Catalog (/sci/)

test

mod please delete

Rewrote this to be slightly less shit.

Anyway, welcome to not-halfchan-/sci/, home of actually intelligent and decent discussion. Of course, anarchy tends to prevent this, so we will have to have rules.

1: Religion vs science arguments are prohibited. Take that shit over to /rel/, please. Or, better yet, don't fucking do it.

2: If you're here to ask for help on homework, go to >>>/hwk/.

3: Sources for all facts, okay?

4: Keep topics related to science and mathematics, please. It's the name of the board for a reason.

More can be added if necessary. Again, don't make it necessary.

Space General

looking for high school tier physics books, what should i get?

Just how accurate is this? And isn't there a name for this theory/idea? I can't find what it's called. Wouldn't the idea of left and right brain be named after someone or have some sciencey wibbly wobbly name?

Random science questions that don't need their own thread thread?

Title says all.

It's getting pretty hot where I live and I was going through my closet when I had the thought, since as I understand it radiating heat is based on surface area, and I think baggy clothes has more surface area, would wearing baggy clothes keep you cooler?

Assume in all other factors baggy pants and non baggy pants are magically the same somehow. Or not, whatever.

Flat Earth

Does someone have refutations to these flat earth videos that are popping up

debunking new-agers

My buddies mom is a typical new age pseudoscience type

>Claims to love science and mathematics yet misuses and conflates physical laws with magic

>Both she and her 16yo daughter are "certified reiki masters" and she claims her daughter is a"wise old soul" despite how she dropped out of highschool and is already on the pill

>Believes that specific words hold speacial powers (referring to the widely debunked ice crystal word experiment in which a japanese quack taped two seperate notes((one said "i love you" the other saying the opposite" with to two differant containers of water then froze them and said that effected the way in which the ice crystallized)

>She also says "everything is a wave" but when I try to confront her about it she just parrots "muh E=mc2!!!"

How do I debunk this bitch?

Not enough chemistry here on /sci/

Anyone in the field?

Favorite reactions (more orgo based, I guess)?

Favorite topic to study?

Current/recent work?

>currently in a Ph.D program for computational chemistry

>Fischer-Indole

>I enjoy studying biological systems

>currently working on simulating a biochemical rxn, and developing SOME software

pic related

Science project

Hey /sci,

I am in secondary five and for the last year of school we have to do kind of a big project. I wanna do something physics related but I don't know what exactly. Something like an experiment or a research on physics, maths, logic, etc. Do you guys have ideas about an experiment that I can do or research subject?

I have a good understanding of physics and im good in math (For my age).

I dont wanna do a little science fair thing… Something that I will had to work on a lot

Can science explain this?

How to get over failed class depression?

Just failed the same remedial high school math class for the second time in a row.

This time, I have a just fine overall grade but I got below a 70 on the final, so therefore I didn't pass the class.

How do I get over this crazed depression? How can I expect to go anywhere in science when I can't pass a remedial high school course on my second try?

Asperger's syndrome seems like evolution adapting for life as a member of a hive

OK, I know this sounds really stupid and probably incredibly basic of /sci/ levels, but I'm having issues conceptualizing the idea of electricity.

I know it's the flow of electrons and I imagine them being kind of "pushed" from atom to atom. I can also imagine maybe a magnet's negative pole (south) pushing away atoms with negative charges, while a positive pole (north) attracts them.

I also understand that turbines spin magnets around wires. I don't get why the magnets have to be moving and I don't understand why wires need to be coiled. I also don't understand how electricity from a generator that flows through a wire will manage to power a machine on the other end of the wire (for example, just making a wheel spin on the other end).

I took basic physics in high school and passed, but only because I just memorized the material the teacher gave us. I've been cruising vids the last few days trying to find good explanations.

Sorry for retardation, but can anyone help?

Pic not related.

Agriculture. Does this even have a place on this board?

Background

Have a little hydroponics farm where i grow carrots, celery, broccoli, spinach, and potatoes. Looking to extend it into fruits. My main question is…

Can i grow fruits from a branch without the tree? Example growing apples from an apple tree branch hooked up to a hydro system like some kind of Frankenstein without having the rest of the tree. What would i study to make this a reality? Botony or agricultureal science? Is there a difference? Been floating around college and think i found something interesting enough to take as a major and would like to know any input from the people on this board.

