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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.

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

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.

18 posts and 4 images omitted. Click Reply to view.
Anonymous 15/01/27(Tue)06:16 No. 16034 ID: 94a3cd

I'm perfectly ok with floating point for something like that, but if that's so then you wouldn't right it out with all the zeros or say "x^319 is:
because they certainly are not equal...

Anonymous 15/01/27(Tue)06:17 No. 16035 ID: 94a3cd

Also my code took 5 minutes to type up and .5 seconds to execute. Not really a waste

Anonymous 15/01/27(Tue)16:25 No. 16037 ID: fef7f2

>they certainly are not equal...
They are the same within a 0.0000000000001% margin of error.

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

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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

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?

2 posts omitted. Click Reply to view.
Anonymous 14/11/20(Thu)02:18 No. 15972 ID: 7142e2

do you know what the neural level of the brain entails? If you did that would answer your question ; answer = no, not really

Anonymous 15/01/07(Wed)09:24 No. 16021 ID: add1bb

Try to go a week without porn and see if you are addicted.

Anonymous 15/01/12(Mon)18:27 No. 16025 ID: dfd97c


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

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

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

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

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

33 posts and 3 images omitted. Click Reply to view.
Anonymous 14/12/25(Thu)06:44 No. 16009 ID: 54104e


Mac users earn an average $10,000/year more than PC users. So either being stupid makes you rich, or Mac users know something that PC users don't.

Anonymous 14/12/25(Thu)15:11 No. 16010 ID: eb22c2

>Mac users earn an average $10,000/year more than PC users.
Mac users are on average 27% deeper into debt than PC users.
So either being stupid makes you spend your money on stupid shit, or Mac users are getting ripped off...

Anonymous 15/01/08(Thu)20:36 No. 16022 ID: a14362

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

how to make airplane Anonymous 15/01/04(Sun)17:37 No. 16019 ID: 61d208 [Reply]

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

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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/.

3 posts omitted. Click Reply to view.
Anonymous 14/12/22(Mon)05:04 No. 16006 ID: 789203

File 141922108454.png - (898B , 369x267 , flatlander.png )

If the rotation is non-instantaneous, then that means the universe is 4-dimensional or higher, which in turn means that the laws of physics would take this into account. For example, perhaps stereoisomers can maintain their properties across 4-rotations because they had characteristics that lie outside our 3-space all along, and we just weren't able to perceive them.
For example, imagine that this is what the flatlanders look like. Note that they can't see each other's colors. If you were to take one and rotate him like OP described, other flatlanders would be unable to tell if he was mirrored or rotated, but you would. Stereoisomers would probably behave like this in this hypothetical scenario.

If the rotation is instantaneous, then there isn't really anything that can be concluded.

Anonymous 14/12/30(Tue)20:57 No. 16013 ID: 465a65


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

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.

Nokia Cutter 14/09/30(Tue)10:08 No. 15900 ID: 91d0e5 [Reply]

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Is it even possible to get an old Nokia phone on a modern service provider ? I realized that I never use my iPhone for calling so it would just be better to get an iPod and a different phone. What do you guys think ?

Anonymous 14/10/07(Tue)03:51 No. 15916 ID: 1d75bc

If you mean using an old Nokia on a modern providers network?
Then YES. Plenty of networks still run 2G (GSM/GPRS/EDGE) channels for backwards compatibility and emergency dispatch services until 2016 (US) and 2017 (UK). Though reception can be patchy.

If you mean getting an old Nokia on a new service plan... oh wow.... seriously?

Realistically you're best off holding off a couple of months for the Nokia 3310 - Pureview as it hold to it's namesake for quality but with 3G which'll keep it going into 2030.

Anonymous 15/01/03(Sat)06:42 No. 16016 ID: 5733b2

I don't know, but I know what you mean. I had a original Motorola razor and it did everything I wanted very well and nothing else. Used it for 9 1/2 years before it gave a Kernel Panic error which nobody even tried to fix.

There is something to be said for do one thing well devices vs the do everything badly stuff we have now.

Cryptoforums.net Technology Forum Cryptoforums.net Technology Forum 14/05/13(Tue)10:25 No. 15656 ID: 288b60 [Reply]

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Hello chans of the internet. We at https://cryptoforums.net have created a MyBB forum dedicated to the discussion of things like Bitcoin, Privacy, Security, Cryptography, GNU/Linux, Philosophy, Politics, Freedom, Cryptocurrency, Hacking and many other general subjects. We are currently in our early stages and we want to invite more members. If you like any of those subjects you should come check us out! We also respect anyone's opinion even if negative so give us all your positive/negative support/criticism!

8 posts omitted. Click Reply to view.
Anonymous 14/08/11(Mon)18:38 No. 15815 ID: d9f5aa

the joke's getting old, shillfag.

OP your forum would be a lot more appealing if it didn't require an email.
trashmail makes it easy but waiting for the email to arrive is a fucking dealbraker.
I'd probably rather enter a fucking google recaptcha and have my everchanging dynamic IP logged by some useless waste-of-money agency than wait for a shitty activation mail (and possibly still get logged if my ISP or trashmail provider is sharing data as much as google does).

Anonymous 14/08/11(Mon)18:39 No. 15816 ID: d9f5aa

>>15662, not 199869 obv.

Registration requires captcha, but none displayed for me Anonymous 15/01/02(Fri)05:55 No. 16015 ID: 226b1d

I've tried to register on cryptoforums three times tonight, using Opera, FireFox, and IE. In all three browsers, I agree to the terms, populate the fields, and submit the form, to be greeted with:

Please correct the following errors before continuing:
•The image verification code that you entered was incorrect. Please enter the code exactly how it appears in the image.

There is no captcha image to enter. There's a question to answer, which I answered correctly each time.

Is the new user registration broken, or am I the only one having this issue?

Also, your Contact Us mailto link is broken. It contains no email address. Ergo, I could find no way to reach a site administrator, hence the post here.


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