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Archived threads in /sci/ - Science & Math - 221. page
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Why am I me?

Why was I not born a Pterodactyl in the Jurassic Period 200 million years ago?

Why was I not born as a termite in the 15th century in Western Europe?

Why was I not born in another galaxy far away, on another planet capable of supporting conscious life?

Why am I not a jellyfish, RIGHT NOW, in the ocean?

Why am I alive right now? Shouldn't I-statistically speaking-be dead right now? How many lives have come before me? Trillions upon trillions upon trillions (if you take into account all life in the universe). So why right now?...
>>
>>8229977
>statistically
stfu
>>
Science is a subset of philosophy, I think this board is for science and math (and occasionally the mathy parts of computer science) and not the other parts of philosophy.
>>
>>8229982
Can this problem not be approached empirically?

Why do this just get swept under the rug and elicit nothing more than a muttered
>uh...Idunno..
and a shrug?

I can't find anything substantial on the internet about it despite it being one of the most important questions that can possibly be posed.

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I don't know if this belongs here but I was taking a picture of the moon last night (multiple, actually) and the little glowing circle kept showing up no matter where I took it.

tl;dr what is that next to the moon plz
>>
It's either a ufo or a reflection due to shitty optics and overexposure.
>>
>>8216936
all for UFO ggwp
>>
Are you dumb? Is clearly an ayyy lmao spaceship

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So what the hell is the difference between all of these things?
>Does not exist
>empty set
>indeterminate
>undefined
>0/0
>c/0, {c|c=/=0}
Are any of these things the same?
>>
Does not exist = is an element of the empty set

Empty set = The unique set without any members

Indeterminate = cannot be determined

Undefined = is not defined/does not have a definition

0/0 - division by 0 (this is an example of something that is undefined)

C/0 - division by 0. An undefined.
>>
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>>8216929
so would it be correct to say

lim x=>0 (|x|/x) = {}

or instead of = use the pic related
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>>8216939
Jesus Christ no

How would First contact go about: Between human and a alien that is able to communicate back?
>>
Ayy lmao
>>
>>8216772
I wonder how they would interact with a species that only talks in meme's
>>
>>8216769
You mean actually conversing between the two species? Why would that happen?

Why are cats not scared of insects? Should I get one to watch my house?
>>
cats are predators that hunt insects.
yes, get a stray one or adopt.
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>>8216322
size difference

it's why elephants are afraid of mice too
>>
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>>8216326
This.
Cats will seek and destroy insects, bees, wasps, mice, bats and any kind of pests or vermins they can get their hands on.
They will also try to kill your in your sleep but its okay cuz they're cute :3

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how could one create a permanently floating building or town?

buckminster fuller proposed a huge lightweight geodesic sphere, lift by hot air. But it would have to be enormous

budget within 10 billion (aka, 2/3 the cost of 3 gorges dam)
>>
Permanency doesn't meaningfully exist, especially on a macro scale.
>>
>>8216216
Why? So it could float around and drop shit all over everything underneath?
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>>8216225
This. There might come a point when you want the thing to just fuck off.

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been interested in learning programming, looked at the /sci/ wiki but i didn't think any of the books were what i was looking for.

any book recommendations would be helpful to get me started. also any recommend languages to learn, I've learnt some python and know enough to make beginner programs.
>>
depends on what you wanna use the programming for

>>
>>8216168
i guess i haven't thought about what i would use it for, but say i was to go into statistical programming with languages like SAS is it better to start with SAS or something else?
>>
to learn the fundamentals of actual programming, like how to think about programs in an intelligent, wise way: SICP. it's an excellent introductory textbook to programming

>statistical programming
learn R

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Is Khan academy actually a meme? Or is it actually useful for someone like me who hasnt done any calculus and only has a grade 10's (Australia )understanding of math. Is it worth going through and completing the world of math? and then even further and doing physics and chem as well? Then transfer into books?

Or am i better off just going with text books and what I can find on google? Help a mere dumbkunt here please.
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>>8216037
Your understanding of education is limited to whether or not something is a 'meme', so it's unlikely you'll benefit from it.
>>
um it's worth if it makes you practice and learn
it's not worth if you're gonna spend time here questioning it
>>
>>8216037
Your understanding of education is limited to whether or not something is a 'meme', so it's unlikely you'll benefit from it.

