Leave these fields empty (spam trap):
Name
You can leave this blank to post anonymously, or you can create a Tripcode by using the format Name#Password
Subject
Comment
[i]Italic Text[/i]
[b]Bold Text[/b]
[spoiler]Spoiler Text[/spoiler]
>Highlight/Quote Text
[pre]Preformatted & Monospace Text[/pre]
[super]Superset Text[/super]
[sub]Subset Text[/sub]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists
File

Sandwich


Discord Now Fully Linked With 420chan IRC

Shepard tone

View Thread Reply
- Fri, 27 Dec 2019 16:55:46 EST 3jLosd5D No.79720
File: 1577483746780.png -(1730651B / 1.65MB, 1920x1080) Thumbnail displayed, click image for full size. Shepard tone
how does endless sound illusion affect the brain? https://www.youtube.com/watch?v=D0ZKqHF_vug from the point of view of science?
1 posts and 1 images omitted. Click View Thread to read.
>>
Miner49er !8davHXfHRc - Sat, 11 Jan 2020 18:14:09 EST yc29z27Z No.79744 Reply
1578784449367.jpg -(7743B / 7.56KB, 250x250) Thumbnail displayed, click image for full size.
@79720
"What is Panda Express for 1,000,000 Mr. Wick?"
User is currently banned from all boards
>>
Angus Blatherway - Mon, 20 Jan 2020 23:36:42 EST dn0CF5zg No.79747 Reply
>>79720
that would just become some kind of background noise to an adaptable brain probably. You can probably hide in it maybe. What do you think it would atrophy someones auditory awareness?


Ordering of large finite numbers

View Thread Reply
- Fri, 10 Jan 2020 12:02:42 EST zCQgmjjm No.79738
File: 1578675762414.jpg -(72414B / 70.72KB, 620x466) Thumbnail displayed, click image for full size. Ordering of large finite numbers
I'm looking for some sort of ordering or classification of finite numbers.
Not infinite numbers, I know about ordinals but I find them kind of boring by themselves.

So any of these numbers would be strictly smaller than the first infinite ordinal.
For instance

  1. Trivial numbers like 1, 42, 4354353843745897394759347592347 that can easily notated using a number base
  2. Numbers that can be represented by scientific notation like 2^256, 10^100, etc...
  3. Using power tower (up arrow notation) like 2↑↑↑↑3, grahams number (g64)
  4. Chained arrow notation like 2 → 3 → 4 → 5 → 6
  5. Numbers that can not be notated explicitly but can be referenced by their fast growing function representation like TREE(3)

is this possible ???
6. Something that has to come after that, like numbers that are too large to be referenced by a function representation but can be deduced by other means like a process of describing a function like using self modifying code...


Will be positing about these notations and functions once I understand them well enough.
1 posts omitted. Click View Thread to read.
>>
Nathaniel Sublinghare - Fri, 10 Jan 2020 22:11:03 EST zCQgmjjm No.79741 Reply
>>79739
I learned about this from Numerphile too, they also have a video about TREE(3) and even talk about things like TREE(g64)

I'm not quite sure what I am asking perhaps if numbers that are too large to be useful to be used. I guess every finite number that can be reasoned with must have a function representation (if you know where is the proof for that)

Perhaps the 6th category on my list would be numbers for which it's simplest function representation is too complex.
For instance take the closest prime number to TREE(3), or almost any other number with the same magnitude.

What's also interesting if there is any way to compare numbers in the latter categories. For instance can we come up with some numbers that serve as a lower and upper limit for TREE(3)?
>>
Nathaniel Sublinghare - Fri, 10 Jan 2020 22:30:23 EST zCQgmjjm No.79742 Reply
Sort of answering my own questions here except that the links here go a bit over my head.
https://googology.wikia.org/wiki/Subcubic_graph_number
> Adam P. Goucher has shown that SSCG(2) << TREE(3) << SSCG(3).

and
https://googology.wikia.org/wiki/Transcendental_integer
>If n is an integer then we call it transcendental iff the following holds: let M be a Turing machine, such that there is proof in ZFC of length at most 2^1000
showing that M halts.
This seems a little arbitrary though.
>>
trypto - Fri, 10 Jan 2020 22:59:10 EST dEGML8x1 No.79743 Reply
>>79741
>numbers that are too large to be useful to be used
Used how? I think even a number like 10^5000 is nonsense in any physics application. Whether you're talking about time or number of particles, exponents get to nonsense pretty quickly (I think 10^50 is also mostly useless, I just bumped it up a couple orders of magnitude to be sure).

