Archived threads in /sci/ - Science & Math - 120. page
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Opinions?
http://www.nature.com/news/has-a-hungarian-physics-lab-found-a-fifth-force-of-nature-1.19957
>>8101286
You mean the sixth. The fifth is love.
>>8101286
Sure, why not?
Let's wait for outside verification And replication before Nobel prizes are given out.
It's not Telegraph or any of the other usual suspects for mega popsci, and it's not some bullshit "It's THE FUCKING FUTURE NOW" article either.
10/10 would be intrigued again.
Why the hell is chemistry so fucking inexact, /sci/? I'm studying salt solutions and every two seconds the book makes a new approximation because fuck you that's why. It's fucking rage inducing.
that's how all fields work, deal with it.
>>8101282
I'm not having the same issues with maths or physics though. Everything there is explained, every formula. Instead chemistry just tells you to do this then do that then do that without really explaining what the hell is going on
>>8101294
>he thinks physicists never make simplifications
k
ever noticed how you only study ideal situations?
Obviously I don't have any mathematical or scientific training or whatever so this could very well belong to a sqt, but isn't basic algebra (probably not a proper math object) supposed to be transitive? Like if a=b and a=c then b=c? Then why is (-b+(b^2-4ac)^(1/2))/2a) ≠ (-b-(b^2-4ac)^(1/2))/2a) even though they both are equal to ax^2+bx+c=0)? Also there's the if a=b then a+-*/c=b+-*/c property. It doesn't hold for "x=7 then x/(x-7)=7(x-7)" Does this mean math is broken? Do we just patch it up because it's useful irl? Doesn't the fact...
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>>8101179
You can't equate an expression with an equation.
>>8101179
If we take b=0, a = -1, and c = some positive number, then your question translates to
"if (-1)*x^2 + (0)*x + c = 0, and if x = ((-(0)+((0)^2-4(-1)c)^(1/2))/2(-1)) or ((-(0) - ((0)^2-4(-1)c)^(1/2))/2(-1)) , then shouldn't ((-(0)+((0)^2-4(-1)c)^(1/2))/2(-1)) = ((-(0) - ((0)^2-4(-1)c)^(1/2))/2(-1)) be true? No, if x is this number, OR that number, it does not mean it is this number AND that number.
What exactly happens in your body when you reach your breaking point?
How does mental and physical exhaustion differ?
And how can you know what your true and imagined breaking point is?
Examples: when I am running and feel the urge to stop but keep going on until I feel like I just have to stop. Was this my phyiscal or psychological breaking point or was it neither? Could I still have went on for longer? What prevented me from it?
Similarly when studying and I just feel too tired to focus. What exactly is it that prevents me to study for another...
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>>8101085
pratice helps build endurance in almost all things. To answer your question it's a bit of both it's a safety guard/device in your mind and body to not over exhaust anything. Just listen to it and don't push yourself to hard you will probably won't amount to anything anyway.
>>8101093
>will probably won't
inhale propane
I'm not at all sure if this question is too asinine or not, but I wanted to ask /sci/ about the relative pro's or cons of transport by pipeline as opposed to transport by rail or road or other vehicle.
Whenever a resource is available as a fluid, it's generally transported through pipes. We rarely see companies extract oil from the ground and then truck it from place to place. Similarly with water, it's delivered via pipe, as it's cheaper.
So I'm wondering, say we fluidised the worlds largest traded solid resources, i.e., convert...
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>>8101083
The biggest (of many) problems with this approach is that melting say, iron takes a fuckton of energy. And you have to heat the entire length of the pipe enough to _keep_ the iron liquid, or else it's just going to solidify a mile down the pipeline.
>>8101087
The post mentioned that resources like iron would be fluidised by conversion to an aqueous salt like a sulfate or nitrate, and then transported by being dissolved in water. No molten metal needed; I'm thinking more of an add on to existing water distribution networks with a system of refining out the bulk goods before the waters use for drinking or agricultural purposes. Perhaps I should have been clearer on this point.
>>8101083
>how would a theoretical, untested and unproven method of transportation for goods, which doesn't even yield results in google, fare against the established methods of transportation of goods, for which actual data exists
if you want a clear answer:
how the hell are we supposed to know
if you want an uneducated, speculative answer based on nothing but vague assumptions:
maybe
What does /sci think about Lasik? Is it really the holy grail for 20/20 vision? What are the chances of becoming blind from that surgery?
>get laser eye surgery
>eyesight good for a few years
>eyesight degenerates again
>can't get laser eye surgery again
>>8101105
You can do infinite laser surgeries.
Why is it that you can't have laser surgery more than once?
What is the best dietary approach for improving intelligence and attention span?
Eating 10-60mg of amphetamines daily.
Olives
Olive oil
Feta cheese
Walnuts
More olive oil
Sardines and mackerel
Avocado
More olives
Homemade bread (with non shit flour and no sugar)
Mediterranean and middle eastern spices
Olive oil
Cottage cheese
Onions and garlic
Greek/Turkish coffee (make it yourself. Use this method because it takes patience, which makes sure you don't abuse it)
Did I mention olives and olive oil?
