Search found 3289 matches

by Eebster the Great
Thu Apr 25, 2019 3:57 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2141: "UI vs UX"
Replies: 17
Views: 1296

Re: 2141: "UI vs UX"

I will note the arc of the final U is long but bends left.
by Eebster the Great
Sun Apr 21, 2019 1:18 am UTC
Forum: Science
Topic: Nitrogen to oxygen
Replies: 11
Views: 945

Re: Nitrogen to oxygen

What's the Schwarzschild radius of a mushroom? You are obviously missing the smaller picture. I think 20 g is a reasonable guess for a mushroom, which gives a Schwarzschild radius of 3 × 10 -29 m, compared to carbon's covalent radius of 8 × 10 -11 m. But if as per gmal you have lots of mushrooms ha...
by Eebster the Great
Sat Apr 20, 2019 10:24 pm UTC
Forum: Science
Topic: Nitrogen to oxygen
Replies: 11
Views: 945

Re: Nitrogen to oxygen

I second that it's probably C - transmuting to N, but I disagree that it's stuffed full of neutrons. Neutrons are not distinguished in the cartoon to such an extent as to be countable at all, and the "body" of the atoms needn't consist solely of nucleons any more than its eyes or mouth do,...
by Eebster the Great
Sat Apr 20, 2019 2:55 am UTC
Forum: Science
Topic: How do Maxwell's equations predict the speed of light?
Replies: 4
Views: 1000

Re: How do Maxwell's equations predict the speed of light?

I was coming from the perspective that the invariance of μ and ε had already been established and the invariance of c was thus what we wished to establish (which follows from c = (με) -½ , as you said). But if we wanted to go the other way around, taking the invariance of c as established, I can't s...
by Eebster the Great
Thu Apr 18, 2019 9:29 pm UTC
Forum: Mathematics
Topic: What do Average Mathmaticians Do?
Replies: 16
Views: 1635

Re: What do Average Mathmaticians Do?

I simplified the complicated and multifaceted process of how to secure funding for research because my question is not about that. My point is that because scientific research is inherently different from mathematical research, I do not understand how mathematicians who are not like geniuses like G...
by Eebster the Great
Thu Apr 18, 2019 1:05 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 248
Views: 43478

Re: Science fleeting thoughts

There is some room between keeping only one significant figure at each step and keeping 17.
by Eebster the Great
Wed Apr 17, 2019 11:21 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 248
Views: 43478

Re: Science fleeting thoughts

So it's not a crazy thought, but the difficulty is in how we can compare one time coordinate to another. I mean, if it makes sense for space to expand, it seems like it should make sense for time to expand too. Something analogous happens in special relativity, where each of two observers in relativ...
by Eebster the Great
Wed Apr 17, 2019 8:42 pm UTC
Forum: Science
Topic: Event Horizon Telescope image
Replies: 24
Views: 1303

Re: Event Horizon Telescope image

Yeah, it might be the same mistake made in the comic.
by Eebster the Great
Wed Apr 17, 2019 8:40 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 248
Views: 43478

Re: Science fleeting thoughts

I was pondering dark energy and accelerating expansion while half-asleep the other day. I had a Sudden Insight that we might have it wrong - the universe's expansion only looks like it's accelerating because actually time is slowing down! And then I remembered how well most of my Sudden Insights go...
by Eebster the Great
Wed Apr 17, 2019 6:05 pm UTC
Forum: Science
Topic: Event Horizon Telescope image
Replies: 24
Views: 1303

Re: Event Horizon Telescope image

The ratio of radii should equal the ratio of masses, which I find to be about 800-1800, depending on which estimates you use. So yeah, 200 is definitely low, though 2000 is a bit high. In any case, his measurement for the diameter of Sgr A* seems to be about 10 times too high. Using masses of 4.1 * ...
by Eebster the Great
Wed Apr 17, 2019 5:51 am UTC
Forum: Science
Topic: Event Horizon Telescope image
Replies: 24
Views: 1303

Re: Event Horizon Telescope image

Instead of "Powehi," can we please keep calling it Messier 87*?
by Eebster the Great
Fri Apr 12, 2019 9:08 pm UTC
Forum: Science
Topic: How do Maxwell's equations predict the speed of light?
Replies: 4
Views: 1000

Re: How do Maxwell's equations predict the speed of light?

Importantly, the permeability and permittivity of free space do not depend on your frame of reference, implying the invariance of the speed of light.
by Eebster the Great
Thu Apr 11, 2019 4:37 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2135: M87 Black Hole Size Comparison
Replies: 42
Views: 4088

Re: 2135: M87 Black Hole Size Comparison

cellocgw wrote:
Eebster the Great wrote:Singularities can get big in up to one dimension.


So they can be an infinite line?

