Search found 5516 matches

by Xanthir
Sat Sep 09, 2017 9:07 pm UTC
Forum: Science
Topic: Why is there red on both sides of digital rainbow images?
Replies: 25
Views: 3837

Re: Why is there red on both sides of digital rainbow images?

@Flumble: Ugh, yeah, I noticed that, but the image doesn't appear to be on Wikipedia at all anymore. And the current response-curve image I could find doesn't have the little uptick in red response out past blue, which is key to the whole damn thing. Ughhhhhhhh. Why does the digital image of the rai...
by Xanthir
Wed Aug 30, 2017 5:36 pm UTC
Forum: The Help Desk
Topic: Windows 10 Automatic Update
Replies: 11
Views: 4810

Re: Windows 10 Automatic Update

Please don't stop your Win10 updates. Those are important to prevent your device from getting pwned. Days sometimes matter when a new exploit comes out that's easy to weaponize into a worm. Yes, it's annoying when your PC restarts, and sometimes updates come with other stuff that you don't care abou...
by Xanthir
Wed Aug 23, 2017 7:39 pm UTC
Forum: Science
Topic: American solar eclipse
Replies: 44
Views: 5124

Re: American solar eclipse

Yeah, there's a reason several of my friends who traveled to see totality turned it into a multi-day vacation - it led them avoid the post-eclipse traffic!
by Xanthir
Mon Aug 21, 2017 10:42 pm UTC
Forum: Fictional Science
Topic: Universe with different laws of physics
Replies: 6
Views: 3094

Re: Universe with different laws of physics

A really nice one is the Orthogonal series by Egan - a trilogy of sci-fi novels exploring a universe with Euclidean spacetime (rather than Minkowskian, as ours is). They're interesting in their own right, with recapitulations of modern social struggles in a pretty alien species, but they're also a b...
by Xanthir
Mon Aug 21, 2017 9:30 pm UTC
Forum: Science
Topic: American solar eclipse
Replies: 44
Views: 5124

Re: American solar eclipse

My wife accidentally took a great shot - the sun itself is flared out, but the lens flare got a really sharp rendition of the eclipse: https://twitter.com/tabatkins/status/899685444081770496
by Xanthir
Mon Aug 21, 2017 9:27 pm UTC
Forum: Science
Topic: best way to store matter on a large scale
Replies: 13
Views: 1800

Re: best way to store matter on a large scale

↶ Stars are what you get when you store hydrogen. In the same sense that a runaway reaction is what you get when you store enriched uranium: only if you're fucking it up . If you store hydrogen in sufficiently small clumps, you don't get uncontrolled ignition. That's probably all you need to do - s...
by Xanthir
Mon Aug 14, 2017 7:33 pm UTC
Forum: Fictional Science
Topic: Alien Species with 2 Independent Pairs of Sexes
Replies: 3
Views: 1900

Re: Alien Species with 2 Independent Pairs of Sexes

Mating schemes distilled into an easier list: MM+MF = B-mate for MM MM+FM = A-mate for MM MM+FF = A-mate for MF, B-mate for FM MF+FM = A-mate for FM, B-mate for MF MF+FF = A-mate for FF FM+FF = B-mate for FF As you note, the mix sexes are viable on their own, and have the interesting social dynamic ...
by Xanthir
Wed Aug 09, 2017 9:58 pm UTC
Forum: Mathematics
Topic: Foolish question debunked. Move on, nothing to see.
Replies: 80
Views: 9845

Re: Does the Banach–Tarski Paradox prove that you can't see the edge of the universe?

B-T has nothing to do with viewpoints, or translations of viewpoints. It's just a funny example of a non-intuitive result of the Axiom of Choice.
by Xanthir
Wed Aug 09, 2017 4:50 pm UTC
Forum: Mathematics
Topic: Foolish question debunked. Move on, nothing to see.
Replies: 80
Views: 9845

Re: Does the Banach–Tarski Paradox prove that you can't see the edge of the universe?

Yeah, either there's an edge, or it's closed (wraparound), or it's infinite. As people repeatedly say, none of those involve B-T.
by Xanthir
Tue Aug 08, 2017 11:22 pm UTC
Forum: Coding
Topic: var == 'value' vs 'value' == var
Replies: 20
Views: 7406

Re: var == 'value' vs 'value' == var

Hmm, yeah, "tainting" the result of an assignment such that it can't be used directly as a boolean would work even better. The tautology operator (!!) is always there for you.
by Xanthir
Tue Aug 08, 2017 10:24 pm UTC
Forum: Coding
Topic: var == 'value' vs 'value' == var
Replies: 20
Views: 7406

