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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

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.

9 posts and 2 images omitted. Click Reply to view.
anon 14/11/08(Sat)17:55 No. 15966 ID: 64d39c


Biology and Diseases of the Ferret, 3rd or 4th Edition

Ferrets, Rabbits, and Rodents: Clinical Medicine and Surgery

Anonymous 14/09/20(Sat)07:30 No. 15881 ID: ea642d [Reply]

File 141119101067.jpg - (5.84KB , 300x168 , aw.jpg )

should i get a mac book pro or a window for computer science?

38 posts and 3 images omitted. Click Reply to view.
Pitoucc 15/03/09(Mon)01:01 No. 16071 ID: 3894fd

Pick whatever platform you are most comportable with. Many people that I study with in CompSci go either way, because the tools are mostly available on all platforms. If you want to be a purist, C#/.NET = windows, Obj-C, Swift = Mac, linux for anything else.

Anonymous 15/03/29(Sun)13:22 No. 16079 ID: 5c3204

mac or a linux computer would work best, but you could use windows.

I'm an astrophysicist

Anonymous 15/04/27(Mon)20:32 No. 16090 ID: 593653

>really hard because of secure boot
Solution turn secure boot off in the BIOS

Anonymous 14/10/27(Mon)22:39 No. 15950 ID: d126e2 [Reply]

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What are the factual negative and positive side effects from watching pornography? I recently did some reading into this and found a lot of articles talking about how the neurons create stronger pathways to the brain from the pleasure reward that comes from watching pornography (much similar to the effects from taking drugs). This can lead to addiction and dependency on this type of stimulus to become aroused. So I come to you /sci, does pornography have a negative effect on the brain?

7 posts omitted. Click Reply to view.
Anonymous 15/03/31(Tue)06:08 No. 16081 ID: da1583

Yes. I'll make the analogy that it is like the video game NHL 2009: fun to play & sort of like real hockey but just not as good as a real game of puck on real ice with 20-30 other fellas enjoying the camaraderie

Anonymous 15/04/16(Thu)11:07 No. 16085 ID: 4182eb

I will say that after a life of prawns everything is visual reward stimulus for me. is that a negative thing? I feel this is debatable. makes for some fucking awkward social situations. especially with cake.

Anonymous 15/04/17(Fri)04:44 No. 16087 ID: 9bb934

I started masturbating to porn at about the age of 11 regularly. The only thing that works for me anymore is my imagination and actually being with a real girl.

Anonymous 13/11/02(Sat)01:29 No. 15407 ID: 5dd374 [Reply]

File 138335215071.jpg - (11.30KB , 380x380 , human body muscles.jpg )

Why is the human body organized the way it is? Why have decisions so centralized? Do you think there is a model for the system of organization that the body uses, relative to political systems in use in the modern world?

8 posts and 1 image omitted. Click Reply to view.
Anonymous 13/12/16(Mon)20:05 No. 15487 ID: 1c2d8f

>relative to political systems in use in the modern world

There's the thing, OP. Modern political systems are inefficient. The last thing I'd want is my body to mock modern politics.

Anonymous 15/03/29(Sun)05:36 No. 16077 ID: ae1ae2

wow, look at me go all those years ago
I sound like a children's education programme presenter...

Anonymous 15/04/16(Thu)11:09 No. 16086 ID: 4182eb

well I could sustain myself by eating money and the souls of children and blacks if my body operated this way.

might be fun

EXTREME SMOOTH Airbus A380 Landing! Anonymous 14/12/18(Thu)01:06 No. 16002 ID: cd6139 [Reply]

File 141886117141.jpg - (1.60MB , 3264x2448 , image.jpg )

EXTREME SMOOTH Airbus A380 Landing! I never see something like this. If you have more videos like this please post them.


