How can I teach myself advanced mathematics?
Start reading.
>>8178917
/thread
>>8178438
Learn how to do Barnett triple integrals
In a thread about important scientific issues that aren't being worked on, one of the first posters >>8175134 identified 'legit penis enlargement' as such a problem.
In this thread, we discuss how to solve his problem - and how to make a fortune in the process.
> source for pic http://www.bjuinternational.com/bjui-blog/normal-review-analyzes-data-flaccid-erect-penis-lengths-men/
Suggestion: lab-grown penises created from the patient's own tissue (no anti-rejection meds needed) https://www.theguardian.com/science/2014/oct/05/laboratory-penises-test-on-men
>>8175807
>lab-grown penises created from the patient's own tissue
Why would they be significantly different in size from the original penis?
>>8175819
Because you grew it so you decided the lenght ?
Preety pictures: OC edition
Freshly recrystallized benzoic acid
>>8169699
While we're on the theme of recrystallization, here's some sulfur
>>8169711
Well with the benzoic acid I used water and for the sulfur I used toluene (but xylenes would also work)
A Brief Overview of Cosmology.
As requested, I have returned in order to dedicate a thread to this topic.
Now I'm assuming you know that the universe is expanding uniformly as informed by the Doppler effect, spectrometry allows us to discern the composition of massive bodies, both light and gravity dissipate at 1/R2, velocity is proportional to distance and the number of proportionality is H and the expansion rate is measured against standard candles, such as supernovae.
v = Hd
H = 100h km/sec/Mpc
If not, then now you do.
Ok, on with the thread!
>>8184499
As a quick reminder and introduction, let’s take a look at gravitational energy and the Earth:
If a coin is flung up into the air, how do we determine whether it will escape the atmosphere or return to Earth?
Et = ½ mv^2 - GMm/r
Total gravitational energy is equal to kinetic energy minus potential energy; positive energy minus negative energy.
Et >0 = escape
Et <0 = return
We can determine the escape velocity of the Earth using this equation, which is 11km/s.
This method can also be used to determine the gravitational energy of a galaxy and its ultimate fate:
A.E motion ≈ v^2 ≈ H^2 (+)
B.E gravity ≈ M ≈ ρ (density) (-)
B/A >1 = collapse
B/A <1 = expand forever
>>8184501
Now, let’s determine the gravitational energy of a galaxy of mass m at the edge of a region with radius R:
Et = ½ mv^2 - GMm/r
We can multiply both sides by a positive number without changing anything and divide by m, as m is also a positive number, so we’ll multiply by 2:
2/m Et = v^2 - 2GM/r
As the velocity of a galaxy at a given distance is proportional to the distance, and the constant of proportionality is H, then v^2 is equal to H^2 R^2.
Now, what is the total mass of a sphere with radius R?
Well the volume of a sphere with radius R is 4/3 π r^3 and as the mass of a sphere with radius R is equal to volume times the average density, then we can write the equation as:
2/m Et = H^2 R^2 - 2G [(4π/3) ρR^3] /R
In order to further simplify, as R2 is a positive quantity we can divide by it, which leaves us with:
2/mR^2 Et = H^2 - 8 πG/3 ρ
Now, let’s refer to the constants 2, m and Et as minus kappa, so that 2/m Et is represented by –k:
-k/R^2 = H^2 - 8 πG/3 ρ
This is Einstein’s equation for an expanding universe, derived with all the factors of π and 3, which will ultimately determine the evolution of the universe.
Minus kappa is a constant related to the total energy of the galaxy, which in general relativity is the curvature of the universe..
>>8184503
The nature of the expansion of the universe is dependent on its curvature..
Therefore, if the total energy of the galaxy in question is positive then kappa is negative, which indicates that it will continue expanding infinitely.
If the total energy is negative then kappa is positive, which indicates that it will collapse.
However, if the final value is zero then it will continue expanding, slowing down but never quite stopping, so that at ∞ v = 0.
The same is true of the universe as a whole.
Now, in order to determine the total energy of the universe we must determine the density of the universe and measure it against the critical density.
If the density of the universe is equal to the critical density then the universe is flat.
If it is greater than the critical density then the universe is closed.
If it is less than the critical density then the universe is open.
The critical density of the universe will be defined by ρc.
ρ > ρc = closed universe
ρ < ρc = open universe
ρ = ρc = flat universe
ρ/ ρc = Ω
Ω = >1 = closed universe
Ω = <1 = open universe
Ω = 1 = flat universe
Ω = >1 = collapse
Ω = <1 = expand forever
Ω = 1 = expand forever, slowing down but never quite stopping so that at ∞ v = 0
A flat universe for example, would therefore be defined as:
0 = H2 - 8 πG/3 ρc
The majority of people seem incapable of engaging in (informal) logical reasoning, including notable scientists like physicist Michio Kaku.
In this interview he repeatedly refuses to address the questions of the host, which are presented in a neutral tone, and then uses rhetoric in an attempt to discredit her.
The comments are almost unanimously supportive of Kaku, indicating that the majority of viewers are unable to differentiate between logical reasoning and rhetoric.
https://www.youtube.com/watch?v=sdGOrWmVMv8
Here’s a shortened and paraphrased transcription, with the host in greentext and a simplistic logical analysis:
>Do you think modern democratic states provide an illusion of control and agency, in place of actual democratic power?
Kaku: Name a better system than democracy! (missing the point)
>I’m not arguing against democracy, I’m arguing against the appearance of democracy.