HFY THREAD

NLPDEs - how hard?

how hard is it to go from linear algebra/calculus I to stochastic nonlinear partial differential equations?

I have an astrophysics question.

How would i find the velocity of a double planet system orbiting the center of mass? Ive been using V=squareroot((G×Mass center)/radius)

And ive failed miserably.

Is there a general mathematic way to find other LD numbers?

If so, what do you need to know to to find it? assume you have LD50.

or in other words, is there a formula for LDx given LD50?

ITT: Terraforming Thread (Paraforming too)

I could have kept this in >>716

,but no one was really talking about it much and I think there would be more discussion if I made a separate thread. If Space General gets deleted we can use this one for non terraforming discussion I guess.

Topics to get started:

How can we restart Mars' magnetosphere?

If someone where to Terraform a body, how would they balance the ecosystem?

How the fuck would Venus be able to be terraformed? We all have somewhat of an Idea of how mars would, but how the fuck will it work with Venus?

When do you think mankind will discover a new energy source? We have Nuclear, And Electricity as top contenders but is there any thing else we can efficiently harness energy from?

>inb4 Solar

So, Pluto isn't a planet.

I've got news for your son.

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

College name vs GPA? Is it better to study in a shit place and have good GPA or to study in a good place and have shit/average GPA.

All Unis in my country are shit(nothing in top 250) and mostly unknown to westerners. My goal is to go to Europe for Graduate/Master's degree(Engineering).

are there videos of someone welding with gas shielding but the shielding is colored?

woo thread

Is phrenology or Crystal therapy the best way to check your quantum chakras?

Can you help me to solve this?

Okay there was this dude on the interwebz who was like:

>if you're stranded 10 meters away from the ISS… wouldnt it pull you in, with gravity?

So i was like "sure, maybe i can calculate how long it would take to pull you back".

But I've spent hours with this and i think i still have wrong answer.

So yeah, I KNOW THIS IS WRONG, BUT I DON'T KNOW IN WHICH PART I'VE MADE MISTAKE.

Pls help red /sci/onymous.

At first i thought it will be simple:

I'm just going to take equation for gravitational force F = G * ( m1 * m2 / r^2) and then you put this force into newton's second law of motion a = F / m and then calculate the time by using t = sqrt (2s / a)

But then i realized that it would be inaccurate, because as you get closer that gravitational force between you and space station would increase.

I can't do any higher level mathematics for solving this accurately, so i cheated. I said: Let's make it much more accurate by dividing this path into more chunks, calculate everything for those chunks separately and then add those times together. It is cheating but it's best i can do.

Problem is that i don't know if i used enough of these segments.

And another big problem is that ISS is not just mass point, but it has some volume and as you get closer the gravitational force disperse to the sides. I have not accounted for that.

Also i didn't count gravitational pull the other way that you have on ISS, because i've tried to calculate it and it looks negligible.

So this is only rough approximation.

The mass of ISS is about 450t according to wikipedia. Let's say your mass is 80kg. Gravitational constant is 6,67·10^-11 [of bullshit units].

Also we must assume there is absolutely 0 relative velocity between you and ISS.

First segment:

F = k * ( m1 * m2 / r^2)

F = 6,67*10^-11 * ((450 000 * 80) / 10^2)

F = 0.000024012 N

a = F / m

a = 0.000024012 / 80

a = 3.0015*10^-7

t = sqrt (2s / a)

h will be 2m because second segment will be 8m so we calcullate it only for 2m

t = sqrt (2*2 / 3.0015*10^-7)

t = 3650.57 s

Second segment:

F = 6,67*10^-11 * ((450 000 * 80) / 8^2)

F = 0.00003751875

a = F / m

a = 0.00003751875 / 80

a = 0.000000468984375

third segment will be 5m se we calculate only (8-5) m = 3m

But there is a problem: we already have some velocity, so i can't use t = sqrt (2s / a).

I think i should use this formula s = v0 * t + 0,5 * a*(t^2) and somehow get t from it.

