-  [WT]  [PS]  [Home] [Manage]

  1.   (new thread)
  2.   Help
  3. (for post and file deletion)
/sci/ - Science, Technology, Engineering, and Mathematics

Join us in IRC!

•This is not /b/ or /halp/. Tech support has its own board.
•If you are not contributing directly to a thread, sage your post.
•Keep the flaming at a minimum.
•Tripcodes⁄Namefags are not only tolerated here, they are encouraged.
•We are here to discuss sci-tech, not pseudoscience. Do not post off-topic.

•♥ Integris

  • Supported file types are: GIF, JPG, PNG, WEBM
  • Maximum file size allowed is 5120 KB.
  • Images greater than 200x200 pixels will be thumbnailed.
  • Currently 502 unique user posts. View catalog

  • Blotter updated: 2011-01-12 Show/Hide Show All

Movies & TV 24/7 via Channel7: Web Player, .m3u file. Music via Radio7: Web Player, .m3u file.

WebM support has been added on a trial basis.UPDATE: 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.

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 )


2 posts omitted. Click Reply to view.
Anonymous 14/11/22(Sat)23:44 No. 15980 ID: 5d199c

To me they look like portable life-support/coffins. Picture some 112 year old codger wrinkled up inside one guiding it round akin to a spaz marin dreadnought. That way the expired can enjoy 'normal' life well past their expectancy.

Anonymous 14/11/24(Mon)05:42 No. 15983 ID: c4e26c

So like, a Dalek then.

Anonymous 14/11/26(Wed)20:43 No. 15988 ID: ab4c09


lol ftw.

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?)

6 posts and 1 image omitted. Click Reply to view.
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 14/11/24(Mon)06:35 No. 15986 ID: c4e26c

Eugenics clearly does work, it's just unpopular because of the way it was implemented. ...by force.

A voluntary selective breeding program, where a computer analyses your genome and finds from a wide sperm bank, the best, safest, healthiest, least risky genes to fertilize a females eggs with, is probably inevitable, since we have a rough version of that already.

Anonymous 14/11/25(Tue)16:24 No. 15987 ID: e3615c

I think a better alternative would be like what appears in the movie Gattaca. You take many gamete samples from the future parents and fertilize them in vitro. You keep only the zygotes that meet certain criteria for health (optionally freezing a few in case of miscarriage or some other problem) and you implant one in the mother.

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."

126 posts and 10 images omitted. Click Reply to view.
Anonymous 14/11/22(Sat)16:27 No. 15979 ID: 287212


Are you saying that 3 meters = 9 feet?

Anonymous 14/11/23(Sun)09:48 No. 15981 ID: d2ef46

Why does this thread still exist. Every time I visit this board, it's on the front page, hosting a series of one retarded comment after another.

Just learn both. You assholes sound like those people who think everyone in the world should only speak one language. It's fucking stupid. Could a mod please lock this thread?

Anonymous 14/11/24(Mon)06:20 No. 15985 ID: c4e26c

The construction industry was the source of the backlash when the U.S. tried converting to metric in the 60s. Muh Two Bah Fer!!!

Well, a 2x4 was a convenient size, a 2x6 or 10 was as well. No one wanted to complicate matters. Forward to today, and lumber mfg's have repeatedly shaved so much material off their finished products, those numbers are nominal only. A 2x4 is actually roughly a 1.5x3.5, precision & tolerances depending on mfg's QC.

So these toothless bearded fags are already using screwey numbers... Running an entire project with tens of thousands of calculations made based on this idiocy, and all the fucking trouble it causes when the new guy builds shit based on the wrong sizes, they can live with, but calling a 2x4 what it actually is, a 4x9, 4cmx9cm, BLOWS THEIR FUCKING MINDS.

Further proof Europe sent its most retarded and stubborn inbred hicks to populate this country.

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?

28 posts and 3 images omitted. Click Reply to view.
Nattajerk 14/11/10(Mon)22:51 No. 15968 ID: 8a2823

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

Anonymous 14/11/23(Sun)10:04 No. 15982 ID: d2ef46

I think this is what he's getting at: the way some people treat Apple products as an identity makes it sound a lot like they're advertising the product whenever they talk about it. Seriously, Steve Jobs was one of the best businessmen to ever live. Not much of an innovator, but hell, he could probably sell someone's mortgage to the homeless and still make a profit. Nobody else in history has been able to convince two generations of people in a row to treat a product as an identity. It's fucking insane.

There are a few windows fans who do the same thing, and they're just as annoying about it, but they're far fewer in number it seems.

I know you've probably started class by now, but as a general word of advice for others who are in the same situation, weigh every response in this thread. Take note of the common themes between pro-linux, pro-windows, and pro-apple posts. The one with the straightest story is what you want.

Anonymous 14/11/24(Mon)05:51 No. 15984 ID: c4e26c

When Apple does something big, and it does what it's designed to, I love them for doing it, it's great.

The rest of the time, their conservatism pisses me off so bad I almost hate them. My god the effort they put into their software, just to be able to milk the fucking hardware specs for God damn ever in their product line. Yay for more eficient software & hardware, & bang for the buck, but shyyyyyit, Selling non-upgradable notebooks with 8GB ram & non-retina displays in 2015??? And nice fucking iPad mini update. Same exact model as last years, plus an only half-functional touchID sensor... And still no fucking TV. God dammit.

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?

2 posts omitted. Click Reply to view.
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 14/11/22(Sat)08:38 No. 15977 ID: abc87c

I think this was explored as a mathematical possibility in the early universe when antimatter still outnumbered matter a buttfucktruckload to one, and much weirdness abounded.

I forget what all went down but in short, that shit worked briefly, and then worked itself out. It... went away, OP.

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]

File 141371012595.jpg - (61.35KB , 700x479 , 17775_lores.jpg )

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

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.

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.

Delete post []
Report post