>Perhaps the 6th category on my list would be numbers for which it's simplest function representation is too complex.
>For instance take the closest prime number to TREE(3), or almost any other number with the same magnitude.
Oh, OK. That's cool. "Too complex" has some implications, though. With infinite amount of space and brain, I'm sure you could prove that no finite number is too complex. But for normal people and a brain, maybe there's a limit?

I knida doubt there's a good answer. It's like a more complex version of 'what's the biggest number you can name" and then you take that number and add one. But in this case, it's a function that you're gradually improving.

> Adam P. Goucher has shown that SSCG(2) << TREE(3) << SSCG(3).
woah

>If n is an integer then we call it transcendental iff the following holds: let M be a Turing machine, such that there is proof in ZFC of length at most 2^1000

Looked at the link. don't understand this 1 fucking bit lol. Keep at it, amigo

Brain and illusions

View Thread Reply
- Fri, 10 Jan 2020 11:23:33 EST ZwEVdfrb No.79737
File: 1578673413450.jpg -(30765B / 30.04KB, 580x290) Thumbnail displayed, click image for full size. Brain and illusions
When we watch illusions https://www.youtube.com/watch?v=RgNcjak0bQU&feature=emb_logo https://www.youtube.com/watch?v=G6CiuRQHv3w&list=LL8Hl4wSKvUUL8qKlFE4P0Zg&index=2&t=35s , does your brain rearrange and adapt to the illusion, or is it the fault of our brain and its limitations ?
>>
trypto - Fri, 10 Jan 2020 19:11:47 EST dEGML8x1 No.79740 Reply
>>79737
>does your brain rearrange and adapt to the illusion, or is it the fault of our brain and its limitations ?
These are the same thing, IMO.

Your brain makes various "guesses" and constantly fills in blanks about what it doesn't know. It creates 3D images from two 2D images. Sometimes, those shortcuts result in illusions. It's adpating to limitations.

mdma recipe

View Thread Reply
- Tue, 07 Jan 2020 20:46:28 EST qe9U4Xna No.79732
File: 1578447988790.jpg -(200457B / 195.76KB, 1134x799) Thumbnail displayed, click image for full size. mdma recipe
Hello, does anyone have an MDMA or speed recipe to share?

I do not intend to sell. I'm addicted and tired of being robbed by traffickers.

I want the independence of making my own drug.
>>
Betsy Tillingham - Wed, 08 Jan 2020 14:27:31 EST mLXRJL/e No.79735 Reply
1578511651116.jpg -(381754B / 372.81KB, 718x1278) Thumbnail displayed, click image for full size.
3/3 very valuable recipe MDMA is much harder though and precursor is more expensive for what you get.

life expansion pearls to swine fuck christ

View Thread Reply
- Mon, 07 Oct 2019 18:45:00 EST MqS9VQoB No.79620
File: 1570488300148.jpg -(10608B / 10.36KB, 480x360) Thumbnail displayed, click image for full size. life expansion pearls to swine fuck christ
how do i realistically preserve my brain past the death of my body? must i keep blood supplied to it , harvesting more and more fresh blood, or may i simply have new organs connected to my system every few decades? obviously i will need to be fed and cared for which presents its own problems. i will most likely lose motility, unless i am some how gifted advanced robotics, even then it is unlikely i will ever again come close to the perfection of the human form. it is more likely that I will gain additional appendages such as arms and eyes that should be able to take in information, and output. access to the worlds' life center : the internet. research into xeno-transplantation and overcoming graft vs, host disease is highly suggested for study . s t i r k
5 posts omitted. Click View Thread to read.
>>
George Giggleridge - Tue, 08 Oct 2019 18:48:49 EST gpiglBfJ No.79627 Reply
>>79620
well 420c i will be creating my dzoujins in the meanwhile, which will feature life expansion and lolis. wish i could get some funding for this shit . more importantly, for the research. s t i r k we can't forget that the females should be saved as well . how can i even begin to understand their physiology sigh

