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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 14/11/22(Sat)00:15 No. 15973 ID: 7fa0bd [Reply]

File 141661174892.jpg - (104.70KB , 640x360 , portal dalek.jpg )


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

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?

PlutoniumBoss!Y1SVQJ54eA 14/10/28(Tue)08:42 No. 15951 ID: 465a65

Almost any stimulus can potentially become linked to a dopamine response and become addicting, really. And too much constant dopamine wears down your receptors. So yes, overindulgence in pornography can do this, but so can overindulgence in television, video games, or anything else.

Anonymous 14/10/28(Tue)12:51 No. 15952 ID: 4321f6

It's commonly known that pornography can be addicting, but besides from the addictive side of it does it come with other negative side effects on a neurological level?

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 14/10/19(Sun)11:15 No. 15940 ID: e9758b [Reply]

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How much money you reckon ebola raised for in the name of science? thanks little fella!

2 posts omitted. Click Reply to view.
Anonymous 14/10/27(Mon)03:12 No. 15947 ID: ef4f14

File 141437592088.jpg - (43.46KB , 526x935 , 1017745_10201745506398614_5403660446865663442_n.jpg )

I know a company in Chicago that manufactures medical equipment, suddenly found itself with a massive backlog, starts hiring literally anyone with machining experience, right off the street. I've been not unemployed for two weeks now thanks to our little buddies.

Woo. 14/11/01(Sat)16:07 No. 15959 ID: 2429da

File 141485445093.jpg - (95.39KB , 945x552 , ebola-body-bag.jpg )

Thank you, little buddies! :D

Anonymous 14/11/18(Tue)05:41 No. 15971 ID: a4fae5

>that one laughing nigger in the middle

Sifted 14/09/26(Fri)02:55 No. 15892 ID: 96405d [Reply]

File 141169293046.jpg - (43.01KB , 290x399 , J8seKRxKdk6RNCK6ipzejQ2.jpg )

So for everyone out there I ask you what you think the universe would be like if attraction was different. If it was likes attract and opposites repulese, so two positive charges attract same with negative and then a positive and negative repulse. What do you all think?

1 post omitted. Click Reply to view.
Sifted 14/09/26(Fri)06:02 No. 15896 ID: 96405d

I realized for the most part it would be the same but I meant like the stuff like black holes. Instead you would get a negatively charged or positevly charged one and instead of becoming a string you would lose all the electrons or protons in your body instantly. That would be insane if its the proton one you would just disappear the electron black hole would create a nova burst of energy. That would be insane.

Anonymous 14/09/26(Fri)19:30 No. 15899 ID: 801f00

Atoms wouldn't bind the same at all, compounds would be very different. Humans as we know them wouldn't exist. Chemistry as we know it wouldn't exist. Everything would be different

Anonymous 14/11/15(Sat)12:22 No. 15970 ID: c4fc35

My guess would be not much change at all in terms of how the universe works, entropy etc.

But would we exist in it? Probably not.

Effectively you are just switching the masses of electrons and protons. The atomic structure would remain relatively similar except for heavier electrons. Would this cause them to orbit much further from the nucleus? I don't know I'm not a physicist.

But yea, if atoms functioned similarly to how they do now then organic life would be very different. Depending on the properties of the new elements it would likely not be carbon based but rather a more suitable element

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?

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Anonymous 14/10/28(Tue)15:14 No. 15953 ID: b2989d

why are you even considering apple

Anonymous 14/11/07(Fri)11:37 No. 15964 ID: 5e04a1

Your post sounds like an advert for Apple shit. Why does everyone who buys one of their overpriced, shitty products get indoctrinated into the Cult of Apple? It's as if wasting so much money flips a switch in their head and they have to justify the loss by any explanation.

I would rather carve a computer out of wood and melt sand into chips with my bare hands than buy that garbage, it would make me less of a faggot too and that's always a plus.

Not kidding, buying a mac means you're more likely to be homosexual. I'd have a link to the study but Encyclopedia Dramatica is down. Using Linux makes you more likely to be autistic (no surprises there).

Nattajerk 14/11/10(Mon)22:51 No. 15968 ID: 8a2823

That's nice, but saying something positive doesn't make it an advertisement.

Parabolas in autodesk inventor Anonymous 14/11/04(Tue)17:45 No. 15963 ID: b2989d [Reply]

File 141511955922.png - (2.77KB , 197x256 , parabola.png )

I need to create a parabola in autodesk inventor for a school assignment, and the parabola needs to be shaped like the bottom of a circle (kind of like a lid) what do?

Anonymous 14/11/08(Sat)09:40 No. 15965 ID: 789203

>the parabola needs to be shaped like the bottom of a circle
Well, that's not a parabola then, is it? It's an arc.
arc(x, h, v) = (v / h) * sqrt(h^2 - x^2)
h being the radius of the horizontal elliptical axis, and v the same of the vertical one.

America VS the metric system Anonymous 11/11/28(Mon)22:57 No. 12847 ID: 2dcfee [Reply] [First 100 posts] [Last 50 posts]

File 132251746298.jpg - (33.63KB , 400x308 , FAT AMERICAN.jpg )

It’s hard to find comedy gold like this, however this is priceless


Apparently a true American tries to show the failures of this evil satanic scientific metric system and fails horribly.

