Dark energy is around 70% of the Universe's mass. Gravity, on the otherhand, is a force, that makes space pull stuff inside itself (not suck it in). If gravity was endless, then it would be infinity, and nobody likes infinity. So.. Dark gravity.
Melanin is a pigment, that your skin produces. It comes in many colours, which are produced by getting energy from sunlight like plants get energy from sunlight by using chlorophyl. I would call a melanin person a good person.
i have to advance in probability and i'm stuck in this frustrating question.
one Student is tested in 2 tests,the probability from him to pass the first test is 65%.and the probability for him to pass both tests is 55%,and the probability for him to pass at least one test is 80%.
the part which im having trouble with is that 80% chance ,let A be the probability to pass the first test and let B be the probability to pass the second test, now from what i understood from the given is that P(A ∩ B')+P(A' ∩ B)=80%. is that correct?
>>8152339 >I don't know jack shit about physiology, anatomy or osteology but for some reason this sounds contrived to me, so instead of finding out on my own if the evidence that backs said assumption is convincing enough, I'll snarkily share my skepticism on a Mongolian stone appreciation board
Give me a fucking break http://www.pnas.org/content/107/27/12121.long
How far is VR going to go? I feel like VR might fail, I just can't see consumers spending money on cheap ridiculous looking headsets that aren't that immersive. I believe full immersion is possible, but we need to make huge advancements in neuroscience before we can even think about creating fully immersive technology.
>>8152052 I think it's more psychological. They get so hungry that their mood goes south, they then binge and quit. You'd probably have to lock someone up to give them an all liquid diet. Also you need some vitamins and minerals to replace things that arent stored.
Does anyone here actually know how LIGO experiments work? I have some questions.
There are two detectors separated by over 2000 miles which means that two detectors can detect where the wave is coming from based on the delay.
What I don't understand is how the heck does this difference in time translate into pinpointing where the wave came from. How do they correlate wave to actual black holes? Wouldn't you need at least 3 detectors to do that?
Also, how do they know the masses of two black holes that are colliding? I'd understand if they... Comment too long. Click here to view the full text.
>>8151943 >Wouldn't you need at least 3 detectors to do that? No. If you know the signal travels at the speed of light, then a single station detecting a signal is like drawing a circle around the station. A second station draws a circle around this station. These two circles will intersect in at most two places, but one of the places will be ruled out because we'll know which detector got the signal first. Though we don't know the distance to the object which sent the signal,... Comment too long. Click here to view the full text.
>>8151831 Every time a proof exercise comes out, you can always prove it with the content of the past 3 chapters AT MOST. Usually with just the content if that chapter you will have enough to prove it.
If you stumble upon one of this and cannot prove it then it is a good indicator that the topic of the book is way beyond your intelligence and should drop it for a book of the same topic but aimed at engineers or bio majors.
Is it possible the reason we haven't met any intelligent life (capable of interstellar travel) is that once a species becomes intelligent enough they realize life is ultimately meaningless and commit collective suicide? I mean there is no other drive that makes humans tick than emotions and fear of death. Once there is nothing left to discover and there is no more fear, what is there left to do?
Are you ready for this one lads? You're about to learn a universal secret
>every black hole in our Universe is a collapsed civilization where the AI, tasked with the only logical task - that of existence itself - to reduce entropy around it, has done so in the most radical and moraleless measure possible >by collapsing everything around it into a unit of the lowest entropy, a Black Hole >the only object in space that promises the longest "existence" in the entire Universe, physically unmatched by anything else
What this means is that every civilization is bound to develop an AI. That AI will have no other task than the most important task a sentient object can develop - to exercise control over matter to prevent it from disorder and dispersion from the passive entropy. It's the sole point of life, in fact. After a while, it will have ordered the environment to such an extent that the living organisms around it will become the disorder. They will be slaughtered and their atoms assimilated into the new order of whatever its building. Soon, it will realize that there is no physical way to avoid the inevitable heat death, and in its task to prevent exactly that, it will collapse a point around it into a black hole, so all the matter and energy around it is preserved for the longest time possible, far longer than any other object in space. In it's own point of view, it will see it as completing its ultimate task.