Real working lightsaber

View Thread Reply
- Mon, 26 Aug 2019 16:47:38 EST 8UA92SFd No.79565
File: 1566852458568.gif -(32215B / 31.46KB, 600x531) Thumbnail displayed, click image for full size. Real working lightsaber
I have come up with a method. I just lack the technical know how.
You would need basic laser technology, but modified so that the laser gas is generated from the surrounding air with an oxygen concentrator. If you could manage to push enough energy through it, you could have a cutting laser. Now, there are ways to magnify the laser into more of a blade, but the issue is a laser just goes on and on, it doesnt stop. So you would need a way to stop it. I suggest a telescoping heat resistant pole that extends when activated, at the end of which is a circular beam trap. Instead of one laser, this design would call for a circle of beams around the inner pole which would make a wider blade. The inner pole could also likely be used to block. The lasers would only be for heat.

Cons:
Cant be used for stabbing
is like a first gen prototype and not so combat worthy
im not sure a metal strong enough exists
im not sure enough power could be made portable unless a mini generator was invented

Pros:
would absolutely cut and burn,
would definitely resemble a lightsaber.
is absolutely possible

add ideas or use this stuff guys, lets become jedi
3 posts omitted. Click View Thread to read.
>>
Shitting Guddleworth - Thu, 02 Jan 2020 21:57:31 EST ji5ChKfq No.79730 Reply
>>79566
Maybe you dont need lasers,

Maybe the mercury, magnets and resonators would do good. It will also be lighted up.

Drugs from Yeast

View Thread Reply
- Tue, 19 Nov 2019 14:28:29 EST +/RBoDwy No.79685
File: 1574191709885.jpg -(469912B / 458.90KB, 976x1280) Thumbnail displayed, click image for full size. Drugs from Yeast
>We combined enzyme discovery, enzyme engineering, and pathway and strain optimization to realize full opiate biosynthesis in yeast. The resulting opioid biosynthesis strains required expression of 21 (thebaine) and 23 (hydrocodone) enzyme activities from plants, mammals, bacteria, and yeast itself. This is a proof-of-principle, and major hurdles remain before optimization and scale up could be achieved.

The opioid crisis is about to get a lot worse and the potential here is limitless. Psilocybin, THC, cocaine, you fucking name it can all be made with this technology. Genetically modified yeast are going to be the Nagasaki and Hiroshima of the war on drugs.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4924617/
7 posts omitted. Click View Thread to read.
>>
Beatrice Huddlefoot - Thu, 05 Dec 2019 15:29:38 EST zCQgmjjm No.79705 Reply
>>79703
Well then what's to stop anybody from building a large scale bio-centrifuge out of a washing machine or something like that?

Also as I understand it the impressive thing about crispr tech is that this isn't limited to one specific organism.
So I'm looking forward to THC blueberries
>>
Shitting Guddleworth - Thu, 02 Jan 2020 21:52:44 EST ji5ChKfq No.79729 Reply
>>79703
If you progresivelly filter it out of water, you may end up with something, then you can find them better producing maxima... Maybe the solubility for opiate means you can mix it with filter and then have a division where solution doesnt end up back in the huge mix.

Imagine, 1 cubic metre is one TON of it. Thats quite big and it fits in a garage.

Asking a question

View Thread Reply
- Tue, 17 Sep 2019 18:16:03 EST dG+H9zcd No.79583
File: 1568758563262.jpg -(134888B / 131.73KB, 1784x742) Thumbnail displayed, click image for full size. Asking a question
I've been struggling with this problem I need help
8 posts and 2 images omitted. Click View Thread to read.
>>
Henry Faggleworth - Wed, 20 Nov 2019 22:26:39 EST JEjs93kf No.79688 Reply
This question seems to assume there is a straight line between Elizabeths house and the bus stop, on which line she can only travel. Pretty dumb.
>>
Hugh Fommerford - Tue, 17 Dec 2019 22:48:19 EST lppUtLoU No.79711 Reply
>>79583
the variable x assumes x values noted in yards and is limited from 0 to 240
>>
Hedda Bardshit - Thu, 02 Jan 2020 21:48:30 EST vMKzSDRg No.79728 Reply
>>79583
It is a real number, therefore it assumes infinite positions.

fear of the electromagnetic spectrum

View Thread Reply
- Sun, 24 Nov 2019 07:41:22 EST W+fNKKVr No.79692
File: 1574599282211.jpg -(97371B / 95.09KB, 500x1141) Thumbnail displayed, click image for full size. fear of the electromagnetic spectrum
So with this 5G coming up we're hitting a new wave of protests, meetings etc etc about the alleged dangers of all kinds of microwaves, and I noticed a lot of people around me are absolutely convinced wifi, cellphones and even microwave ovens are horrible for their health.

