[a / b / c / d / e / f / g / gif / h / hr / k / m / o / p / r / s / t / u / v / vg / vr / w / wg] [i / ic] [r9k] [s4s] [cm / hm / lgbt / y] [3 / aco / adv / an / asp / biz / cgl / ck / co / diy / fa / fit / gd / hc / his / int / jp / lit / mlp / mu / n / news / out / po / pol / qst / sci / soc / sp / tg / toy / trv / tv / vp / wsg / wsr / x] [Settings] [Home]
Board
Settings Home
/sci/ - Science & Math

[Advertise on 4chan]

Name
Options
Subject
Comment
Verification
4chan Pass users can bypass this verification. [Learn More] [Login]
File
  • Please read the Rules and FAQ before posting.
  • Use with [math] tags for inline and [eqn] tags for block equations.
  • Right-click equations to view the source.

06/20/16New 4chan Banner Contest with a chance to win a 4chan Pass! See the contest page for details.
05/08/16Janitor acceptance emails will be sent out over the coming weeks. Make sure to check your spam box!
04/28/16New trial board added: /qst/ - Quests
[Hide] [Show All]


Voting open for the 4chan Banner Contest! See the contest page for details.

[Catalog] [Archive]

File: sciguide.jpg (9 KB, 200x140)
9 KB
9 KB JPG
https://sites.google.com/site/scienceandmathguide/
>>
Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

If you want advice regarding college/university or your career path, go to /adv/ - Advice.

If you want help with your homework, go to /wsr/ - Worksafe Requests.

File: thermo.jpg (29 KB, 355x475)
29 KB
29 KB JPG
Hey Anons, I was searching for a good Thermal-newbie book (first-second year). This one worth a look? (Van Wylen and Sonntag)
>>
thermodynamics isnt science
study real physics
>>
>>8378640
please respond to my post :(
>>
bump

If I get a degree in Mathematics, how can I use research in that field to contribute to society?
>>
File: 1465025790713.png (684 KB, 810x720)
684 KB
684 KB PNG
You can't. If you do research on a field, it is either trivial per se or some other research combined with yours will make it trivial.
>>
>>8378788
Mathematical engineering.
/thread

File: pepe maga.jpg (24 KB, 486x486)
24 KB
24 KB JPG
is /sci/ mostly right wing?
5 replies and 1 image omitted. Click here to view.
>>
>>8378700
Sort of.
>>
Science is non-partisan. I believe eugenics is a good thing if done right, that there's nothing wrong with abortion and stem-cell research and that there is significant anthropogenic climate change because there's evidence for all those things. Science, like religion, is something brought up by both sides when it suits their point of view.
>>
>american definitions of political terms
>>
>>8378775
not an argument

reality has been redpilled
>>
>>8378700
no and additionally it doesnt fucking matter.

we all want the politics threads to leave. if you do not want them to leave, then you are a /pol/tard perpetuating them. stop.

File: Mars.png (264 KB, 1600x699)
264 KB
264 KB PNG
Elon Musk just did a live conference about Mars travel, space ship and technology.

You can see it here:
http://www.spacex.com/mars

Basically they plan to start sending 2 ton unmanned cargo(I belive the heaviest anyone sent on Mars so far was 700 kg) by 2023 and soon after start sending humans. They predict travel to Mars could be as fast as 90/80 days.
280 replies and 44 images omitted. Click here to view.
>>
>>8375387
what requirements would you plebs put on the applicants

>run 100m within 11 sec
>lift atleast 2x bw if male, 1.5x female
>have some kind of skill or trade
>be european or eastern asian (genetically)
>no criminal record
>no deadweights (journalists and other meme areas)
>>
>>8378325
is neet shitposter with 10 years experience the sorta person they want?
>>
>>8377598

Less than a millimeter of aluminum foil blocks 100% of UV light. Gamma rays are not common enough to be an issue.
>>
>>8375387

pleb tier conference
>>
File: dc 9.jpg (13 KB, 300x169)
13 KB
13 KB JPG
>>8377689

>Ship capacity is ~100 people

pic related is the minimum amount of space just to hold 100 people with economy seating, notice how it's huge (slightly bigger than the space shuttle). Then factor in life support (air, water, food) for a 1-2 year trip (assuming supplies are shipped to Mars in advance or are made locally).

Also, let's not forget the irony here: 50 years ago NASA concepted a "passenger" space shuttle that could seat 100 people as well, like a DC-9.