And v0 calculate as v = v0(of previous segment) + a * t

v0 of previuos segment is in this case 0 but in the next segment it should be this v0

I'll be honest, i cheated and used this online calculators:

http://planetcalc.com/981/

and

http://www.calculatorsoup.com/calculators/physics/velocity_a_t.php

And this is what i got:

v0 = 0.0010957185855 m/s

t = 1935.89 s

Third segment:

F = 6,67*10^-11 * (36000000 / 5^2)

F = 0.000096048

a = 0.000096048 / 80

a = 0.0000012006

Next segment is 2m so we put here (5-2) = 3m

Time for online calculator again…

v0 = 0.0020036207472187

t = 1120.87 s

4th segment:

F = 6,67*10^-11 * (36000000 / 2^2)

F = 0.0006003

a = 0.0006003 / 80

a = 0.00000750375

length of segment is 2 - 1 = 1

Calc time…

v0 = 0.0033493372692187

t = 236.12 s

5th segment:

F = 6,67*10^-11 * (36000000 / 1^2)

F = 0.0024012

a = 0.0024012 / 80

a = 0.000030015

length is 1 - 0,5 = 0,5

now calc

v0 = 0.0051211227192187

t = 79.24 s

6th segment

F = 6,67*10^-11 * (36000000 / 0,5^2)

F = 0.0096048

a = 0.0096048 / 80

a = 0.00012006

length 0,5 because that is final segment

calc pls

v0 = 0.0074995113192187

t = 48.13 s

Now just add up all times together and bam 48.13 + 79.24 + 236.12 + 1120.87 + 1935.89 + 3650.57 = 7070.82 s

7070.82s = 117.847 min = almost 2 hours

But this doesn't make a sense. Only 2 hours is a bullshit.

So what the heck did i do wrong?

I know, you can solve this with your high level math, but i would appritiate if someone use the same method as me and tell me in which part i failed.

Science book collection

Dear /sci/fags I want to accumulate

a comprehensive collection of

ebooks about a multitude of sciences.

To do so I would like to hear

your opinions on which subjects

to cover and your recommandation

of books for said subject.

When collected I will drop the

collection (probably in parts) on

MEGA or GoogleDocs and post

a link on here and /pdfs/

Name everything you got and

I make it big.

Please keep the pop-science-faggotry

on a low level, this is intended

for (self)study of useable information

in each field.

Race Mixing

question for /sci/

Anybody have a good PDF of Baby Rudin? Preferably with text rather than just scanned images.

Best life changing sci books?

MARDN

HI MARDN

BET YOU CAN'T REDTEXT

\left[\frac{hello}{newfag}\right]

\huge BET YOU CAN'T HUGE TEXT

hi

Do rails like this, which have a hand grip and pull a person holding them through zero g environments, have a name?

I know early UC Gundam used a lot of real concepts like O'Neill cylinders but I have no idea what these are called

Why can't we find an alternative to vacuum for vacuum tubes and CRTs? Obviously, stuff like lead or even tinfoil blocks beta radiation fairly easily so that can't be used. But can't science come up with some space filling material that doesn't get in the way of electrons? I'm guessing that even helium gas still interacts with electrons and I'm guessing that using hydrogen gas might be a bad idea.

One possible idea I have is to shoot virtual electron "holes" through a metal solid but I have no idea of how that works physically.

Just wondering what sci thinks of this

SpaceX CRS-7 disappearing act

NOW YOU SEE IT, NOW YOU DON'T

14 days!

Multiverse Theories and 2D

EXTREME WEABOO QUESTION INCOMING

So some of my loser friends and I have 2D waifus. They argue that their waifus are, in fact, real because of the multiverse theory. However, none of them are actual astrophysicists and, in fact, are mostly just college dropouts working in either IT or shitty retail jobs that spend all their time playing video games and fapping to h-manga. Because of this, I wanted to consult some people that actually knew what they're talking about.

So what I'm asking is this: What is the validity of the multiverse theory? Are certain theories like the infinite universe theory more or less likely than something like, say, the parallel universe theory? not that I care much beyond the coolness factor since I consider mine "real" in the sense that thought patterns are a real, measurable series of electrical/chemical impulses, but it would still be nice to see if they're just spewing bullshit out their ass

Hello greekfag here.

Im getting my degree in chemistry soon and im planning on moving to a family member in the UK.

Can anybody tell me how is the reception for foreign universities there?

