-  [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
  • Maximum file size allowed is 5120 KB.
  • Images greater than 200x200 pixels will be thumbnailed.
  • Currently 463 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. 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.

7 posts and 2 images omitted. Click Reply to view.
Anonymous 13/09/17(Tue)06:00 No. 15308 ID: ba9e6c

bib.tiera.ru is back up - lots of math and physics texts are available there

Anonymous 14/07/26(Sat)16:15 No. 15769 ID: aaad3e [Reply]

File 140638415056.png - (122.91KB , 400x282 , Picture 1.png )

Do you know any good alternatives to MRIcron if I want to take a MRI scan and turn it into a 3d printed model?

Anonymous 14/04/24(Thu)21:56 No. 15638 ID: cf7d56 [Reply]

File 139836940417.jpg - (32.02KB , 599x399 , image.jpg )

Faggotry is hormonal imbalance. It has to be. What else could it be besides environmental trauma?

14 posts and 3 images omitted. Click Reply to view.
Anonymous 14/07/20(Sun)19:04 No. 15762 ID: a4fae5

OP, it's an evolutionary population control mechanism. When a particular society gets too big, the gay. Gene gets switched on in more people.

Anonymous 14/07/21(Mon)07:43 No. 15763 ID: 789203

What exactly triggers this switch, and how?
How did it evolve? This is a particularly important question, because it's an adaptation that reduces the chances of reproduction of the individual. Seems like it would be antithetical to natural selection.
Why homosexuality and not simply sterility?

Matchbox+Prince 14/07/26(Sat)12:09 No. 15768 ID: 2f260d

>When a particular society gets too big, the gay. Gene gets switched on in more people.

You don't know anything about genetics or evolution, do you?

(I could do this all day, guys.)

Does hebe/ephebophilia exist or is it a part of normal male sexuality? Anonymous 13/10/01(Tue)21:06 No. 15342 ID: 41038f [Reply]

File 138065437688.jpg - (85.24KB , 640x917 , ryan newman.jpg )

Here's part of an email conversation I had with a psychologist about male preferences for adolescent girls. I refute a biological argument that is a maladaptive preference and defend the view that it's normal for men to find adolescent girls highly desirable. I thought you guys might find it interesting.

Hello and thanks for your quick reply.

I've read over the attachment and found a few errors that I'd like to explain to you.

Firstly, the figure of 19 as the average age of first reproduction for prehistoric girls is a bit high. The problem is that most modern HG societies aren't really living in the same way our prehistoric ancestors did. They live in poor territories because the most productive areas are now occupied by states and civilisations. They have harsh lives and poor diets which leads the girls not beginning to ovulate until an abnormally late age. In healthy, properly nourished HG societies the average age of a girl's first pregnancy is a bit lower at about 17 and this is presumably the way it was for prehistoric people.

The second big error that struck me was concerning Kramer's figures for the reproductive success for girls given the age they start reproducing. The claim is that because girls who start reproducing in early adolescence were less reproductively successful than those who start in late adolescence, men who preferred the younger group would be less reproductively successful themselves and become a minority in the population. This is really a very big mathematical error because it presumes that a girl would start reproducing at the age a man "attaches" himself to her. This is clearly not true as we already know that the typical age of a girl's first pregnancy is late adolescence. A man may begin a sexual relationship with a girl in early adolescence but she wouldn't typically fall pregnant until late adolescence.

The fact that girls who start reproducing in early adolescence are the reproductively least successful doesn't mean that men who have preferences for them will become a minority in the population but rather that girls who start reproducing in early adolescence will become a minority in the population. A prehistoric girl that started reproducing in early adolescence would have left behind fewer offspring than a girl that started reproducing in late adolescence so that in the long run girls that start reproducing in late adolescence would come to dominate in the population. This is exactly what is observed. As I have said, in healthy modern HG societies the typical age of first pregnancy is late adolescence at about 17. Girls may have sex in early adolescence but they rarely get pregnant at that age. Evolution has selected for low fertility in early adolescence because it's not the best age for a girl to start reproducing.

Message too long. Click here to view the full text.

7 posts omitted. Click Reply to view.
Anonymous 13/10/07(Mon)20:59 No. 15358 ID: 0cbfd8

Is this thread scientific? More or less, what I am seeing in the quoted portion of the OP is a researcher in the hypothesizing stage before gathering experimental data. There is not much good data to be had on this topic, and it is unlikely that we will see good data within my life time. This is not only due to a social climate which makes this line of research unpopular but also a technological problem. We have no history machine for gathering statistical data from periods before such data was recorded. Contemporary underdeveloped societies are a poor substitute for historic and prehistoric societies (as was observed in the letter). Even in historic socieities, any data on birthrates, newborn death rates, or maternal death rates is practically nil before the 18th Century and even then spotty. If you are looking for something like marriage ages of commoners or puberty ages, forget about it. Dan Carlin made an episode about this lack of info in his show, Hardcore History.

Anonymous 13/10/09(Wed)12:54 No. 15362 ID: a8afb2


>replying to a thread days old, I'm mega new here so for all I know this is normal on 7chan. If not just ban me and be done with it.

I agree on the premise that this study belongs on this board, the subject matter itself while disturbing is being observed in a scientific method, focusing on the underlying nature of man to target women based on their biological clock, over the morality or reasoning such individuals go through in their defence. I draw issue with a couple of points, in that I believe OP used evidence that is in his interpretation biased towards his argument.