In seriousness, I'm far more interested in seeing a 300 ton-to-LEO *cargo* vehicle than a passenger vehicle. The former could actually be useful in the near term, as it could ferry a huge amount of construction equipment and supplies which could be operated remotely (either on earth, or from a Martian space station).

File: cryptology.jpg (279 KB, 1293x796)
279 KB
279 KB JPG
Any recommendation on cryptology publications?
27 replies and 3 images omitted. Click here to view.
>>
>>8378754
Alicia says hi.
>>
>>8378748
By enforcing extra laws to proscribe for newer and innovatie f technologies? For instance the atom bomb and unwarranted reluctancy toward nuclear power.
>>
>>8378781
in my opinion evolution is not just about enforcement but about interpretation and understanding. The first layer of the OSI layer model imo is the human layer. A lot of people fail to understand or to try to improve on that.
>>
I see a future similar to this: https://www.youtube.com/watch?v=K0-sR-CB570
>>
>>8378786
Well in my country, United Kingdom, they are implementing programming into primary and secondary education. I suppose that's a step forward?

File: Chicken.jpg (86 KB, 901x709)
86 KB
86 KB JPG
I'm going to be dissecting some chickens for the first time tomorrow morning.

I'm an engineering student and I've never cut up any intact animals except for fish.

Any tips?
3 replies omitted. Click here to view.
>>
>>8376552

uhhhh cut it with a knife or something sharp is probably a good tip.
Idk anything else ask someone who works at KFC or something since they cut chickens and stuff.
>>
It actually wasn't as bad as I thought it might be. Unfortunately the scissors they gave us were dull and shitty but once I got the hang of the process it went pretty quickly.
>>
I've butchered cleaned ones before, but never taken it from the top.

If I saw this before you already did it, I'd have said this:

I know extracting organs probably doesn't have much in common with extracting drumsticks, but if you find the body a little stiff and want to make it more pliable, use the heel of your hand to break the spine. Straight elbows, one hand over the other, and throw a little weight on it from your upper body- like you're giving CPR. That loosens them up a lot.
>>
>>8378770
There was no need to worry about loosening anything up, all we had to do was cut away the breast skin, pull it off, collect the crop, cut the ribs and lift the breast, remove out the gizzard and proventriculus, and then find and cut out the ileum.
>>
>>8378789
Ah. Yeah, that sounds straightforward.

I used to have to get the skin off in a single piece for wrapping gallantines. Bloody impossible unless they're floppy.

File: nobel.jpg (8 KB, 186x186)
8 KB
8 KB JPG
It's a week before the Nobel Prize laureates are going to be announced. Who else is hyped?

Prizes that actually matter:

Medicine and Physiology
https://www.nobelprize.org/nobel_prizes/medicine/laureates/2016/

Chemistry:
https://www.nobelprize.org/nobel_prizes/chemistry/laureates/2016/

Physics:
https://www.nobelprize.org/nobel_prizes/physics/laureates/2016/
12 replies and 1 image omitted. Click here to view.
>>
>>8378669
lmao, remember actions speak louder than words.
http://www.nytimes.com/2014/09/22/us/us-ramping-up-major-renewal-in-nuclear-arms.html
http://www.nytimes.com/2016/05/27/science/nuclear-weapons-obama-united-states.html
http://www.democracynow.org/2016/4/15/obama_s_trillion_dollar_nuclear_arms
>President Barack Obama announced a 30-year, $1 trillion program to modernize the U.S. nuclear-weapon arsenal.
>>
Apparently the guys responsible for detecting gravitational waves are pretty confident (one of my lecturers helped out on the project). Honestly, I can't see it though. They only confirmed something that was predicted by Einstein. The prize for the Higgs wasn't given to the guys at CERN, it was given to Peter Higgs himself (and the other guy, whose name escapes me). I feel bad that they've got their hopes up now.
>>
>>8378527
reminder that Nobel is famous for inventing dynamite, which he thought would lead to wars being too terrible to fight. Instead it led to the first era of terror bombing.
>>
>>8378694
He literally made all of his money as an arms dealer. He only established the award because he developed a guilty conscience later in life.
>>
>>8378527

>Muh Obama meme

Look at this pleb, anon Ghandi didn't get one. The prize pretty much lost most of it's luster as soon afterwards.