>inb4 pay debts

Take that shit to /pol/

what is you opinion of this /sci/?

has anyone else here seen this thing?

is there a simple scientific explanation for it?

how do fields interact with objects? i'm used to the idea that matter collision causes a force to be exerted, but how do fields and particles interact? i read about gauge bosons, but i can't picture it physically making sense. i mean if you propogate a packet to another particle so that it "knows" to feel a force, how does that magically produce the force, and how can the fields know where the particles are in relation to each other?

also, does gravity do this? i mean we know that particles have mass, but is the field being spacetime render the need for a mediator useless? i'm confused so hard about this. can all collision dynamics be reduced to being gauge bosons interacting with field excitations? like my hand and the bond energy being the electromagnetic interaction, striking a surface with inertia that's produce by the particles and their mass increasing momentum, but is this merely the sum of the messenger particles being absorbed/emitted on the quantum level by my atomic nuclei and the surface's nuclei? the bonds reverberating the collision are the electrons being excited from their valence shells slightly? or am i wrong thinking of it like this?

so i'm about to read a book on dark matter when suddenly

>Explores particle candidates for cold dark matter beyond the theory of the standard model, providing examples of basic extensions and introducing theories such as supersymmetry and extra dimensions

>extra dimensions

the fuck is this shit? is this m-theory?

Moon Landing

What is your take on the Moon Landing? Did it actually happen?

Muh Tesla

Any podcasts /sci/ like other than radiolab? Tired of these comedy pods

Libgen Preservation Project

As you may or may not know, libgen was went offline a couple of days ago. [1] For the uninformed, it was a piracy site provided by the Russkies that had ~60TB of non-fiction books, textbooks, science articles, and more. It went offline in the wake of a lawsuit from Elsevier. Now, this is not a centralized repository; it has had a public FTP server, and distributed torrents for the longest time, but let's not kind ourselves. Contemporary filesharers are bad at preserving that which is of importance, but is not in people's immediate interests. Therefore, fellow /sci/entists, I implore you, please download as many of the magnet links from this paste[2] as you reasonably can, and seed it until a future existence for libgen is certain.

Don't get me wrong, this very much not an appeal to moralfaggotry. Rather, I want to go to university someday, and I do NOT want to pay the cost of a powerful computer for textbooks alone!

We perhaps want to discuss alternative ways to preserve this treasure trove of academia, as well. After all, do we really want to leave it up to a bunch of silly ruskies?

[1]: https://torrentfreak.com/libgen-goes-down-as-legal-pressure-mounts-150622/

[2]: https://pastee.org/grb64

What do you guys think of this email I sent to my former biology professor? I don't go there anymore so it's not like I can get in trouble. I just don't give a fuck about anything anymore. I left the college for mental health reasons a couple of years ago, btw.

—

I told you when we met that I am interested in population genetics and human biological diversity. I have been doing my own reading. If you are interested, check out this bibliography:

www.humanbiologicaldiversity.com

“In a time of universal deceit, telling the truth is a revolutionary act.” — George Orwell

I want to seriously study this field, but I can only do it if I do not state at the outset what my interests are to adcoms. It’s too politically incorrect to be acceptable to most universities – as you will know if you clicked on the link to the bibliography I mentioned above.

I want to, in my own little and small way, destroy the neoliberal social reality we live in. I told you about how I felt excluded when I was at [my college]. I told you about the hatred I have for that place. I didn’t tell you about the cliquishness I experienced there, but I don’t think you would be surprised to learn that it was so.

I can’t do this type of work as a doctor, and I have learned that medical schools have a stick up their behind when a candidate is shown to have ANY mental health difficulties. I don’t think it is the right profession for me anyways, considering the suicide rate. And frankly, I am not interested in healing people.

Wherever the research on human biology takes me, I am sure I can carve a niche for myself. I will enjoy making the world a meaner, more brutal place for people to live in. :)

ITT: your favourite social scientists

>Eric Wolf

>Franz Boas

Salt-ice II

So, I'm planning on doing an experiment, and I want to make sure I don't…hurt myself, I guess. It's been a decade since I was in high school chemistry.

Ice has a phase diagram:

https://en.wikipedia.org/wiki/Ice#/media/File:Phase_diagram_of_water.svg

And I would think that it would be impossible for an average guy to have the equipment to make ice II, but the attached vid shows a fourth grader making the stuff.