Re: var == 'value' vs 'value' == var

Yeah, that's a reasonable retort. Anyone who does "foo() == true" is making a mistake in the first place. ^_^ So, make the following fixes: 1. if() (and loops) *only* accepts actual bools. 2. == and != does *not* accept bools (instead it throws an error saying to just use the value itself,...
by Xanthir
Mon Aug 07, 2017 8:13 pm UTC
Forum: Coding
Topic: var == 'value' vs 'value' == var
Replies: 20
Views: 7406

Re: var == 'value' vs 'value' == var

No, you get the problem even if you throw away the concept of "truthy/falsey", if the accidental assignment was of a boolean value.
by Xanthir
Tue Aug 01, 2017 9:54 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 608
Views: 72560

Re: Science-based what-if questions

The singularity is absolute minimum entropy; there's a single possible arrangement of things in a singularity. (Rather, our models fail at singularity, but at an ε afterwards, entropy is still exceedingly small and rapidly increasing.) Heat death is maximal entropy; the *density* of entropy asymptot...
by Xanthir
Mon Jul 24, 2017 10:31 pm UTC
Forum: Gaming
Topic: My Pokemanz, let me show you them...
Replies: 543
Views: 118441

Re: My Pokemanz, let me show you them...

The legendary raids started yesterday in Pokemon Go (Lugia and Articuno only, right now), and Googlers have been organizing raid parties all day today. Gotten pretty lucky with my catches - caught a Lugia immediately, then did 3 raids before catching my Articuno (and then caught another on the fourt...
by Xanthir
Thu Jul 20, 2017 5:07 am UTC
Forum: Mathematics
Topic: Determining line of sight over time
Replies: 30
Views: 5393

Re: Determining line of sight over time

You can trace the path of each object individually, seeing when, if at all, it intersects the line going between the two target points. Do this for every object, and you'll have a list of precisely when the line-of-sight is blocked, and thus can easily tell if there are any clear periods where nothi...
by Xanthir
Thu Jul 20, 2017 2:48 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

The specific dialect I was using at the time (Corman Common Lisp) didn't require the # in some circumstances - you could just pass the quoted symbol. It was kinda confusing.
by Xanthir
Wed Jul 19, 2017 1:19 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

First print it out, take a picture with your digital camera against a wooden table, *then* import into a Word doc, screenshot it, and attach it to an email.
by Xanthir
Tue Jul 18, 2017 3:04 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

That's part of it, yeah. It's difficult to create a *less* efficient form of video than GIF.
by Xanthir
Mon Jul 17, 2017 3:31 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

I feel like it might have been suggested in the past, but I don't recall anything specific coming of it. Feel free to open an issue about it in csswg-drafts, with the usage examples you're citing (which are why Twitter doesn't actually do gifs; it transcodes them to videos so it can pause them >_<).
by Xanthir
Wed Jul 12, 2017 6:26 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Yeah, push notifications are opt-in, and repeated-sync will probably be opt-in as well. It depends on how our security and UX people figure it; for example, we might figure that someone who visits a news site every morning is okay to silently opt-in to auto-sync in the morning. This is similar to th...
by Xanthir
Tue Jul 11, 2017 9:24 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Good thing 24 hours isn't nearly enough time for a malicious actor to do any real damage. I'll make myself more explicit here: If your server is hijacked by a malicious actor, they can send a malicious page to your users with *enormous* cache times, effectively sticking your user to the malicious p...
by Xanthir
Tue Jul 11, 2017 9:20 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

↶ Is the idea that the following scenarios would prevent this from being a threat? ⋅ User visits malicious site; site installs a SW ⋅ While the user remains online, the site can continue to request sync notifications but they will continue to succeed immediately, same as the pag...
by Xanthir
Tue Jul 11, 2017 8:29 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Yeah, the "unsecured wifi = pwn every page you look at by mitm'ing a SW" was, like, the very first attack we thought of when writing the spec. It's why SWs are HTTPS-only. (And why *most* new powerful features are HTTPS-only, for that matter.) The "https, but the server was pwned, so ...
by Xanthir
Tue Jul 11, 2017 8:26 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Is that true? Can the service workers make external connections (even back to the same origin) on their own accord? What permissions, if any, are needed to be granted by the user for this to be the case? Not "of their own accord". While the page is open, it can request that the SW be sent...
by Xanthir
Tue Jul 11, 2017 7:48 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Sorry, but you'll just have to excuse me if I'm not enthusiastic about the prospect of J. Random Web Developer getting to run code on my computer from a page I'm not even currently on. If the developers did consider the potential for attack exploits and still concluded this was a good idea, then, w...
by Xanthir
Tue Jul 11, 2017 6:17 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9848
Views: 1721559

Re: Coding: Fleeting Thoughts

Service Workers are actually extremely good shit . Here's the thing: they don't just run whenever. They're not like page code, capable of doing anything it wants at arbitrary times. It's completely event-driven, and those events are things the browser controls. (Things like "the page wants this...
by Xanthir
Thu Jun 29, 2017 10:35 pm UTC
Forum: Science
Topic: Hydrodynamic Levitation
Replies: 35
Views: 4850

Re: Hydrodynamic Levitation

They're also all using styrofoam, which water adheres to pretty readily. I've done enough screwing around with water and plastic balls in my youth that I don't think it works nearly as well for standard smooth toy plastic; the water wouldn't be carried around the ball nearly as much and would mostly...
by Xanthir
Thu Jun 29, 2017 10:27 pm UTC
Forum: Science
Topic: Is terraforming Uranus and Neptune possible?
Replies: 22
Views: 5320

Re: Is terraforming Uranus and Neptune possible?