Other fatty vegetables and fruits and nuts
Meat no more than once a week
Fish no more than twice a week
Love and worship the olives and walnuts
>>8101065
Why is fat supposed to be good for you? Got any studies to back up your claims?
Just got done watching
https://www.youtube.com/watch?v=ZL4yYHdDSWs
This video doesn't say why we'd be limited to the local group.
According to google, space is expanding at 74.3 km/s/megaparsec. Things just over 13 billion light years away are moving away at faster than the speed of light.
Also, since at all distances closer than that the expansion of space would be less than the speed of light, the fact that space would be expanding while the light was traveling should not matter.
Sure light that we see may be from things that are...
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>astrophysics
This whole video is kind of pointless because it only accounts for our current understanding of physics which will undoubtedly change drastically by the far future relevant to this video. It's entirely possible that we will be able to bypass the speed of light or even leave this universe if there is such a thing as multiverses.
Is it possible to freeze yourself and wake up in the future?
Its probably not imbossible, but for now noone done this succesfully, so dont try this at home.
>>8100973
only if you can freeze very swiftly, otherwise the ice will tear your cells to pieces
and then if people manage to un-freeze you gently and restart your heart you will be fine
>>8100991
wouldn't that disturb the bonds in molecules?
Suppose I have a categories [math]C, D[/math] and a functor [math]F:C \to D[/math].
Is there a formal construction for the category of objects of [math]C[/math] decorated with the objects of [math]D[/math]?
>>8100871
Sci isn't for homework, kiddo.
>>8100906
This aint homework, undergrad.
>>8100909
>asks an undergrad question
>uses "undergrad" as an insult
Evolution is often spoken of factually, but in fact only changing the properties (as opposed to the nature) of descendants is directly observed; this is nothing new, breeding has been done for thousands of years. Evolution is the theory that this can eventually lead to new species. Yet speciation has never been directly observed, only inferred. All the examples of it being observed, are based on mating preference, not innate incompatibility; by this standard, Ethiopians and Greeks of ancient times were different species, since they did not mate with each other.
Also,...
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>>8100563
>Yet speciation has never been directly observed,
Yes it has. It's actually fairly common in insects.
>>8100599
Nope.
>This is a simplified model of speciation by geographic isolation, but it gives an idea of some of the processes that might be at work in speciation. In most real-life cases, we can only put together part of the story from the available evidence.
http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_42
>>8100607
>In most real-life cases, we can only put together part of the story from the available evidence.
>In most real-life cases
>most
Do you enjoy shooting yourself in the foot?
Post a subject or skill that everyone should be a master of in your opinion.
Mine are:
Philosophy (Ayn Rand's Objectivism)
Logic
Math
Personal Finance
Basic Economics
Nutrition/Body Health
Computer Programming
And build your specialization on top. Why computer programming? Because computers are huge value creators relative to price/energy expended.
>>8100353
>Philosophy (Ayn Rand's Objectivism)
so that everyone can see just how batshit and retarded it is?
>>8100353
Ayn Rand is not a significant philosopher, and Objectivism is wildly anti intellectual lighthearted nonsense.
I've started thinking lately that we're actually in the [math]\pi[/math]'th dimension and quantum theory is a result of us realizing those extra pieces of our fractal dimension. In the infinitely many other fractal dimensions on [math](3,4)[/math] the ratio of the circumference of a circle to its diameter would not be 3.1459265... and the limit [math]\lim_{x\to\infty} (1 + 1/n)^n[/math] would evaluate to something other than 2.7182818... but most likely [math]e^{i \pi} = -1[/math] would still hold for the new values of [math]e, \pi[/math].
discuss.
>>8100308
>I've started thinking lately that we're actually in the ππ'th dimension
Prove it or fuck off
>>8100308
Reading this post will keep me a way from /sci/ for a while (thank god), because this is most fucking retarded thing I have ever read here.
>>8100308
The very least we know is that we live in something that is well described by 4D spacetime, per experiment. This does not preclude the possibility that has more than 4 dimensions (some advanced physics theories require up to 11D), but if there are more than 4 dimensions it is not obvious how they manifest themselves.
Some physicist have considered universes with different numbers of spatial dimensions and time dimensions, and while some of the arguments are suspect, the case has been made that there aren't...
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Like as in, the least-efficient or the one most needing of repair or maintenance, the one that breaks the most
my heart
>>8100288
Unless u have heart failure its probably actually a pretty good machine desu
>maintenance-free pump that works 70+ years nonstop
>blood is thicker than water
Do plebeians really think mathematicians try to add/multiply/divide numbers in their head all day?
No, they think mathematicians try to find new mathematical problems to solve all day or review and discuss older mathematical problems with other mathematicians.
>>8100176
>they think ACADEMICS OF FIELD try to find new FIELD OF STUDY problems to solve all day or review and discuss older FIELD OF STUDY problems with other ACADEMICS OF FIELD
this can be said of any field and still be true
>>8100169
OK fellas, I'll bite.
What DO mathematicians do all day?
(besides browse /sci/)