Not that it matters since you probably never had enough knowledge about it's laureates to legitimately care about the peace prize.

can /sci/ redpill me on DMT? seems like it's almost mainstream now and with every retard who's done it spouting about it's magical properties. It seems to have started with Dr.strassman and his hypotheses about it being responsible for near death experiences and dreams being taken as fact.
How much of this has turned out to be true? I know some study showed its presence in the pineal gland of rats or something like that. I also know it's found in varying amounts in different human fluids/organs. Does any of this mean anything? Are the amounts found in humans too low to be indicative of anything? Could its presence be explained as simply a metabolic byproduct? what type of reactions would produce it? Is there any current research about possible uses the human body has for it (I believe i've heard digestion being one)?

tl:dr : what are arguments for and against DMT being a significant molecule in human physiology.
2 replies omitted. Click here to view.
>>
>>8378729

It IS found in humans, and levels are higher when you're dreaming, so there's definitely some kind of connection there. Afaik no studies have been done on dying people specifically to measure DMT levels, maybe that could be your contribution to science, Anon!
>>
>>8378729
You'll probably kill yourself in the process, you degenerate drug addict.
>>
For real though, it's not magic. It doesn't open your eyes. It's not fun. Altered states of consciousness don't give you answers they give you better questions. There's no reason to believe it has any grand purpose in the universe. It's just a chemical we don't really know a reason for why it exists and there likely isn't a "reason". It might have something to do with dreaming but the connections hazey. Same with the NDE thing. It's been found in the urine of about 5% of the general population but 60% of psychiatric patients.
>>
it's magic. It open your eyes and It's fun. Altered states of consciousness give you answers and they give you better questions. There's reason to believe it has grand purpose in the universe. It's a chemical we don't really know a reason for why it exists and there likely is a reason. It has something to do with dreaming and the connection is strong. Same with the NDE thing. It's been found in the urine of about 5% of the general population but 60% of geniuses.
>>
>>8378753
I know it's found in humans, I specifically asked questions about it. But there's a jump from being endogenous and being made by the body for a specific purpose.
>and levels are higher when you're dreaming
source?
>>8378761
I have never done DMT nor do i have any special itch to do so.
>>8378763
I realize the connection is loose and I actually think there isn't one. When someone blabs about it though, i'm not exactly sure what to say about its presence in the human body. Are the levels found small enough that it's probably just a byproduct or are they significant? Also, what about the production of it in rats? I realize those things alone are weak proofs, but most people don't take "we don't know yet" as an answer.
>>8378767
kek

File: 1367338183945.jpg (239 KB, 520x638)
239 KB
239 KB JPG
Post all of your stupid questions that don't deserve their own post.

I'll start: Why is Physics harder than it should be for a computer engineer major?
177 replies and 34 images omitted. Click here to view.
>>
>>8378535
AH I get you. I get that for any 8 integers you pick there will be 28 distinct pairs. There are only 14 differences to assign, but the key here is that 14 has only 1 pair so there's one left over that will have to be a repeat?

Thanks bro. Seriously means a lot.
>>
So this is a pretty stupid question, but:

Why does having every sequence having a subsequential limit imply that the set is closed?

This is a real analysis question, so strictly topological explanations are a bit lost on me.
>>
>>8378608
Yes.

14 differences shared amongst 28 pairs, and the case of each difference occurring exactly twice is excluded because 14 can't occur twice. So one must occur at least 3 times.

I have no idea how to apply the pigeonhole principle to #4. May be related to the fact that (10^n)%2017 is a full-period cycle.
>>
File: pigeonhole 2.png (69 KB, 984x242)
69 KB
69 KB PNG
Me again.

6. I found that the answer is 32 by trying smaller examples and seeing that the pattern was diagonals. How would I explain this or use the pigeonhole principle though??

7. I see that it is impossible for 0 or 1 (the possible sums would only be (0, 1 ,2 ,3 ,4) hence more faces than choices.

What about -1, 1. Theoretically there are enough choices now
>>
>>8378787
I haven't got it to work for -1, 1 by just trying.

File: reading-list.jpg (126 KB, 600x400)
126 KB
126 KB JPG
Pretend you're a professor, what do you put upon your reading list?
9 replies omitted. Click here to view.
>>
>>8378484
>Pretend you're a professor, what do you put upon your reading list?

The stuff they're not going to learn in their classes.