Anonymous 15/04/08(Wed)05:19 No. 16083 ID: 380e67

The discussion under it is interesting...

education help Anonymous 15/03/06(Fri)02:12 No. 16065 ID: b80d08 [Reply]

File 142560434327.gif - (1.51MB , 400x223 , idk-what-im-doing.gif )

Hey /sci/ I'm currently looking into an new career choice, I always wanted to do something with math or science, and I'm addicted to computers
My request is if any of you guys are computer engineering or computer engineering tech I would love to get some input on how the career is. For example, if you can be a family man or if you travel too much stuff
like that

2 posts omitted. Click Reply to view.
Anonymous 15/03/09(Mon)19:23 No. 16072 ID: e3615c

To clarify, are you looking at *computer* engineering, or *software* engineering?

Computer engineers design computer hardware; the occupation is sort of like a specialization of electronics engineering. To my knowledge, they aren't in extremely high demand. Depending on where you live, you might not even be able to find a job.

Software engineers design and build software systems.
Computer science is yet another possibility. Computer scientists often occupy at companies the same positions as software engineers, since the training they receive have a lot of overlap. Computer scientists, unlike software engineers, are also trained to do research, and also spend more time learning about the more theoretical aspects of computer science.

Anonymous 15/03/29(Sun)07:45 No. 16078 ID: da1583

Best if you have a gf/wife.. it just makes everything make more sense.. also, if you're an adult, that's the normal thing to do

Anonymous 15/04/02(Thu)08:24 No. 16082 ID: 79e9a1

You don't want to be a family man. Especially if you have children. Having kids is a terrible financial decision.

need calculations without sci notation _kp_ 14/05/30(Fri)22:51 No. 15694 ID: 105678 [Reply]

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Hello Gents & Ladies,

I need to calculate x=2^n
where n goes from 0 to 319 in interval of 1.

I tried MATLAB etc but they all start converting the result to exponential form whereas I need the result to be accurate upto unit position.

Can any wise person suggest a way/software to calculate this ( and preferably do it for all values of n so that I don't have to manually calculate for each) ?

Your time & thoughts are much appreciated.

24 posts and 4 images omitted. Click Reply to view.
Anonymous 15/02/09(Mon)20:07 No. 16051 ID: 58e797

You do know using arbitrarily large numbers is pointless, all you're doing is obscuring any point you're trying to make behind incomprehensibly vague values even the most autistic of us would struggle with. Why not chuck in a googolplex or two while you're at it.

Here's a nice article that should help you understand why using real-world values is more useful when trying to make a point:

Anonymous 15/02/09(Mon)20:36 No. 16052 ID: e3615c

>You do know using arbitrarily large numbers is pointless
The pointlessness is a property of the operation you'll apply to the value, not of the value itself. For example, 1.067993e+96 and 2^319 are not interchangeable if you're going to use them in cryptographic operations.
In particular, OP originally stated,
>I need the result to be accurate upto unit position

>all you're doing is obscuring any point you're trying to make behind incomprehensibly vague values even the most autistic of us would struggle with.
The numbers are so large because someone settled with a 1e-13% error in a 96-digit value. The error is an 81-digit value.

Anonymous 15/03/31(Tue)05:52 No. 16080 ID: da1583

was going to reply to the content of the message but the picture was too distracting, sry

Anonymous 15/02/06(Fri)21:17 No. 16041 ID: 6a51a1 [Reply]

File 142325383210.jpg - (59.00KB , 640x453 , Trim_hedge,_neat_lawn_and_a_bench_-_geograph_org_u.jpg )

We mow our lawns to make them look like they're being grazed on.

In caveman times, long wild grass in a territory would have been a sign that it isn't occupied by grazing animals.

We've evolved to find short, neat grass the most attractive as it signals the presence of herds of grazing animals we can hunt.

What do you think?