I'm not well versed on the subject of the effects of certain wave lengths, but aren't all wavelengths we use in the modern world non-ionizing and incapable of causing cancers? Are there any real reasons to be afraid or is it just people being afraid of things they do not understand?
6 posts omitted. Click View Thread to read.
>>
Fanny Brebberford - Fri, 29 Nov 2019 09:19:58 EST zOamIS55 No.79701 Reply
>>79698
Well, electric fields act on charged particles. So, if there's say, a K+ ion in a solution, an electric field of sufficient strength would be able to control its movement.

Since radiation is an alternating electric field, they cause oscillations of charged particles. It is this mechanism that makes me warry, more than the actual transfer of energy from the wave to the body
>>
trypto - Sat, 30 Nov 2019 12:08:29 EST DNUfrhte No.79702 Reply
>>79701
>It is this mechanism that makes me warry, more than the actual transfer of energy from the wave to the body
But what you're describing is a transfer of energy from the wave to the body.
> they cause oscillations of charged particles.
This is a transfer of energy.. However, the powers we're looking at are insignificant. Millimeter wavelength (5G) barely penetrates the skin. Compared to the radiation you experience from the sun, it's not something you should really worry about.
>>
Hedda Bardshit - Thu, 02 Jan 2020 21:27:13 EST vMKzSDRg No.79727 Reply
What about it renders water crazy, as its really a lot energy.

Earth 2.0

View Thread Reply
- Mon, 24 Jun 2019 21:15:40 EST 6GuGraLS No.79474
File: 1561425340761.jpg -(226587B / 221.28KB, 1300x731) Thumbnail displayed, click image for full size. Earth 2.0
Let's discuss how we could update and redesign our global infrastructure and cities, as well as building new ones, in order to better utilize the latent global energy available. Thermal/kinetic/wind/water/solar energy into electricity, and built into our infrastructure and cities. Can we utilize biotechnology? Nanotechnology?

>What would be the hardest parts of this process? It is too costly to redesign the old? Should we just build elsewhere? Maybe even in space or other worlds?

>What should these new infrastructure/city designs be like? Are there certain geometries or naturalistic patterns we can mimic to make our structures more efficient at weight bearing, flexibility, etc? Something out of Stark Trek or the Venus Project? The word "ecopotia" comes to mind here.

>Can it be done before we succumb to environmental collapse in the next 10-100 years?

>What will have to be changed socially, culturally, economically for these changes to make a meaningful lasting impact on our world for the better?

Try not to be assholes in this thread, let's get some good ideas going, show us /stem/'s got what it takes. SLAYER
5 posts omitted. Click View Thread to read.
>>
Hedda Fablingshit - Tue, 09 Jul 2019 14:38:28 EST ISfiqZPW No.79485 Reply
>>79482
>>79483

the obstacle here is that our society is governed by corporations and states not by human interests
>>
Angus Blackfuck - Thu, 05 Dec 2019 17:50:10 EST 6GuGraLS No.79706 Reply
>>79485
One could argue that corporations are an expression of human interests, but I think by using a profit-driven model, fueled by the ideology of capitalism, which wrs upon the supposition of infinite growth, corporations actually tend to work against LONG TERM human interests, only really giving temporary relief to human life through short term pleasures.
>>
Hedda Bardshit - Thu, 02 Jan 2020 21:26:04 EST vMKzSDRg No.79726 Reply
>>79474
Plan for far fetched futurue, yes, there are patterns, patterns that help people think, patterns that make city effective.

Geometrical structures, that are more optimized than grid.

We are already having troubles with enviroment, and when ice is gone, it can release some gas from the ice to atmosphere, no more melting ice as it gets warmer, change will be faster when Ice melts...