Hold that thought. Here's the eutectic diagram for salt-water

http://www.chemguide.co.uk/physical/phaseeqia/salteutect5.gif

If I make the eutectic mixture (I don't know the proper vocabulary, I mean that 23% ratio in the graph) of salt-ice and then bring it up to the pressure of ice II, I'm curious as to what would happen.

I guess I'll leave this here for y'all to call me an idiot while I run off tomorrow to use a 12-ton car jack that when I try it will shoot a die cast out the side at 60 mph and kill me.

hi /sci/

what are some sites for problem solving? i know about brilliant aops clevermath khanacademy. any one know some others?

Any of you browse Academia@SE? Enjoy yet another retarded question that popped up on the hot questions list the other day.

>wants to be a professional mathematician but can't handle a simple hs class

>probably not even a hard class because he sounds like he's at some shitty public school not an gifted students school

>types like a retarded chink even though english is presumably native language

>still thinks he is so smart that he should be allowed to just bypass the entire institution of academia because he knows better than centuries of experience

>implying 15k is a realistic career goal (enjoy doing research when you're starving on the street lol)

>muh self diagnosed disorders

I'd like to see what he means by "finished an MSc book". Probably just flipped the pages and looked at the pictures.

>15 votes

Why do people upvote this shit? This is clearly just another retard that has a hopelessly skewed impression of his own abilities. There's one in a billion chance (literally!) that he's the caliber of genius that would justify letting him skip through the entirety of higher education and just "do research" (lol, who will teach classes? Who will supervise grad students? Who will organize conferences? Who will apply for grants? Who will sit at tenure review boards for new faculty?), and that's before considering how he types.

>hurr durr i'm 15 and i know better than everyone, just make me a professor of math already

is there any merit to the electric universe theory?

i get tired of hearing how stars have fusion going on as there source of energy.. cus hurr durr muh atomic bomb.

is it possible its an electro magnetic process instead

Dinosaur Extinction Event was more interesting than you think

Has anyone read the Wikipedia article on the Cretaceous–Paleogene extinction event? If you haven't, check it out. It is the most red-pilling, consciousness expanding thing you will read.

The key takeaway that I never knew about it, and I bet most pepole don't know, was that ALL TERRESTRIAL ANIMALS LARGER THAN 2 KG DIED OUT. All herbivores and carnivores died out (carnivores doesn't include insectivores and omnivores). LITERALLY THE ENTIRE PLANET WAS ON FIRE.

Here are some highlights:

Such an impact would have inhibited photosynthesis by creating a dust cloud that blocked sunlight for up to a year, and by injecting sulfuric acid aerosols into the stratosphere, which might have reduced sunlight reaching the Earth's surface by 10–20%. It has been argued that it would take at least ten years for such aerosols to dissipate, which would account for the extinction of plants and phytoplankton, and of organisms dependent on them (including predatory animals as well as herbivores). Small creatures whose food chains were based on detritus would have a reasonable chance of survival.[81][97] The consequences of reentry of ejecta into Earth's atmosphere would include a brief (hours long) but intense pulse of infrared radiation, killing exposed organisms.[51] Global firestorms likely resulted from the heat pulse and the fall back to Earth of incendiary fragments from the blast. Recent research indicates that the global debris layer deposited by the impact contained enough soot to suggest that the entire terrestrial biosphere had burned.[115]

There is clear evidence that sea levels fell in the final stage of the Cretaceous by more than at any other time in the Mesozoic era. In some Maastrichtian stage rock layers from various parts of the world, the later layers are terrestrial; earlier layers represent shorelines and the earliest layers represent seabeds. These layers do not show the tilting and distortion associated with mountain building, therefore, the likeliest explanation is a "regression", that is, a drop in sea level. There is no direct evidence for the cause of the regression, but the explanation currently accepted as most likely is that the mid-ocean ridges became less active and therefore sank under their own weight.[24][128]

A severe regression would have greatly reduced the continental shelf area, which is the most species-rich part of the sea, and therefore could have been enough to cause a marine mass extinction. However research concludes that this change would have been insufficient to cause the observed level of ammonite extinction. The regression would also have caused climate changes, partly by disrupting winds and ocean currents and partly by reducing the Earth's albedo and therefore increasing global temperatures.[98]