Best parts:

1) Arguing that centimeters are not part of the metric system!
>"Centimeters, while in common usage, are NOT officially recognized metric units"

2) Actually trying to measure something using 0.1 mm obviously not understanding that this precision is not actually possible with human hands.
>"In metric notation this would be 1219.2mm by 2438.4mm."

123 posts and 10 images omitted. Click Reply to view.
Anonymous 14/02/12(Wed)03:58 No. 15537 ID: 44326e

This attitude is why we're still stuck in the past.

Anonymous 14/03/14(Fri)04:09 No. 15592 ID: 1615b6

this attitude cost mankind one satellite. good job.

Anonymous 14/03/16(Sun)07:12 No. 15596 ID: b6dcec

And this attitude is why he won't be working with a great many people in his own country.

Enjoy your exciting job in retail, OP.

Anonymous 14/07/25(Fri)22:51 No. 15766 ID: 86e709 [Reply]

Youtube - Toggle Video
  Everything I've read about Eugenics has been about how it's pseudoscience. Ok. but, by the sound of it, it was just a selective breeding program. If artificial selection works in every other species, and natural/artificial selection has produced us, ...where's the problem exactly? I have yet to see how a sophisticated selective breeding program couldn't produce a better human body or brain or both. It's what we do every time we pick a mate who we think will make us some primo offspring.

pic semi-related: Just try listening to this without clawing your eyeballs out (why are so many people so fucking retarded and how can we replace them with upgraded models?)

4 posts omitted. Click Reply to view.
Anonymous 14/10/27(Mon)03:27 No. 15949 ID: ef4f14

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Natural selection is all about people deciding for themselves who they reproduce with. This prevents unattractive people from reproducing. This makes it very hard for fat American women with entitlement complex to breed, eventually they will be extinct.

Eugenics is all about some arbitrary group of people deciding who you are are are not allowed to breed with. Ideally, this could be used to breed unfit people out of the gene pool a lot faster, but who are these people that decide who is unfit?

Right now, the people most likely to implement a eugenics program in the western world, are the SJWs that want fat American women with entitlement complexes to breed like rabbits, and everyone who questions the socil order, to be castrated. There is no such thing as a eugenics program that does not fundamentally violate someones basic human rights.

Anonymous 14/10/28(Tue)20:35 No. 15955 ID: ab4c09


I'm the anon who wrote >>15925 this and, as a side note, I ONLY listen to electronic music. I forgot to respond to that part of your post when I wrote my answer. Although I don't listen to Mark Sherry (I'm not a fan of tech trance for the most part) I like melodic progressive house and trance. Like Benz and MD and Digital Witchcraft to name a couple of good groups. I also like deep house sometimes and occasionally a smattering of drum and bass and psychedelic trance (or goa trance, whatever you want to call it).

Anonymous 14/10/31(Fri)19:26 No. 15956 ID: 2f260d

>Natural selection is all about people deciding for themselves who they reproduce with. This prevents unattractive people from reproducing.

Theoretically, yes. However, society has become a larger influence on breeding than any sort of biologic mechanism as fitness or attractiveness. A person with high wealth or social status can have as many children as their bodies can put out if they want to. In practice, it's the stupid people who are breeding most, where they are then taken care of by the goodness of society. Capitalism results in a world of vapid pretty boys/girls with no physical or mental strength whatsoever who suck on the corporate tit all day. Communism results in a world of ugly, dirty folks with strong arms and three brain cells to their name who work themselves to death. Either way, they are ruled by inbred fools who were born in the throne and honestly believe that success is just who you ARE, not something to be attained.

Pick your favorite kind of Hell. It is not possible for anything to fix it.

Anonymous 14/10/12(Sun)19:00 No. 15929 ID: b20a90 [Reply]

File 141313325435.png - (193.71KB , 450x450 , BT clients.png )

Hello /sci/!

Does anyone please know of a program that can analyze torrents? What I want it to do is to create a printout of all the files in the torrent. I also want to make comparisions of torrents; to see if two torrents have files with the same name and/or the same hash value.

Anonymous 14/10/16(Thu)11:00 No. 15936 ID: 789203

Yes, dumptorrent.

Hashes are computed per-block, not per-file. Meaning, the hashes a torrent contains will depend not just on its particular contents, but also the particular order in which they appear, and the block size that was used. It's very unlikely that two distinct torrents containing the same file will also share any hashes, even if the block sizes are the same. It's even less likely if the file in question is smaller than twice the block size.

Let n be the absolute offset of the file on the torrent A (given by the sum of all the file sizes that came before), and let m be the same on B, if file_size >= block_size * 2 and n is congruent to m modulo block_size, then there will be at least one duplicate hash between the two torrents. For randomly constructed torrents (a reasonable situation) with a random file_size the probability of the congruency condition being met is of 1/block_size. So for block_size = 4 MiB (a common block size), the probability is lower than four million to 1.

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