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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
15270

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:

http://ebookee.org/index.php?tag=7

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.


11 posts and 2 images omitted. Click Reply to view.
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757125 Inline skating lingpsv 15/01/04(Sun)00:11 No. 16018 ID: a90d21




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

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


>>
Anonymous 15/03/06(Fri)05:04 No. 16066 ID: d2ef46

I'm not a computer scientist, but I imagine that like any career, you've got to pick between excelling at what you do and devoting time to your family.

If you ask me I say scrap the computer science stuff and go for a trade skill, but that's getting away from the board/thread topic.




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

File 14144459653.jpg - (220.71KB , 791x1024 , pornography-791x1024.jpg )

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?


4 posts omitted. Click Reply to view.
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Anonymous 15/01/12(Mon)18:27 No. 16025 ID: dfd97c

>>15951

This, however TV, video games, and other "artificial" stimuli do not have the strength of pornography which sets your natural tendency to mate on overdrive.

This is explored in-depth in this website: http://yourbrainonporn.com


>>
Anonymous 15/03/01(Sun)02:27 No. 16063 ID: 4ffd69

>>16025

I would argue that video games are FAR more addictive than porn.


>>
Anonymous 15/03/03(Tue)03:26 No. 16064 ID: 48378a

>>16063
What if I fap to video games?!?




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

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?


4 posts omitted. Click Reply to view.
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Anonymous 15/02/27(Fri)08:32 No. 16060 ID: d2ef46

So now the thread's getting into culture vs. instinct and I have no idea what >>16042 is talking about.

Great science thread, 10/10


>>
Anonymous 15/02/28(Sat)06:05 No. 16061 ID: f6b29d
16061

File 142509992517.jpg - (202.58KB , 750x427 , 142320727597.jpg )

Don't get me started on responsible water use as a natural resource.


>>
Anonymous 15/02/28(Sat)18:12 No. 16062 ID: 8bfb21

>>16061
I know it's possible to use water in ways like that, but that image is actually possible?




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

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

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


35 posts and 3 images omitted. Click Reply to view.
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Anonymous 15/01/08(Thu)20:36 No. 16022 ID: a14362

Neither, use GNU/linux of you want to get some serious work done.


>>
Anonymous 15/02/13(Fri)22:25 No. 16054 ID: b5f3ce

>>16009

Ahah. What? That's like saying on average all Ferrari owners earn $50000 more a year than your Ford ford.

>Not getting basic statistics, posting on /sci/.


>>
Anonymous 15/02/15(Sun)05:56 No. 16055 ID: d2ef46

>>16009
I can't seem to find a citation on that.
>>16010
Or that.

But I did find plenty of articles saying that (according to consumer research by Orbitz) most Mac users are willing to pay more for the same shit, given a choice between a higher price for the thing and a lower price for the thing.




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

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.


>>
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.




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

File 14014830663.jpg - (100.20KB , 238x579 , rs.jpg )

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.


23 posts and 4 images omitted. Click Reply to view.
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Anonymous 15/02/09(Mon)18:41 No. 16050 ID: e3615c

>>16047
Yes, if we were measuring kilometers in the order of 10000, not in the order of 2^319. 1e-13 % of 2^319 km is over 1e+55 observable universes.


>>
Anonymous 15/02/09(Mon)20:07 No. 16051 ID: 58e797

>>16050
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:
http://spacecollective.org/TheUndying/5970/Big-numbers-and-the-human-mind


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

>>16051
>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.




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

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/.


4 posts and 1 image omitted. Click Reply to view.
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Anonymous 14/12/30(Tue)20:57 No. 16013 ID: 465a65

>>16006

They can't see each other's colors, but they could detect the flip. If the left one's head-on profile looks like *-**-- to other Flatlanders, the right one would be --**-*.


>>
Anonymous 15/01/03(Sat)08:11 No. 16017 ID: 9ec05e

>>16013
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.

http://en.wikipedia.org/wiki/Non-orientable_wormhole




Anonymous 15/01/17(Sat)18:16 No. 16028 ID: 36bbdb [Reply]
16028

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Kay guys. Not sure if I should post this here or in Tech Support but I need some basic tech assistance, nothing is borked. I bought a Windows phone and I'm disgusted with its obsession on finding my location and harvesting my data, often without my permission. When I tell apps and programs they can't use GPS to stalk me or gather my data, they refuse to work--even though the functions they perform are not reliant on positioning.

What can I use to keep the phone from being a little Big Brother all the time? I'm not worried about the gubbermint, they are welcome to my porn and terrifying Internet history. I just hate being advertised to and watched by corporations everywhere I go. Are there any add-ons I can use to make the phone more secure/more resilient to casual data trawling?

I'll take this to tech-help if I have to, but I wanted to ask you chaps first. Thanks in advance.


>>
Anonymous 15/01/17(Sat)18:17 No. 16029 ID: ab9f96

I have a windows phone and it rarely does this. Mostly because I don't have any apps.

solution? Use phone for text/calls only and turn off data. gj




A nice initiative Anonymous 15/01/09(Fri)20:44 No. 16024 ID: c7d0c5 [Reply]
16024

File 142083267722.jpg - (8.75KB , 100x100 , 7moon.jpg )

It's nice that this emerging site tries to introduce progressively the mathematics and the science at the people.
http://www.magikbit.com/english/mathematics/mathematics.php
we hope that they follow other chapters, as they promise on their home page.




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