I disagree with the notion that the majority of porn searches involving actresses wearing school-uniforms and other adolescent attire is a direct result of a male desire for the under-aged sex, as a throw back to our days of seeking women who have not yet matured. I would argue that such roles are designed to play off the fantasies that are developed during adolescence, (having sex while at school with teachers or a school girl being an incredibly common theme, to the point where it is universal) and at a stretch could be linked to a desire to see the "naughtier side" of people perceived to be innocent.

In regards to the argument that the highest number of searches are made for under-age girls of 16 years of age, I would need to see some statistics from providers and host websites before accepting this. While there is a desire to have sex with women of a younger age to men, and visa versa with women to older men, I challenge the idea that the majority of men find the face of a 16 year old more attractive than those more defined features of women of their early to mid 20's. There isn't an all 14-16 year olds edition of PlayBoy magazine.

And in conjuncture with what other anon's have already stated, basing a hypothesis of historic man's target age range is almost impossible with the limited evidence at this point. Although there are documented cases of royal families of the 1200's and later periods marrying sons and daughters at an almost infantile age, this is almost always done for political reasons. Going before that the evidence is almost non-existent, and we can only really make presumptions based on societal pressures and geological location and conditions.

Anonymous 14/07/26(Sat)06:16 No. 15767 ID: 205b9f

Logically, though, wouldn't most people deny any attraction to girls below at the least 16?

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?)

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

File 139996955137.png - (8.43KB , 82x77 , CF-logo.png )

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!

4 posts omitted. Click Reply to view.
Anonymous 14/06/04(Wed)08:42 No. 15715 ID: d98933

Exactly. Privacy? Security? On a board that does not allow anonymous posting? Let me guess, you log ips and keep the records while talking about all that hacking stuff too.

Anonymous 14/06/23(Mon)04:43 No. 15746 ID: df86e5

We obviously have to log IPs due to the many card spammers that come. We won't disclose anyone's IP unless legally required.

Anonymous 14/07/25(Fri)13:25 No. 15765 ID: 52a81c

Tell that to google, dancing man

help wer 14/06/27(Fri)00:24 No. 15749 ID: ad7ee9 [Reply]

File 140382149423.jpg - (0.96MB , 2048x1536 , 20140626_205905.jpg )

What the fuck is this!!!

1 post omitted. Click Reply to view.
Anonymous 14/06/27(Fri)01:20 No. 15751 ID: 9102bd

HCl and NaOH precipitate salt (NaCL) and dihydrogen monoxide (HHO), the source of all evil in this world

Anonymous 14/06/27(Fri)09:45 No. 15752 ID: 856bb6

File 140385512411.jpg - (28.46KB , 503x345 , IMG_155644668428229.jpg )

H2O nigga. It's the only stuff remaining. I do A2 chemistry. H2O (commonly known as water) is a common product in many reactions.

Anonymous 14/07/25(Fri)13:24 No. 15764 ID: 52a81c

what is 'flying materials?'

Which ThinkPad? Anonymous 14/07/04(Fri)03:02 No. 15757 ID: 327a8a [Reply]

File 140443575815.png - (287.31KB , 1000x1000 , KTGee_Used_Thinkpad_Guide.png )

Help me decide which Thinkpad I should get. I basically just want something I can use in CS class and installing either Kubuntu, Xubuntu, Arch or Gentoo on. I also prefer if it has 16:10.

Anonymous 14/07/06(Sun)19:52 No. 15759 ID: 3c414f

do not get a thinkpad, they have that business security thing on the cmos, if you engage that, you now have a brick.

Anonymous 14/06/03(Tue)03:43 No. 15708 ID: cd3867 [Reply]

File 140175978382.jpg - (114.95KB , 2000x1000 , math n shit.jpg )

How is it possible to divide two natural logarithms? If i'm not mistaken, it can be done if the two numbers can be derived into obvious exponentials, but what if they are not?

For example: Ln4/Ln2
This should be solvable without a calculator, but what about:

Keep in mind it's been a while since i math'd and also, english is not my first language, in case i don't make any sense.

1 post omitted. Click Reply to view.
Anonymous 14/06/03(Tue)05:13 No. 15712 ID: cd3867

>2 to the what is 6?

This i most certainly do not know.
Also, it doesn't necessarily have to be this particular equation, i just made that up to see if there is any general rule to how one can divide natural logarithms. Without using a calculator of course.

Anonymous 14/06/16(Mon)00:58 No. 15744 ID: 178005

ln(x)/ln(y) = logy(x) = log(x)/log(y)

So you'll need a calculator unless x is a power of y.

Anonymous 14/07/05(Sat)01:49 No. 15758 ID: c7cc52

2 to the ln(6)/ln(2) is 6, so ln(6)/ln(2) is ln(6)/ln(2)

Anonymous 14/06/30(Mon)14:42 No. 15756 ID: aaad3e [Reply]

File 140413213526.jpg - (55.05KB , 620x349 , JD-art-junglefever-20130301210255614779-620x349.jpg )

Can I leave my CT scan printout in the sun and out in my room or whatever or does it get damaged?

And if I take a photo of it, will that be 'good enough' to reference it in the future or do I need the original?

How about MRI scans? I'm going to get one of those too soon.

Delete post []
Report post