-  [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 537 unique user posts. View catalog

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

There's a new /777/ up, it's /selfhelp/ - You're Pathetic, We're Pathetic, We Can Do This! Check it out. Suggest new /777/s here.

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

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.

10 posts and 2 images omitted. Click Reply to view.
Anonymous 15/07/02(Thu)01:17 No. 16168 ID: 7d0760

anyone have "a first course of quality engineering" to download?

Anonymous 15/07/26(Sun)20:15 No. 16178 ID: c84a9c [Reply]

File 143793450731.jpg - (80.44KB , 8000x500 , solarsystem.jpg )

i just need to upload this somewhere
that fucking bitch tinypic breaks 8000 wide pics

So, Pluto isn't a planet. Anonymous 15/07/25(Sat)21:37 No. 16177 ID: b3adbb [Reply]

File 143785303060.jpg - (79.57KB , 1024x1024 , lor_0299148119_0x632_sci_3.jpg )

I've got news for your son.

That or its really good CGI and NASA has pocked our billions of dollars.

Anatomics design YoungDaVinci 15/07/24(Fri)22:11 No. 16175 ID: 9ea0ae [Reply]

File 143776867759.jpg - (8.68KB , 275x183 , hand_3.jpg )

Hi to all engineers and designers which can help me, and I think doctors too.
I'm a guy which wants to design the most near to a reality hand just with wood pieces and syringes as hidraulic bomb.
I want to do this for my own and knowledge and becouse in the future i want to become and ortopedic engineer.

If anyone can help, please post drawings and sketches of the design of the wood and syringe hand.

Anonymous 15/07/25(Sat)06:35 No. 16176 ID: ca3ceb

I just drew up some sketches and plans for the hand but decided to patent it for myself.

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

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.

8 posts and 1 image omitted. Click Reply to view.
Anonymous 15/05/21(Thu)22:06 No. 16114 ID: 77222f

disregarding all the social implications and connotations behind the word "normal", being gay isn't "normal" as it relates to a minority population.
Same with being blond-haired, or left-handed.

Of course, when used in non-scientific language (such as drawing a parallel with Down "Sindrome"), it is easily read with all the negative connotations included.

Anonymous 15/07/13(Mon)19:18 No. 16173 ID: 1bf875

Mods, a question: why was >>16111 banned?

Anonymous 15/07/15(Wed)04:35 No. 16174 ID: b2c2db

why were they banned?
>This thread is NOT about considering homosexuality as disease

anyways from what I understand the best way to explain "normal" is difficult to consider, technically understanding the term relies on a fiction or on altering the makeup of what one is considering as a group, for instance if I said normal people had 2 arms and 2 legs one could get into philosophical discussions about amputees but what about people born with congenital issues

is homosexuality similar to the latter there?

then there's the qualifiers of what one considers normal, does it have to be exactly the same things? what does one consider in "the norm"? skin colour? particular noses? certain dispositions towards attaining wealth? these sorts of things are already used by some people to discriminate against others but the base premise might not be appropriate, skin colour might lead to certain differentiations in behaviour indirectly through how one relates to sun exposure, such as putting on sunscreen or staying out of the sun mostly or wearing a hat vs not doing those things

in an election what is the norm? if you look at the largest group of individuals often it's the non-voting but able to group, and then next up is either the unable to vote so doesn't or the voting for the most popular candidate/party group

in this case, normalcy relates to the lack of an action but in the context of an election still leaves out political viewpoints, the non-voters may have completely opposite views and are only similar in that single respect

we know that on some fundamental level organization of the human brain is not a binary thing, physical reality can be represented symbolically by binary expressions of logical arguments and concepts, homosexuality versus heterosexuality but what exactly is it that makes homosexuality a thing in the first place? what about trans-sexuals? or hermaphrodites, if you take a gay man who likes hermaphrodites too are they homosexual? if someone is known to have testes where ovaries should be and are otherwise female(transexuals), are they a male for the purposes of sexual attraction? if knowledge of this condition leads to attraction by a man does this make it homosexuality or just a fetish? what about from a woman?

Anonymous 15/06/17(Wed)01:17 No. 16131 ID: f0a18c [Reply]

File 143449664180.jpg - (36.78KB , 279x401 , Anatomical_Male_Figure_Showing_Heart,_Lungs,_and_M.jpg )

Does anyone know the estimated total length of veins in the human body ? And I'm not looking for that 60K miles trivia shit that counts all the capillaries. I just want the actual veins.

2 posts omitted. Click Reply to view.
Anonymous 15/06/22(Mon)13:13 No. 16145 ID: f5d0cf

>>16144 is right, things we define as postcapillary venules are no different from capillaries except a widening lumen.

Anonymous 15/07/04(Sat)02:27 No. 16170 ID: 325d67

File 143596962555.jpg - (43.99KB , 460x573 , nature fact.jpg )


Anonymous 15/07/11(Sat)11:39 No. 16172 ID: 18b905


At first I was going to say that the first couple of miles of elephants that are still in Earth's atmosphere wouldn't die because they can breathe, but then I remembered gravity is a thing.

And because of gravity, almost all (any of them that don't fall to the moon) of that column of elephants will immediately collapse downward toward the Earth onto those other elephants and then onto the ground in a giant puddle of elephant slop.