Does IQ determine how successful you are in the future?
>>
Doll=Bat=Snail>Snake>Bird=Cat>Monkey=Bee>Reddigahara>Spook>Math
>>
IQ has a correlation of 0,3 with success.
Conscientiousness has a correlation of 0,3 > x < 0,4
The rest is socioeconomic with 0,3-0,4
>>
If you don't appreciate lolis, your IQ is automatically in the negative range.

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${\bf Why~is~the~human~eye~so fucking~cool?$

Direct detection of a single photon by humans
>http://www.nature.com/ncomms/2016/160719/ncomms12172/full/ncomms12172.html

>>
>>8215238
I read the paper, that's actually pretty neat.
>>
photons don't really exist, they are just an abstract concept to represent action at the distance with particles
>>
>>8215238
that was quick, it's been out for less than half an our.

I know optogenetics is what's really big in Neuroscience right now, but I don't like researching on rats. Decapitating and collecting the brains of rats really messed with me, and I still feel kind of sick when I was holding that guillotine...

I'm not against animal research, just feel weird doing it. Maybe I'm pussy and should suck it?

Anyways, my question is this: I know in the future EEG and fMRI research will be superseded or won't be as popular. I feel like we've got most of the experimental data possible from those 2 paradigms...
>>
>>8214767
>suck it?

Meant to say "suck it up". I am tired, it's late. Ignore typos.
>>
>>8214767
do neuroscientists... eh... decapitate the rat themselves?
>>
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>>8214986
Yes with a guillotine.

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Why do people troll? Is there any one reason, or is that like asking "why do people steal?" Is there any hard science to back up the motivations of internet trolls?

>>
>
>>
>>8210239
I personally believe that people troll because humans are attracted to deception. Lying and getting away with it is fun or funny to many people. Lying on the internet is easier and therefore more fun.
When people troll, its a form of malicious deception.
>Haha you thought I was stupid but I'm actually smart
>Haha you're getting mad over something stupid because I made it up haha
>Haha you only think I'm a troll...
>>
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In the days of old 4chan it use to be the way of sorting out the newbies and summerfags from the regulars. Everyone but the regulars would get angry, frustrated, or confused and fuck the right out of the secret clubhouse. The regulars had a weird love/hate relationship with extreme trollers with the most extreme becoming heros or anti-heros of sorts for keeping the hordes of normies in their place. Eventually 4chan got the reputation that's it's a place for trolling and attracted lots of people who just wanted to act dumb and draw attention to themselves. With lots...

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If Pilot-Wave Theory (e.g. Bohmian Mechanics) is proven to be experimentally correct? How come the majority of Physicists still accept Quantum Mechanics? Isn't Quantum Mechanics just a lazy theory, because it relies on randomness to explain what we don't yet (or refuse to) understand? Bohmian Mechanics is deterministic, and it still satisfied Schrödinger's wave equation.
>>
You cant prove anything to be physically correct.
The only thing you could do is falsify a theory, which hasnt be done for qm yet.
Fuck determinism and the copenhagen Interpretation. Quantum coherence is way to go.
>>
>>8226483
One of the benefits of science is the ability to make inferences from previous data. A deterministic approach is far more reliable at getting accurate results than a non-deterministic one.
>>
qualiantum mechanics :)

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>2016
>still no cure for depression
Science, I am disappoint.
>>
>>8227524
there is, drugs
>>
Live in a country where just being alive is good enough.

>>
>>8227524

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One day Shizuo Kakutani was teaching a class at Yale. He wrote down a lemma on the blackboard and announced that the proof was obvious. One student timidly raised his hand and said that it wasn't obvious to him. Could Kakutani explain?

After several moments' thought, Kakutani realized that he could not himself prove the lemma. He apologized, and said that he would report back at their next class meeting.

After class, Kakutani, went straight to his office. He labored for quite a time and found that he could not prove the pesky lemma. He skipped lunch and...
>>
was it alzeihmers?
>>
>>8226020
>>
In the early sixties, Grothendieck visited Harvard while Zariski was still a faculty member. Once, while Zariski was lecturing in a seminar, Grothendieck kept asking him why he didn't prove his result for all schemes, not just varieties, but Zariski simply responded that it didn't work. Eventually, Grothendieck could stand it no longer and went to the blackboard and began writing down a proof for schemes. While he did so, Zariski wrote down a counter-example. When Grothendieck realized he was wrong, Zariski said (in his heavily accented Russo-Italian English) "In...