Kaku: There’s no such thing as a perfect democracy… the Greeks had slaves for god’s sake! (reframing the question)
>That’s a very American argument. (It’s also an irrelevant argument)
Kaku: It’s THE argument!
>I don’t want to argue with you…
Kaku: That’s what democracy is about! (Rhetorical and logically fallacious arguments?)
>When George Bush took America to war, Congress wasn’t consulted; the democratic process was subverted…
Kaku: The fact that you can sit there and even say something like that is testament to how far we’ve come… (missing the point/completely irrelevant)
Kaku may be a proficient theoretical physicist, however he seems completely unable to engage in logical debate.
>>8175971
it may be surprising to you that autistic people will panic in social situations
You should exclude Kaku in any scientific context after he came out and said quantum physics proves God.
>>8175971
You people fail to see his points. He is thinking 3 steps ahead of interviewer, and attacking the points that naturally follow if one would ask the questions he was asked. Its normal to do this if you are very smart and deep thinking person.
But they could argue over ''appearance'' of democracy I guess hahahahaha which serves no purpose.
That's the difference between being smart and trying to appear smart, than falling back on semantics when confronted.
Michio Kaku IS God.
Also thanks for greentexting.
what is the answer /sci/?
>>8178915
1 kg. Are you retarded or something ?
>>8178920
It's .5kg you brainlet.
>>8178924
Explain your reasoning, at least
ITT: Engineers
p-please let me suck your dick ..
>>8182932
Engineers can do photosynthesis?
>>8182932
Hey guys, I contribute to society on a daily basis and make bank doing it.
What's the easiest way for a singular person to bring about the death of humanity?
Would dedicating your entire life towards digging a giant hole and then spending all of your life's savings and pay-dirt on gunpowder then DROPPING it in the hole into the earth's core do anything?
>>8181889
not time sensitive, become a spy and start lies that cause a nuclear war
>gunpowder
even a nuclear bomb dropped directly on the earth's core wouldn't do anything, it was just be absorbed into the mantle.
>>8181889
Absolutely not. Take this to the stupid questions thread.
This is the single most idiotic question I have ever seen. Honestly how fucking stupid do you have to be to think dropping gunpowder into a hole would fucking bring the death of humanity...
Ok, /sci/, who is the smartest man who ever lived ? Who is it ? And how did he contribute to this world ?
define smart
jacob barnett
Post your face when it turned out most neuroimaging research results from the past two decades belong in the trash.
http://www.pnas.org/content/early/2016/06/27/1602413113.full
>Functional MRI (fMRI) is 25 years old, yet surprisingly its most common statistical methods have not been validated using real data
>In theory, we should find 5% false positives (for a significance threshold of 5%), but instead we found that the most common software packages for fMRI analysis (SPM, FSL, AFNI) can result in false-positive rates of up to 70%
>a 15-year-old bug was found in 3dClustSim while testing the three software packages (the bug was fixed by the AFNI group as of May 2015, during preparation of this manuscript)
>It is not feasible to redo 40,000 fMRI studies, and lamentable archiving and data-sharing practices mean most could not be reanalyzed either
>>8184578
fMRI is shit ? Wow, who knew !
Seriously, it was always considered shit, at least in serious biology fields. Bug or not, it's far from a serious and objective tool.
>>8184582
>most widely used technique in its field
Who knew indeed.
>>8184606
Neurofuckers couldn't admit that their super new toy that can see perfectly finethebrainactivityIswearguys is biaised and worthless.
Technocratic republic of /sci/ fucking when?
>>8182308
>Day 0: /sci/topia is founded
>Day 1: Government is instantly split because all the high IQ faggots who were allowed to stand for office can't stop arguing over basic definitions
>Day 2: Civil war erupts between those that think that discussion of qualia should be outlawed as pseudoscience, and those that think "it's totes legit, dude".
>Day 3: 90% of the population are dead after some AnCap faggot thought it would be a good idea to sell nuclear weapons to both sides
>Day 4: The remaining 10% try to rebuild, and finally notice there are no woman in /sci/topia
>Day 5: Experiment abandoned, everyone returns to their previous lives.
>>8182316
>Day 4: The remaining 10% try to rebuild, and finally notice there are no woman in /sci/topia
>tfw I'm transgirl
>tfw that doesn't count since still can't bear children
>>8182319
This isn't your blog, faggot.
Is sentient AI possible?
sure, why not?
>>8180316
I hope so
>>8180316
You wouldn't be able to distinguish it from non-sentient AI programmed to pretend that it is sentient.
are we in a simulation?
>>8170049
Don't beg the question B^)
>>8170049
"Dubito, ergo cogito, ergo sum."
>>8170049
Yes we do live in a simulation
Dumb question, but what's the name of the sun?
>>8179848
the sun
>>8179848
Jeremy
>>8179848
Sol
WHY IS NOBODY TALKING ABOUT THIS
THIS IS HUGE.
THOUGHTS? FEARS? CHANCES?
>>8182925
easier said than done
>>8182925
You shouldn't be worried about CRISPR/CAS9. You should be worried about gene drive using CRISPR/CAS9
https://en.wikipedia.org/wiki/Gene_drive#CRISPR.2FCas9
>tfw humanity can now fuck up an entire species with minimal effort.
It's hilarious how frightening this is, I was reading a proposal to use the two to turn all mosquitoes male.
>>8182938
The scary thing is that it really IS that easy. We might not be that far away from artificially genetically enhanced humans already