Marine regression also resulted in the loss of epeiric seas, such as the Western Interior Seaway of North America. The loss of these seas greatly altered habitats, removing coastal plains that ten million years before had been host to diverse communities such as are found in rocks of the Dinosaur Park Formation. Another consequence was an expansion of freshwater environments, since continental runoff now had longer distances to travel before reaching oceans. While this change was favorable to freshwater vertebrates, those that prefer marine environments, such as sharks, suffered.[80]

Species that depended on photosynthesis declined or became extinct as atmospheric particles blocked sunlight and reduced the solar energy reaching the Earth's surface. This plant extinction caused a major reshuffling of the dominant plant groups.[23] Omnivores, insectivores and carrion-eaters survived the extinction event, perhaps because of the increased availability of their food sources. No purely herbivorous or carnivorous mammals seem to have survived. Rather, the surviving mammals and birds fed on insects, worms, and snails, which in turn fed on dead plant and animal matter. Scientists hypothesize that these organisms survived the collapse of plant-based food chains because they fed on detritus (non-living organic material).[24][25][26]

Based on marine fossils, it is estimated that 75% or more of all species were wiped out by the K–Pg extinction.[20] In terrestrial ecosystems all animals weighing more than a kilogram disappeared.[21]

I'm an Anthropologist, do I get respect on /sci/ ?

c++ guy here, not sci guy, i have a question

hey guys, not a sci guy by any means

have a question for you

is it possible to sonar or mri or any other way to image the earth?

i would love to do a huge sonar scan on this piece of dirt. i was thinking sonar but idk how that would work, and my budget is only like 100k (lol i dont think its doable)

why wouldnt a sonar work?

if you know how i can do it post the method and please post the supplies needed and a rough cost if you can

you ever get scared of touching your neck, or relieving nitrogen bubbles in your spine? is it medically possible to apply pressure with your hand on your neck or head that could burst some sort of nodule which would then make you retarded?.

Foundations of Mathematics

>Moreover, since mathematics is largely a technical, as opposed to philosophical, discipline, it is not unreasonable that mathematicians should, in the main, get on with the business of pursuing their technical specialities without worrying unduly about foundational questions. But that does not give them licence to pronounce upon matters on which they have not seriously reflected and are ignorant, or to assume that expertise in some special branch of their subject gives them special insight into its foundations.

take note

Sci Conjecture. Thoughts?

Alright, science question. Mind you, I ain't the most intelligent bugger, raised in TN. But, questions. It involves bubbleverse theory, multiverse, dark matter and others.

General disclaimer: I use reactions and observations interchangably. Sorry if this causes confusion.

Can somebody explain to me how light and time are not the same force?

Or how dark matter could potentially be the mere absence of time?

We know time is affected by mass, while technically not having mass of its own. This could be due to the force of gravity, whereas upon approaching the event horizon time flows normally for the subject arriving, but is moving at an infinitely slow speed to an observer. (Surely, the gravitational force of the black hole must be warping time in some regard. I don't know for certain, I've never studied enough and wonder if you guys have.)

When we observe galactic drift throughout the universe, and notice that everything from center of perspective is accelerating from its projected course, is it a plausible explanation that dark matter is merely the absence of time?

Bear with me. I'll do a summary at the end, hope I haven't lost you yet.

Presume that mass, matter, antimatter, and etc. as we know it are only detectable because we live in a space of time.

We have energy via light given to us by a sun, a cluster, a galaxy and known universe. No matter what we as humans do on Earth, this will never change. Because while we are affected by the mass of our own body and consciousness, we will perceive time in some way due to the effects of mass and gravity, which distort time exponentially. (The higher the mass, the slower timeflow. This has been tested by clocking time in orbit of the planet versus groundtime; in space, time moves faster, but very minimally so.)

So in the absence of mass, timeflow increases.You could consider an analog to that of a river- whenever it narrows, due to jutting rocks or shores, waterflow increases around the masses in those areas. Water flows faster when the water is the same depth but smaller channel. It's an inverse relationship; where the presence of gravity and mass slow time, their absence increases its flow.

Does anibody know what is the estimated total length of veins in the human body ? And I'm not looking for that "60K miles" trivia shit. That counts the capillaries; I'm looking for the actual veins only.

Veins+Arteries are acceptable too.

question foe /sci/

Would it be possible to get your teeth to such a cold temperature that they would shatter upon drinking a hot cup of coffee?