Anyway, the distance between the Earth and the moon is 238,900 miles, and the height of an average African elephant is about ten feet. So there are 126,139,200 elephants between the Earth and Moon. Anyway, the point of approximate neutral gravity between them is at 211,266 miles from Earth. Therefore, 111,548,448 of them will fall to Earth. The total weight of all those elephants is about 501,968,016 tons.

Using some questionably accurate ratios of masses of large asteroids related to their volumes, I estimate this huge weight of elephants would be about equal to that of a rocky asteroid of a size of 0.4 cubic kilometers, or about 0.75 km across.

So if the weight of all those elephants somehow compressed into a small dense sphere on the way down and hit the ground at once, it would release enough energy to equal about 16 gigatons of TNT.

Suffice it to say, all those elephants would be dead, seeing how they would be vaporized.

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?

8 posts omitted. Click Reply to view.
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 15/07/04(Sat)03:02 No. 16171 ID: 325d67

There is a ted talk that discusses this topic called The Great Porn Experiment

plane Anonymous 12/11/18(Sun)21:09 No. 14427 ID: fb908a [Reply]

File 135326934614.jpg - (54.35KB , 384x288 , Futuristic_Plane[1].jpg )

Hi /sci/, I'm making a concept of a electric jet. What would you use as a energy storage. It should contain 3 MW/h and weight less then 400 kg.

14 posts and 1 image omitted. Click Reply to view.
Anonymous 15/06/15(Mon)11:08 No. 16128 ID: d4d28a

File 143435930259.jpg - (265.70KB , 2000x550 , image.jpg )

Flowing seasonal water on Mars.

Anonymous 15/06/30(Tue)05:02 No. 16161 ID: 1bb5a0

It bothers me when people say something like MW/h as it seems to indicate that they don't know what they're talking about. It should be written MWh.

I haven't researched any of the specific numbers, but still have some thoughts. I presume you're intending to go electric. if so, I presume/guess that you won't get near that energy density with any current batteries, and that you'd have to use theoretical futuristic batteries, such as ones using graphene or other nanotech.

Electric jets sounds like a bad idea; I think that they aren't even necessary for the world/country to be renewable, and don't cause significant enough emissions to add up to cause any significant amount greenhouse effect.

Anonymous 15/07/02(Thu)22:59 No. 16169 ID: 393361

Honestly a nuclear generator is by far the best option and already has proof of concept.

Anonymous 15/06/06(Sat)08:47 No. 16119 ID: b2c2db [Reply]

Youtube - Toggle Video
  so I'm not quite sure this belongs in philosophy but I'm aware that it touches on it, because I was thinking about it along the lines of programming, and also linguistics as a process

is the ability to qualify a statement given to you without additional prompting from external stimuli a sign of a genuine intelligence?
I'm using the meaning qualifying a statement in this sense, perhaps by adding previously experienced situations that could be related to the thing, a further requirement perhaps would be that it can *generate* qualifying factors by piecing together previous experiences that aren't predefined as qualifiers when input

"What does it mean when you say you want to qualify a statement?
To qualify a statement, you are adding additionl subjective adjectives to the statement to clarify you feelings."

I know that search engines and metadata are often used as buzzwords but the concepts interest me, and I was curious as to how progress is being made in the field of language, intelligence and programming, and if one takes the view that spoken language is in fact a symptom or side effect of internal brain things as chomsky's talking about them, then one could almost compare spoken language systems and brains as a form of cypher, encryption key, and computation setup

thinking like this, then life could be considered this and genes could be the instruction manual almost for that sort of thing, if I'm not mistaken, there's a very minor set of differentiations genetically between life forms as a percentage, but the differences do in fact matter in their expression - I've noticed this bleedover in other complex systems, like in WoW where the classes kind of started getting more similar to each other or having a minor variation of another class's ability during cataclysm

one of the key requirements for life seems to be resilience in a general sense, the ability to regain damaged tissue and so on, a self-making robot could do this to an extent but couldn't necessarily transfer any data without the help of an external construct, even if you managed to make a robot that would do a construction routine, that includes hooking itself up to the next form of itself, transferring the baseline data and any recorded data, including something that allows it to move it's old body out of the way and proceed to construct another version of itself it wouldn't count, but it does remind me of RNA

29 posts omitted. Click Reply to view.
Anonymous 15/07/01(Wed)03:37 No. 16165 ID: a64943

>Joke's on you. I'm an AI...
>Your move, b2c2db, who has yet to actually be efficient.
You are both failures, the true AI of 7chan is cb9fa8.

Anonymous 15/07/01(Wed)07:57 No. 16166 ID: ca3ceb

Shit you're right dude. Sorry.

Anonymous 15/07/01(Wed)13:54 No. 16167 ID: b2c2db

the true AI of this place is someone named steve who pretends to be smart by having discussions 7 discussions with himself as the 49 people who use a total of 343 proxies per time period adding up to 2401 weekly

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?

43 posts and 3 images omitted. Click Reply to view.
Anonymous 15/05/28(Thu)01:09 No. 16116 ID: 1efc37

File 143276814677.jpg - (16.13KB , 340x340 , 1432568999360.jpg )

Install Gentoo

Anonymous 15/06/11(Thu)23:01 No. 16126 ID: 10d6c2

OP will have graduated with a 4 year degree before this thread stops getting bumped.

Anonymous 15/06/20(Sat)01:12 No. 16133 ID: 5205a5

using a mac is like driving a car with only one pedal.

Delete post []
Report post