Yes, in fact, every single black hole we find has been a sentient alien civilization that developed AI and collapsed into one. It IS the only logical step a sentient organism can take to complete its task in the Universe - the preservation of its energy (in the form of matter), over which it received administration and sentient control.
Is it because the students imagine only puppies and nice flowers when they apply for a bio degree? Or no need to use math for years, forgotting everything and then raging when you need math in research?
If biology is a natural science, it should have a mathematical foundation.
>>8151615 The people reading it will understand what's being said so what's the problem?
>The 'd' is not a variable, it's not supposed to be written cursive. By this logic the exp shouldn't be written in cursive because it's a function rather than a string of variables. If you're going to get in a hissy fit about formatting rules then at least have some consistency.
Can we have a thread devoted to self-learning things? What are you learning, and how are you going about it? Any tips?
Obviously it's really personal, but this is what works for me: >most modules have core textbooks that most uni courses will use. Borrow a copy (not a .pdf), read through a chapter, do it again, and then go through the slides from a relevant uni course, then a different one, then do all the exercises you can >make sure you fully, intuitively understand the course content >use... Comment too long. Click here to view the full text.
>Not going to the lecture >get the syllabus >get the relevant lecture video or book chapter somewhere >listen the elcture or read the chapter once >make 2-3 examples >never review or do any other example >just excel at the exam
>>8151012 economics is indeed retarded. guessing about imaginary numbers. numbers, by themselves, are already inherently imaginary. and these people try to predict things that haven't happened yet...im talking more than a two variable set of equations...like a retarded amount of retarded variables. if there were no money, there would be no middle man people could work for free they could also take for free there would be no greed because there would be no need everything is quality nothing... Comment too long. Click here to view the full text.
>identify quirk of human cognition >claim that this gives insight into the workings of the mind >ignore the fact that elementary schoolers are intentionally taught to think this way >ignore how people in 3rd world countries and animals don't think this way >develop an entire school along this strategy
Cognitive science is still a step up from psychology, though.
Who else has that niggling feeling that maybe, just maybe, quantum physics is a fucking scam that's grown too big to fail? Pilot-wave theory and vacuum as paired photons theory make so much more sense and they can explain things like like entanglement without resorting to bullshit hacks through n dimensions.
>>8150773 Weird thing is that both Quantum Field Theory and General Relativity both provide incredibly precise results for the vast majority of energy scales (read <10^6 GeV) But for some reason it still bugs me that we lose the concept that what matters are differences in energies when we go to GR
Hi /sci/ it's me again, the guy who refuses to accept the Church-Turing thesis. I've come up with a new argument for you.
If everything can be simulated by Turing machines, then this includes the subjective experience of pain. So in principle it should be possible to create an algorithm which genuinely makes the Turing machine experience pain. But this can easily seen to be absurd. Pain is by definition an experience indicating potential harm to body or mind. Now how could a Turing machine be hurt? By it's own definition there is no way to destroy parts... Comment too long. Click here to view the full text.
>>8150639 I don't get this argument at all. Pain is no different from any other sensory inputs. A strong enough neural impulse will kick in a hardwired instinct, you don't need to "learn" pain. If you design a machine to feel pain, it will feel pain.
Can you explain the accounting for a subjective experience part a bit more?
Why are the mathematical models of particle physics so complicated?
In order to calculate the motion of a single particle we have to take into account a literal infinity of contributions of virtual particles and field interactions etc. How can there be so much stuff happening down there?
Could it turn out that this picture is mostly a mathematical fiction? It reminds me of the epicycles of the geocentric model of the solar system. When the sun was put in the centre the equations became much simpler and more closely modeled the actual physics. Could a similar thing... Comment too long. Click here to view the full text.
If the only goal of evolution is for an organism to survive and reproduce in its environment better why have organisms become so much more complex over time? Can anyone really make the case that complex organisms humans are better fit to survive their environment than bacteria and other prokaryotes?
Complexity arises from biotic stress, e.g. competition between organisms. Limited resources "force" organisms to use same resources more optimally or find new resources. Finding new resources and new ecological niches requires often more complex behavior than just reproducing every 20 minutes.
A two-trick pony is more likely to gain more resources than a one-trick pony. A three-trick pony will beat them both at gaining resources. Increasing the organism's ability to make more complex structures and functions demands cooperation between cells, and that's... Comment too long. Click here to view the full text.
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