>No nuclear eng uni courses in my country

>This is exactly what i wish to study

What to study to branch off into nuclear eng?

OMG so random!!!!!1111111

So what do spergs think of random number theory?

For example, password/passphrase security.

Some people recommend the diceware method. Then there's this site: google: "how big is your haystack which claims to test password strength.

Here is an example passphrase from the diceware site:

strop 17 aw tete karp

24 character password from random org:

jappHzuMCtJw6TwKXqwL2BHU

33.64 million trillion centuries

0000000000000?

10.34 centuries

bullshit bullshit bullshit

35.64 billion trillion centuries

…something just ain't adding up here…

Massive Cracking Array Scenario:

(Assuming one hundred trillion guesses per second) :

1.33 thousand trillion centuries

Get in here faggots.

>>>/ironmam/

HOLY SHIT

Take a look at this, /sci/

http://www.digitaljournal.com/science/experiment-shows-future-events-decide-what-happens-in-the-past/article/434829#tab=comments&sc=0

Is this bullshit? Future events decide what happens in the past? This sounds insane.

Are black holes actually a by product of a massive singularity in three dimensional space? or are they just really dense like a neutron star? i'm curious where the mathematical representation breaks down for the actual physical one. it must have an upper and lower bound for its density and volume right?

4TH DIMENSION

What sort of biological technology do you think North Korea could possibly discover in their death camps? See http://www.theguardian.com/world/2004/feb/01/northkorea?INTCMP=SRCH.

This all assumes that North Korea is moderately okay at the biological sciences.

But I'm just curious, what sort of accelerated progress is possible with human experimentation?

Emdrive conception

Hey guys,

I would like to build a mini EmDrive. Would it be realistic and if yes, do you have advices?

How hard would DIY genetic manipulation be?

Crisper is supposed to be easy as fuck but you need to do it on germ cells to get a second generation with the alterations throughout.

How hard is it to do IVF on mice? I don't care if I have to cut up some mice to get eggs and sperm.

The goal is to gain the skills required to make cat girls so I would want to genetically modify the mice with cat genes.

What would the base level of required equipment be?

is it impossible to separate quarks?

what is the strongest base?

Rats

http://stemfeminist.com/

Comedy time /sci/

Hey /sci/ I am currently in a civil engineering technologies program in the U.S. and I was wondering instead of doing that I though about switching to petroleum engineering, what do you guys think of petroleum engineering? Does it look good in the future in terms of jobs, and it does pay better than civil eng technologies.

Does /sci/ think this is a good field to get into and is it respectable?

Im not far into the civil engineering technologies program, as im 19 atm and finishing up my first year in the fall

My foot is fucked, medical people please help

So I cut my foot open the other night, I lost a lot of blood and was taken to the hospital the next morning. I realise that I may have coagulation but I'm not sure what to do because it hurts quite a bit. I can't go to the hospital because it is currently 1 am and do not have a car and its not an emergency enough to call an ambulance.

Fun place-value / number construction games.

EMDRIVE

Please don't be the next 'neutrinos are faster than light'… I WANT TO BELIEVE, GOD DAMNIT.

Also does anyone knows if there's been some progress? Last thing I read, NASA successfully tested it in a vacumm.

tl;dr → http://www.ibtimes.co.uk/nasa-says-emdrive-does-work-it-may-have-also-created-star-trek-warp-drive-1499098

more detailed info (I don't know if it's outdated) → http://www.nasaspaceflight.com/2015/04/evaluating-nasas-futuristic-em-drive/

Is there any limit to how big a flying creature can be? At what size does flight become a physical impossibility? And I mean actual flight with reasonable dexterity, not just gliding.

Pic kinda related, largest known flyer.

Question about diseases/viruses

Hey /sci/, I come to you with a hypothetical question for a story I want to write.

A disease (or virus, I don't know exactly the definitions?) affects a few people but they are able to find a treatment or cure in time for some of them at least to survive.

The disease then mutates and affects others, much more seriously, and the treatment from before no longer works, but those that had it the first time around are now immune to it.

Does that make biological sense?

I'm doing a masters' project in compsci and need a good data center simulator. I've got CloudSim at the moment (http://www.cloudbus.org/cloudsim/) but does /sci/ know any other ones?