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Say someone were to eat a goat that had cancer.

Is there any evidence this would be bad for the person eating the goat?
>>
Yeah, putting cancer cells into your body. What could go wrong.
>>
>>8224879
Literally nothing. Cancer is not like bacterias or viruses
>>
>>8224879

They're not YOUR cancer cells, though. And they'd be dead and cooked.

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Who was the first human?
>>
>>
>>8224526
>>
>>8224526
There was no first human.
https://youtu.be/xdWLhXi24Mo

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A : Consciousness is a byproduct of the electrical feedback in a neural net and completely a materialistic concept ; Which means an AI when gets sophisticated enough, is conscious.

B : Consciousness is a spiritual concept and exclusively found in humans / animals ; Therefore an AI or anything synthetic will never have consciousness

C : Consciousness is an illusion as in the viewer (you) are the god, the observer and everything there is and everything else is (you)r imagination : Means that no consciousness is truly real.

It's time to make a decision...
>>
>>8227054
Honestly, we only have indications. A is the closest we have.

But that's just what we think. We could be doing post hoc ergo propter hoc all the time with the brain, as it is the only thing we cannot really take apart to study the same way we can with a lot of other things. We need to see the reactions while they happen which we can't because they're in our heads.

B and C are nonsense until proven otherwise, I don't really believe in B but I believe consciousness and the soul are...
>>
>>8227091

>I believe consciousness and the soul are separate entities that don't interact at all
>soul

nigga, wat?
>>
>>8227091

>as it is the only thing we cannot really take apart to study the same way

Lol.

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ITT we discuss common misconceptions that lay-people tend to have about some non-elementary mathematical concepts

>an infinite, non-repeating string in some language necessarily contains all finite strings in that language
This is typically used to assert that the decimal expansion of pi contains all finite strings of numbers from 0 to 9, even though this is currently an open problem. Also, people making this misconception tend to do so with complete certainty, and I'm extremely...
>>
>>8217522
>an infinite, non-repeating string in some language necessarily contains all finite strings in that language

This is so idiotic

If that was true, then at some point you have chunks of a trillion numbers repeated

imagine when, in our calculations, we reach that point, and assume that we found a period for pi
>>
>>8217522
>it doesn't contain the finite string '11'.
but you can define

00 to be 0
01 to be 0
10 to be 1
11 to be 1

and now you can find the string 11
>>
>>8217522
>common misconceptions that lay-people tend to have about some non-elementary mathematical concepts
0.999 = 1

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I will start.

Use the Mayer-Vietoris sequence, $\ldots \to {H^i}\left( {X,\mathcal{F}} \right) \to {H^i}\left( {U,\mathcal{F}} \right) \oplus {H^i}\left( {V,\mathcal{F}} \right) \to {H^i}\left( {U \cap V,\mathcal{F}} \right) \to {H^{i + 1}}\left( {X,\mathcal{F}} \right) \to \ldots$, to prove that ${H^1}\left( {{S^1},{A_{{S^1}}}} \right) \cong A$ for any abelian group $A$.
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>>8222605
Cohomology with values in what? A sheaf of abelian groups? What is $A_{S^1}$?
>>
>>8222622
>What is ...?
The constant sheaf associated to A.
>>
>>8222605
What is the geometric picture that you have in your head for the lie algebra associated to a lie group (assuming you can picture the manifold structure of the lie group, like the simple case of S^1)?

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What are the best youtube channels for current events in science??
>>
I am trying to get a bachelor's degree in Computer Engineering. I actually wouldn't mind teaching at the community college level. I heard that one only needs a Master's degree to get a teaching job. Anyone know what I should do to get hired at the community college level? Do CC even want Engineering graduates?
>>
>>8216652
jstor and arxiv

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Is there any evidence that dragons existed on earth? Is it possible for a dragon to exist at all?
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>>8226222
Define "dragon"
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There is no evidence at all. What type of dragon are you talking about? Like fire-breathing ones?
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>>8226223
fire breathing flying lizards that terrorist european vilalges and eat humans

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>playing chess helps develop creativity by activating the right side of your brain
>>
It increases intelligence, but so does any complex problem. Nothing special, just popular.
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>>8220824
I'm aware of the fallacy, although the question still remains, do you think it can improve intelligence say more than dual n-back or bilingualism?