8 posts and 1 image omitted. Click Reply to view.
Anonymous 15/03/08(Sun)14:27 No. 16070 ID: b2c2db


mildly shortened grass is usually preferable

there's something nice about being able to sit in grass that one can see any reasonable dangers in that's also long enough to be comfortable to walk on while barefoot

and it requires the minimum of attention of the horticultural practices while also requiring the least rich soil one could think of

public sporting areas that functionally require very short, neat, and tidy grass often attract the kinds of people that would have went for this sort of thing as a symbol of their ability to keep on top of things, and manage things

this is why the rich buy artwork, the frivolous nature of the purpose combined with the ability to explain why something has value on some abstract level that has a degree of sense (the less the better as it demonstrates their persuasion capabilities - and relies on a certain credulous belief based on their charisma in other areas often and reputation) as well as demonstrating their ability to keep on top of numerous things at once is a social notification practice and self-advertisement

Anonymous 15/03/10(Tue)07:03 No. 16073 ID: 4c6193

We mow the lawn because bugs live in tall grass, moron.

Did you have a dad? He should have taught you this shit.

Anonymous 15/03/12(Thu)16:37 No. 16074 ID: b2c2db


actually I've seen plenty of bugs in short grass

Something that's been bugging me. Anonymous 14/12/16(Tue)19:41 No. 15999 ID: 465a65 [Reply]

File 14187553071.gif - (1.81MB , 350x331 , strawberries.gif )

If you flip an asymmetrical two-dimensional Flatlander through the third dimension, his right side will become his left side and vice-versa.

Let's say you did something similar to a person, flipping him through a fourth spatial dimension. The problem with this is that the flip isn't just his body parts. The molecules in his body would be flipped too, and many chemicals have asymmetrical molecules which take on different properties when mirrored.

So taking this into consideration, would this flipped person even be able to continue living? Would his death be immediate or more lingering? What effects could we expect to see? Take me down this rabbit hole, /sci/.

5 posts and 1 image omitted. Click Reply to view.
Anonymous 15/01/03(Sat)08:11 No. 16017 ID: 9ec05e

Yes, but I didn't say they wouldn't be able to see the flip. I said they wouldn't be able to distinguish rotations (indicated by a red guy facing left) from inversions (indicated by a green guy facing left).
Likewise, it might be possible to encounter geometrically different stereoisomers that have the same physical properties because they're 4-rotations of one another.

Anonymous 15/01/30(Fri)23:39 No. 16038 ID: 0c9b56

It's so weird that nobody noticed that this not a new hypothesis.


Anonymous 15/03/08(Sun)06:40 No. 16068 ID: 9ecb4f

Ignoring the implausibility of 2D life forms and their biochemistry and assuming the survivability of being flipped, by which I also assume you mean he's lifted off his plane into the third dimension and placed back, then he will probably die a lingering death. If any of whatever hypothetical mechanisms permit 2D biosynthesis were to be reversed on even 1 axis it would render him unable to receive nutrition and calories from his former food supply. It would be like human astronauts landing on a planet with a biosphere based on right handed chirality. I believe we're left handed on Earth. They would waste away eating the local foods which, with exception perhaps to some non-chiral oils and amino acids, would provide no nutrition and taste odd if they were not in fact completely poisonous.

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

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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.

Anonymous 15/02/07(Sat)04:59 No. 16044 ID: 6a51a1

Racist. Being gay is completely normal.

Anonymous 15/02/09(Mon)17:08 No. 16048 ID: 35ef61

genes are a social constuct

Anonymous 15/02/11(Wed)22:11 No. 16053 ID: b19e9b

I'm a mostly-gay med student myself (and in to neuroscience). The subject is fascinating.

There have been a couple of research papers which show that the endocrine status of the mother during pregnancy affects the physiological and behavioural aspects of the child. These aspects were also found to be different between homo- and heterosexual populations.
So, this makes us question whether the changes in aspects and orientation are caused by the same thing.
Fingers point to prenatal testosterone levels. (Which show an increase when the mother has an atypical endocrine profile).

But there is a ton of variance, and we cannot point to a certain causal link between hormones and orientation.
Just an increased level of prenatal testosterone does not account for all the shades of orientation we see in the Kinsey scale, for example.

And to be rather boring and politically correct, I think "variance" is a better word that "anomaly".

So basically, we just don't know. We have a couple of clues, but the empirical evidence is just not enough.

If you enjoy reading scientific literature, here's a nicely written review on hormones and orientation:

Message too long. Click here to view the full text.

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