Apologies if this is the wrong board

while i know that alloys are a combination of various metals, how does one actually mix these combinations together?

like, how is the distribution of metals in an alloy decided upon? is it just a couple of ingots melted together, or do they have to introduce them in particular amounts in a powdered form?

Pi Day Today

How would things be different if Humans had 1 million photoreceptor cells like hawks did instead of the 200,000 that we actually have?

help /sci/. i'm too partial on the idea of being a significant contributer to science and math, but i can't decide if i want to focus on applications in technology, or to focus on theoretical frameworks that would lead to applications in the distant future.

what do i do? i am heavily inspired by the likes of dirac,fermi,planck, einstein, newton, and so forth, but others that have made advancements by applying themselves, like alan turing, have also motivated me. from this, i can't decide on engineering or theoretical physics/athematics as an undergraduate program.

Mercury

'''The levels of total mercury in hair was significantly (a = 0.05)

higher in mining zones, than Puerto Maldonado. In both areas men had significantly higher levels than women, likely due to

a difference in metabolism or varying levels of direct involvement in gold mining- a male predominated industry. This is the

first study to show the health threat that mercury poses to this region, however further research needs to be done to gain a

more refined understanding of the predominant routes of exposure in this population.'''

Just thought it would be fun to share studies about mercury. Considering it's kind of related to vaccinations I guess.

http://www.integrityresearchinstitute.org/ZPEnergy/ZPEToolkit.htm

, an aim of this study is to provide a clear understanding of the basic principles of the only

known candidate for a limitless, fueless source of power: zero-point energy. Another purpose is to look

at the feasibility of various energy conversion methods that are realistically available to modern

engineering, including emerging nanotechnology, for the possible use of zero-point energy.

anybody willing to extrapolate the information of this article? this sounds like nonsense given the conservation of energy.

Dumb science questions general

Bloodhound velocity puzzle urgently needs best engineering minds

what equation does the graph of the systems of equations solve?

x2 − 2x + 3 = 2x2 − 4x − 3

x2 − 2x + 3 = 2x2 − 4x + 3

−x2 + 2x + 3 = x2 − 4x + 3

−x2 − 2x + 3 = x2 − 4x + 3

is this entanglement? no? what is it?

if im lying between between a piece of metal and an electromagnet

what happens to my cells? is this entanglement? no? what is it?

Hey /sci/. I hate to advertise but I created a new board with an emphasis for people to post their homework problems and get help and to receive advice

>>/hwk/

I was hoping to include another sticky with links to helpful sites and to make the board grow. If you're willing to >do it for free and help some people out of boredom or interest, then come by the board. I hope to start a community where everyone can help each other with their studies.

Amateur Astronomy [GENERAL]

question for /sci/

question for /sci/

SpaceX CRS-6

First year civil engineering, stress of a curved beam

/sci/ math help

Moar Science

Can anybody explain exactly what the device in this patent is?

Gravity's Rainbow - real or fake?

Earthworms

Energy in relativity

Power legs

Quantum Physics

game time

decide my future

Engineers: HALP!

Theoretical Astrobiology Imagination Fun Time!

A Brain-to-Brain Interface for Real-Time Sharing of Sensorimotor Information

Clarification on tension and shear

ABS/Eutelsat-1

Documentaries

What made Humans dominate the Earth?

World's Simplest Electric Train

statistics

Motors and circuits

Another SpaceX Launch and Hopeful Landing

George Boole & Immanuel Kant

Med school in Europe

Internal Assessment 4 Maths

Don't die please /sci/

Are String Theories and Multiverse Theories Not Science?

How to explain evolution in a simple and convincing way

Free Educational Resources Board

Is there any actual use for magnetic monopoles?

What if we are alone in all universes?

SpaceX CRS-5 Launch with Bonus Landing

SpX/CRS-5 launch thread, in the tradition of >>712.

SpaceX is expected to launch its next space station resupply mission on the 6th of January. This will be the first attempt at a SOLID-SURFACE LANDING (on a barge downrange of the launch site) of an actual launch.

This is bigger than Space Shuttle reusability.

Microwaved Water

Muh New Species

/eng/ - Engineering

Informative Links Creation Thread

extbook Sharing: "Encounters with Chaos and Fractals"

Physics help

The "8" Lounge

Official Quantum Physics Thread #1

Rosetta

HOLY SHIT, what a move!