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>be in college
>take differential equations
>get test back
>pic related
Is it normal to get penalized for not showing work for the quadratic equation and the auxiliary equation? Nobody knew we were suppose to show the work. At least two other people in a class of 10-15 people got heavily penalized for not showing the same. Is my college a meme?
>>
>>8228070

No but your teacher is a dick
>>
>>8228070

It is simple:

Step 3) ???
Step 4) Profit

Showing your work is beneficial for two reasons: partial credit and telling your grader that you know what the hell diff. eqs. are. Otherwise how do you prove that you didn't cheat?

If I got a complaint like OP's, I would tell that student to retake the exam in my office while I watch him.

kill yourself my man.
>>
>>8228070
When in Rome

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WHY are there laws of nature?
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>>8225645
Because our universe - imagine it as multiple geometrical shapes with different colors each - going trough each other - our universe is something random there - but if the triangle would be just a little down the universe wouldn't have enough dark energy, nor no law of gravity at all ... and the big bang - activated every single combination and we are one of the boom.
>>
>>8225645
What would it be like if there weren't laws of nature?
>>
>>8225645

Because quantum fluctuations.

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What is consciousness?

In each 7 years all atoms of our bodies changes completely. There is not a single atom in commom in your body today as in 7 years ago. So are you a different person? The kid died? If consciousness is just chemical reactions, how can it be constant if the atoms were changed?

If something clones every single atom of you and paste it by your side, the clone will be you? Will you feel his existance, too? Both of "you" will feel each other existance?
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>>8222550
Your brain cells don't regrow, and they don't get replaced
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>>8222550
>If something clones every single atom of you and paste it by your side, the clone will be you? Will you feel his existance, too? Both of "you" will feel each other existance?

Of course this is pretty much proven due to experimental verifications of Quantum Entanglement.
>>
>>8222648
>proof
hahahahaha

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Is proving 1+1=2 the hardest problem in mathematics?
>>
>>8219896

troll?
>>
Ok, the proof starts from the Peano Postulates, which define the natural numbers N.

N is the smallest set satisfying these postulates:

P1. 1 is in N.

P2. If x is in N, then its "successor" x' is in N.

P3. There is no x such that x' = 1.

P4. If x isn't 1, then there is a y in N such that y' = x.

P5. If S is a subset of N, 1 is in S, and the implication (x in S => x' in S) holds, then S = N.

Then you have to define addition recursively...

Def: Let a and b be in N. If b = 1, then...
>>
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>>8219914
>being this new

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>>8224296
A deck of 52 playing cards is shuffled and placed facedown on the table. Then one, at a time , the cards are dealt face up from the top. If you were asked to bet in advance on the distance from the top of the first black ace to be dealt, what position (first, second, third, ...) would you pick so that if the game were repeated many times, you would maximize your chance in the long run of guessing correctly?
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>>8224317
First position?

@@@@possible spolier@@@@
To win the game you have to guess the right position of a black ace and the other ace must come after it.
The odds for one to guess the right position of any black ace is not influence by the position you pick, it will always be 1/26, but the chances that the other black ace comes after your bet is maximised when you bet the first position (it's 100% in this case. If you were to pick the 52. Position, then the chances you'd Winn would be 0). So I'd...
>>
>>8224296
>>8219670

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'sup /sci/

I found this paper that studied the effect of an ADHD drug on the brain activity of 'normal' people:

Some highlights:
>We pharmacologically increased synaptic catecholamine levels and measured the resulting changes in intrinsic fMRI functional connectivity.
>atomoxetine reduced the strength of connectivity globally
>atomoxetine reduced the number of strongly correlated...
>>
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tits in return
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>>8222074
Of course. Why do you think they give them to people, to "heal" them? Not at all. That doesn't make money.

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Rest in peace, hyperloop.

Other than discussing that video, I am interested in how this guy is a chemist but debunks a bunch of projects that are mostly engineering and physics.

Were we all tricked? Is chemistry actually the true science with the most useful knowledge?
>>
I hate that comic, he tries so hard to make the characters diverse, it's unrealistic
>>
>>8224590
>comic
>realism
>>
>>8224590
It is just a comic though. As long as all he is doing is using the paint fill tool with the color brown and not doing any kind of political pushing of diversity then it is fine.

Literally who cares.

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