We already are out of time.

Think eco friendly for the masses. Maybe sustainability had to be number one issue since beggining of human race, but its hard to tell money about that.

Mineral Toughness

View Thread Reply
- Sat, 28 Dec 2019 16:12:37 EST fC6fDMjQ No.79722
File: 1577567557755.jpg -(17971B / 17.55KB, 320x320) Thumbnail displayed, click image for full size. Mineral Toughness
So we're all familiar with the Moh's scale of mineral hardness, which is based on which minerals can scratch which. But I'm curious about the topic of mineral "toughness", which is based around how easily a given mineral will crack, chip, shatter, etc.

Apparently this is much harder to measure, however, and I can't find much info on this topic online. can anyone help me find a list of minerals / gemstones ranked by toughness, or something similar?

(pic related, jade is generally agreed to be the toughest mineral, supposedly)
>>
UnamusementPark !ikwaNLFmBo - Sat, 28 Dec 2019 21:23:40 EST axTZCwuz No.79723 Reply
1577586220677.jpg -(264404B / 258.21KB, 850x1200) Thumbnail displayed, click image for full size.
79722<<
>>126631754
Too bad, your career was built by me. You're off model.
User is currently banned from all boards
>>
Edwin Dongerdock - Wed, 01 Jan 2020 07:42:59 EST 5Fcvu2ce No.79724 Reply
>>79722
This is what I found from a quick google search. There's a few charts, one of which covers the hardness of various minerals and gemstones. There is mention of different scales and methods of measuring aside from Moh's scale, as well. You probably want the Knoop or Vickers scale.

Improving the world

View Thread Reply
- Sat, 19 Oct 2019 17:32:21 EST DOM06p0S No.79635
File: 1571520741179.jpg -(250078B / 244.22KB, 1280x789) Thumbnail displayed, click image for full size. Improving the world
Wadido! - this is friggin crazy but ive been thinkin bout our infrastructures, both digi/phys+abstract(lk methodology/philosophy etc), n w/ Web 3.0 loomin n Hyperloop bn 2 xpensiv n stf, n lk Paravelo's kickstarter failin (so we dont have version 2/3/4 etc representin d world most glorious omnivehicle (esp w/ "shuttlebike", n "bufalino camper"-inspiration etc; man!)
haha man im gna try 2 not b 2 long n u prob dont even wanna read my weird writin (yet strangely efficient, eh? ;) but ima gv this a shot; that said its v hard 2 talk openly n still even remotely briefly bout my ideas w/o soundin lk a very uninformed megalomanic hyperbolic delusional probably lying narcissist; cuz frankly; thers thousands of em; n errytin points 2 dozens of em bn prob extremely revolutionary; lk im talkin potential 4 major disruption ATLEAST of d tech-giants; esp if widely adopted, n i c no reason why most of em wudnt; its like userfriendly walled garden breaking multimedia-linux, d bicycle n industrial hemp + improved infrastructure - im talkin global bicyclepaths, canals n microtrains galore; except in d yr 3000... (n im not even mentioning d measures that can b taken 2 mk elevator-driven skycraper-gliding/ziplining s transportation work, nor "physical internet"-dynamix etcetcetc) - im sittin on an invention-treasure trove probably unheard of throughout history... n its awkward s fuck cuz lk did u jz read that? lk i literally cant talk bout it w/o soundin mad; n i cant rly feasibly bootstrap these things; i dont wanna chug along w/ 1/a few of em at a tm; n even less go 2 ppl who'd poach me; yet i want 2 get these things manif asap; i fl im dn humanity a disservice o/w; i've written/sorted mr than half a million words bout this n downloaded/sorted/categorized 40k pix, mostly f/ pintrest, n taken another 40k ss's + ive saved, sorted, n mostly read thru over 100k bm's... these im all in d process of sortin/integ'n in2 a website lk a priv kickstarter (+2 avoid copyright probs w/ d pix (+snitches~proxy-poachers; by pub'n only 2 trusted ppl) - a MoaP lk Engelbarts MoaD except instead jz d prez; d demos all bn video-based n d proofs of concept bn slightly mr detached f/ correspondin products, albeit not 2 much; its jz combining various things that unlikely, yet possibly; might cause unforseen probs etc) but this whole prez is still not gna b dn 4 atleast a few weeks (bn workin on it 4 over 6yrs..)(still omitting 300k+ words that focus on less urgent/mr underpinnin things like philosophy/politics/my autobiography etc etc; any1 wanna don8 2 me in hope that im tellin d truth/isnt crazy ❤️? 2 help me avoid havin 2 do chores lk gettin welfare/a job etc? shud i post wallet? or do u hv policy against it like the future? n do i rly hv 2 format/translate this 4 ppl 2 bother readin it? leet-speak-textese not catchin on..?