Yeah, from what I heard, the Sun will only have burned 5-10% of its hydrogen when it starts to die; it's just that most fusion occurs in the core, and the heavier helium sinks down there and stinks up the place. If you could just stir the sun up a little bit, you could give it tens of billions of ye...
by Xanthir
Sun Jun 25, 2017 5:44 pm UTC
Forum: Mathematics
Topic: Why do kids in school dread math?
Replies: 40
Views: 8369

Re: Why do kids in school dread math?

It's a place you go with a bunch of other kids to learn things, and is often *part of* an existing elementary school. Don't be that "obviously prepositions can't go at the end of sentences!" person.
by Xanthir
Tue Jun 20, 2017 3:43 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 608
Views: 72560

Re: Science-based what-if questions

Yes, again, that's called a laser.
by Xanthir
Tue Jun 06, 2017 8:48 pm UTC
Forum: Gaming
Topic: I need a Game Recommendation
Replies: 1514
Views: 329390

Re: I need a Game Recommendation

HES wrote:
Flicking through my game library, The Witness, The Talos Principle, and Q.U.B.E all tick the puzzles box

Those were the three I was going to suggest (and they're all good, in my experience). Also: The Swapper
by Xanthir
Fri Jun 02, 2017 7:42 pm UTC
Forum: Mathematics
Topic: Why do kids in school dread math?
Replies: 40
Views: 8369

Re: Why do kids in school dread math?

Math is a foreign language; you literally first learn math by co-opting the language centers of your brain. (Later, as you become more comfortable with it, you start drawing from other parts of your mind like your pattern-recognizer, which makes it flow faster and more intuitively.) Foreign language...
by Xanthir
Tue May 30, 2017 6:18 pm UTC
Forum: Science
Topic: Polaritons, Exitons, and Phonons
Replies: 1
Views: 1563

Re: Polaritons, Exitons, and Phonons

Phonons are the easiest to understand - in some circumstances, you can get localized sound waves that *act* similar to a particle (thus the name quasi-particle) - they'll collide with things, bounce off of each other, etc. Polaritons are just that concept, but with a photon involved - it's a wave in...
by Xanthir
Tue May 30, 2017 6:15 pm UTC
Forum: Mathematics
Topic: What would happen if $-1 bills were minted?
Replies: 20
Views: 5013

Re: What would happen if $-1 bills were minted?

Yeah, that's just being able to generate a loan against your future earnings, approved by yourself. We already have this mechanism in the real world, we just require a third party with positive funds as the go-between, and they charge interest for the favor/risk.
by Xanthir
Wed May 24, 2017 11:40 pm UTC
Forum: Gaming
Topic: Gaming fleeting thoughts
Replies: 653
Views: 95272

Re: Gaming fleeting thoughts

The Swapper does indeed have some really fucking hard puzzles in it, so don't feel bad. About halfway thru I just pulled out a walkthru and had fun with it.
by Xanthir
Mon May 22, 2017 3:00 am UTC
Forum: Science
Topic: Free Will
Replies: 161
Views: 18979

Re: Free Will

I mean, that was a legitimate position held by doctors for a while, and still factors into the ethics of anesthetics - is a "you're unconscious" anesthetic morally equivalent to a "you're paralyzed and will forget this" anesthetic? (The answer is "no" in both cases - th...
by Xanthir
Mon May 22, 2017 1:18 am UTC
Forum: Coding
Topic: var == 'value' vs 'value' == var
Replies: 20
Views: 7406

Re: var == 'value' vs 'value' == var

↶ The second variant I use sometimes with "<" in lisp, as the prefix notation throws me off in this case if I mix ">" and "<", e.g. (and (< 0 x) (< x 10)) A bit off-topic, but just so you know, < is an n-ary function in Lisp, so you can just write (< 0 x 10) for that k...
by Xanthir
Fri May 12, 2017 10:26 pm UTC
Forum: Computer Science
Topic: Rice's Theorem comprehension check
Replies: 2
Views: 2208

Re: Rice's Theorem comprehension check

I think so, yes. The proof sketch in Wikipedia makes it particularly clear to me - if you claim to have a program that can tell whether another program squares its numeric input, then I can feed it a program that does some arbitrary computation, throws the result away, then returns the square of its...

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