insured (to the tune of a couple million, I think) by the FDIC. Should anyone clear your accounts and you can prove it was fraudulent, you'll be able to recover what you have lost. However, the amount of time it will take might still leave you in a difficult position, and it won't fix your credit score.

Wizards Assemble! Anonymous 17/09/04(Mon)13:31 No. 16543 ID: 13985f [Reply]

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Advanced users of GNU/Linux (and I mean advanced), remember to try Source Mage GNU/Linux. True source-based distribution, and (in contrast with Gentoo and Arch) is:
Free from obfuscated and pre-configured code.
Fully committed to GPL, uses only free software (as in freedom) in their main package.
With even the documentation licensed as FDL.
Without 3rd party patches, sensible defaults or masked packages.
Doesn't need obfuscated python libraries, only bash.
No systemd (they've implemented their own init scripts system http://sourcemage.org/Init).
Uses clean dependencies as they came from upstream developers, which by the same provides instant updates.
Can heal broken installs.
Can also use flags.

Do you like Arch Linux's AUR? Do you like Gentoo's portage (or ports-like) package manager? With SMGL's "sorcery" you get all that. Making new spells (package build files) not found in the grimoire (repository of spells) is easy http://sourcemage.org/Spell/Book

Bash hackers welcome! Come and join http://sourcemage.org/

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