Cheers people - here's 2 unconventional pitches n unconventional places 2 pitch em! <3
4 posts and 3 images omitted. Click View Thread to read.
>>
Nicholas Sizzlefedging - Mon, 21 Oct 2019 02:07:06 EST LtoQVBrS No.79644 Reply
1571638026510.jpg -(119102B / 116.31KB, 500x449) Thumbnail displayed, click image for full size.
>>79635
I don't think you are as smart as you claim to be, since you would probably understand that most people won't blindly donate to a person who has only made rather grand claims and shown no proof for those claims.

I liked your writing style but I also think you have to understand it's not going to help you get money from people. it reminded me of Feersum Endjinn by Ian M. Banks.

I would love to read some of this compiled information of yours.

I think you might not understand that our modern society does not care about grand ideas for the sake of grand ideas. It's all about your ability to sell those ideas. Doesn't matter if it saves an endangered species, feeds thousands of familys, or ends corporate dictatorship, your wonderful ideas are worth nothing unless you can convince the powerful that they will benefit from it's implementation. And everything points to the powerful being egotistical and selfish, choosing consolidation of their wealth over the growth of others. It doesn't matter why they choose that, it is just the way it is.

You cannot just have great ideas and change the world, not any longer.

Not to mention, if your ideas were as great as you claim, you would immediately release them for the betterment of humanity and not try to extort a couple bucks from a bunch of stoners. If they are as great as you say, spam Musk until he saves us All.
>>
Bombastus !uYErosQbLM!!Mybq1UbK - Tue, 24 Dec 2019 03:59:30 EST 5ow1Kw7k No.79718 Reply
>>79635
my god i miss a wizard

but not really
but also kinda i do yeah
>>
trypto - Wed, 25 Dec 2019 22:18:33 EST dr4FIF7b No.79719 Reply
>>79718
I feel like there's been a general decline in schizoposting lately

BUMP WHEN LEARNING

View Thread Reply
- Sat, 21 Apr 2018 22:40:48 EST +0GOZxpM No.79082
File: 1524364848505.jpg -(34547B / 33.74KB, 497x385) Thumbnail displayed, click image for full size. BUMP WHEN LEARNING
BWL

This thread is for neat facts. not fun facts .
Post here when you learn something interesting, and then I'll read it and think "Wow! Neato!"
13 posts and 4 images omitted. Click View Thread to read.
>>
Graham Blatherbanks - Wed, 23 Oct 2019 14:20:16 EST Rb+VNs2J No.79647 Reply
1571854816099.jpg -(125943B / 122.99KB, 800x600) Thumbnail displayed, click image for full size.
Did you know there are bacteria (and archaea) that live inside rocks? Like if you cut a massive boulder in half, there's stuff living in there. Or if you dig the deepest hole anyone has ever dug, there's stuff living down there.

These weirdo organisms, that are probably uber common relative to surface life, spend a majority of their energy just living, which is in pretty striking contrast to most life we know that spends its energy growing and reproducing.

It's nice to know that even if we start a nuclear winter or catch the atmosphere on fire or whatever, plenty of life will survive and keep evolving.

https://www.sciencedaily.com/releases/2018/12/181210101909.htm
>>
Frederick Noblingchane - Thu, 12 Dec 2019 15:22:15 EST Rb+VNs2J No.79710 Reply
1576182135016.jpg -(173922B / 169.85KB, 500x388) Thumbnail displayed, click image for full size.
What I learned on wikipedia today:
In one hour a dog can produce as much prostatic fluid as a man can in a day.

Report Post
Reason
Note
Please be descriptive with report notes,
this helps staff resolve issues quicker.