The Elements of Style by Strunk and White
On Writing Well: The Classic Guide to Writing Nonfiction by Zinsser

The Craft of Scientific Presentations: Critical Steps to Succeed and Critical Errors to Avoid by Alley
Designing Science Presentations: A Visual Guide to Figures, Papers, Slides, Posters, and More by Carter

Unwritten Laws of Engineering by King and Skakoon
Advice to Rocket Scientists: A Career Survival Guide for Scientists and Engineers by Longuski

Whistleblowers: Broken Lives and Organizational Power by Alford
The Whistleblowers: Exposing Corruption in Government and Industry by Glazer
Whistleblower's Handbook: A Step-By-Step Guide To Doing What's Right And Protecting Yourself by Kohn

The Abolition of Man by C. S. Lewis
Ethics for the Information Age by Quinn

Comment too long. Click here to view the full text.
>>
>>8378689
This is probably one of the wisest posts on /Sci/, well done, anon.
>>
>>8378689
i mean they might be good book but what kind of course would include these
>>
>>8378728
I feel it was designed for engineering.
>>
>>8378673
What if it is an informative meme?

How do you get smarter? Legit question.
1 reply omitted. Click here to view.
>>
To become smarter, you need to not only add more tools to your toolbox, but also learn which tool is best for the job.
>>
>>8378732

This. Geniuses can intuit everything directly, the rest of us have to rely on technology.
>>
>>8378732

what if i want to invent new tools?
>>
Quit masturbating, dress appropriately for an adult and wash yourself daily.

A sense of self worth will make you a better person. You wont be smarter, you'll just be closer to your true potential.
>>
>>8378768
How many times can I jerk off in a week? I literally have to fap everyday otherwise I get super horny and can't hold it in. The last time I tried I started air humping cuz I was that horny.

File: Elon Musk.jpg (85 KB, 1200x900)
85 KB
85 KB JPG
Are there any good free resources for understanding AI/AI sciences?
>>
EdX seens to have a ton of classes on machine learning right now.
>>
>>8378611
looks just like coursera
>>
Just pirate russell and norvig you fuck

File: mathematics trench.jpg (359 KB, 1100x3300)
359 KB
359 KB JPG
How deep have you gotten /sci/?
78 replies and 10 images omitted. Click here to view.
>>
>triple integrals
>below single integrals
>>
>>8372125
I want to study cryptography but I make more money as a x Ray tech so nvm
>>
>>8378392

And yet, scientifically, we're so far ahead that it isn't even funny lol
>>
>>8371617
the serious math branch should be moved down a bit, I've done a number of topics below that and shudder at actual math (because I'm a pussy).
>>
>>8371617
Eigenvalues/Eigenvectors

File: 3-parentbaby.jpg (89 KB, 1240x930)
89 KB
89 KB JPG
http://www.independent.co.uk/news/science/three-parent-baby-world-first-born-mexico-a7333191.html

Dr Zhang told the New Scientist that, as the technique has not been approved in the US, the team went to Mexico where “there are no rules”.
“To save lives is the ethical thing to do,” he added.

The world’s first child created using a controversial “three-parent” baby technique has been born in Mexico, it has been announced.

According to critics, the procedure is tantamount to genetic modification of humans or even “playing God”. But supporters say it allows women with a particular type of genetic disease to have healthy children who are related to them.
The child’s mother has Leigh syndrome, a fatal disorder that affects the developing nervous system and would have been passed on in her mitochondrial DNA.

Although she is healthy, two of her children have died as a result of inheriting the disease: a girl who lived until she was six and an eight-month-old baby.
62 replies and 8 images omitted. Click here to view.
>>
>>8377748
Indeed. People don't call it 'artificial termite harvesting' if a chimp uses a stick after all.
>>
>>8374511
>>8374447
This.

>>8375657
Came here to post this.

News media has a short fucking memory and no research skills.
>>
>>8377578
>Why can't science give me a magic pill now! Buaa!
Keep deluding yourself, brainlet. ;^=)
>>
>>8378026
>comes to /sci/ just to post shitty bait in multiple threads
>>
>>8377830
>>murder is wrong because it wastes economic potential and the resources invested to raise such a person.

you tell me that murder is wrong and you give a reason why.

i tell you that you're making an ethical argument. if you don't think that you are engaging in ethics then you commit yourself to speak only of facts and descriptions, but without any notion of wrongness or wastefulness. if that isn't the case, then you mean to say that murder is factually wrong?


Delete Post: [File Only] Style:
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
[Disable Mobile View / Use Desktop Site]

[Enable Mobile View / Use Mobile Site]

All trademarks and copyrights on this page are owned by their respective parties. Images uploaded are the responsibility of the Poster. Comments are owned by the Poster.