No, but they can be circles of nonzero radius.
by Eebster the Great
Thu Apr 11, 2019 1:17 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2135: M87 Black Hole Size Comparison
Replies: 42
Views: 4088

Re: 2135: M87 Black Hole Size Comparison

Singularities can get big in up to one dimension.
by Eebster the Great
Thu Apr 11, 2019 11:02 am UTC
Forum: Language/Linguistics
Topic: Miscellaneous language questions
Replies: 590
Views: 112235

Re: Miscellaneous language questions

I don't think English has that exact expression (though it has brain surgery/rocket science), but we have the phrase "it's (all) Greek (to me)," as in, "I can't understand it." That seems to make the same kind of sense as "Chinese algebra" from a different geographic pe...
by Eebster the Great
Thu Apr 11, 2019 9:15 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2135: M87 Black Hole Size Comparison
Replies: 42
Views: 4088

Re: 2135: M87 Black Hole Size Comparison

In terms of what we can accomplish in the future that seems implausible to me now, I have to admit that when I was younger, I was convinced that the diffraction limit was somehow unbeatable. Obviously that is false by many orders of magnitude, as both this image and LIGO demonstrate (along with many...
by Eebster the Great
Wed Apr 10, 2019 11:46 pm UTC
Forum: Mathematics
Topic: Most useful isomorphisms you know?
Replies: 6
Views: 1236

Re: Most useful isomorphisms you know?

I like how random variables tend to be related to the same abstract probability space. Do you want to find a random point in the Mandelbrot set? Awesome! All you need is to apply the right deterministic function to a uniform random variable on the interval [0,1], and you got it! You can even do thi...
by Eebster the Great
Wed Apr 10, 2019 8:55 am UTC
Forum: Science
Topic: Relativistic Lorentz force
Replies: 38
Views: 8086

Re: Relativistic Lorentz force

I'm gonna hijack this necro to point out how advanced our physics education is that people feel embarrassed to ask about this insanely nuanced topic. I feel like this is a stupid question, but I'm blanking on the justification for why the Lorentz force makes sense in terms of special relativity. Ple...
by Eebster the Great
Wed Apr 10, 2019 5:43 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2132: "Percentage Styles"
Replies: 39
Views: 2994

Re: 2132: "Percentage Styles"

That is false. It is not "quasi-standard" for the US dollar, it is absolutely standard for the USD and for all other currencies using the $ symbol in their native formats. In American English at least, it is also standard to do the same with every currency symbol (except fractional denomi...
by Eebster the Great
Tue Apr 09, 2019 4:32 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2132: "Percentage Styles"
Replies: 39
Views: 2994

Re: 2132: "Percentage Styles"

Wait, do you mean "those who put the currency sign behind the price"? In front of the price is the place it's supposed to go: $14.99, $1200, etc. Incidentally, I find that the people who write %65 are also likely to write things like "15$" and (even worse) "1 million$"...
by Eebster the Great
Tue Apr 09, 2019 5:08 am UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 57
Views: 9665

Re: disproof of boltzman brain?

However, how unlikely is it really to get a big bang? Nobody really knows, but the implication of this thread is that somehow, it's more likely than random chance. I think every plausible explanation put forward for the Big Bang would satisfy that, since if it didn't, it would hardly qualify as an ...
by Eebster the Great
Sun Apr 07, 2019 9:00 am UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

Are they actually presented without argument, or have you just not checked what those arguments are?
by Eebster the Great
Sun Apr 07, 2019 8:16 am UTC
Forum: Mathematics
Topic: What do Average Mathmaticians Do?
Replies: 16
Views: 1635

Re: What do Average Mathmaticians Do?

I was very surprised when I learned that most math papers list authors in alphabetical order by surname. It's a very different mentality from medicine.

I feel like this somehow privileges authors with surnames starting with A and Z.
by Eebster the Great
Thu Apr 04, 2019 11:44 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

all they would demonstrate would be that the null hypothesis was (very probably) false. They wouldn't even do that, really. A low p-value just means that if the null hypothesis were true, this would be a very unlikely observation. If lottery balls are chosen randomly, then any particular number win...
by Eebster the Great
Thu Apr 04, 2019 6:06 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

It's worth pointing out that what a "p-value" means is just the probability of getting results at least that extreme if the null hypothesis is true. Very low p-values are would be unlikely if the null hypothesis were true, so they suggest it is false. If your p-value is below your α (basic...
by Eebster the Great
Wed Apr 03, 2019 12:57 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

OK, we aren't assuming anything. We are pointing out that you have so far based your entire hypothesis on the assertion that Croatian names of rivers are particularly likely to start kr, when they aren't. There is literally nothing to explain.
by Eebster the Great
Wed Apr 03, 2019 11:28 am UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

This would randomly happen less than 8 times in a million. I am not sure how you calculated that, a simple computer simulation tells me that a p-value is around 4/10'000. You won't get that low p-values for patterns in toponyms. > 1 - pbinom(15,50,1/13) [1] 5.822358e-07 That is in fact less than 0....
by Eebster the Great
Tue Apr 02, 2019 8:11 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2129: "1921 Fact Checker"
Replies: 49
Views: 4943

Re: 2129: "1921 Fact Checker"

I'm sort of imagining it the other way. The editor asked the writer to fact-check a bunch of stuff, and by the time he got to this stupid blurb, he was fed up and just decided it didn't matter.
by Eebster the Great
Tue Apr 02, 2019 4:02 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

Well, yes, in texts, a handful of words occur much more commonly than other words do (in Croatian, or any other language), and the sounds that occur in those words are more common in texts than the sounds that don't happen to occur in those words. What does that have to do with what we can expect t...
by Eebster the Great
Mon Apr 01, 2019 6:10 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2129: "1921 Fact Checker"
Replies: 49
Views: 4943

Re: 2129: "1921 Fact Checker"

Or maybe the writer did not even bother to think about what kind of cereal the term "corn" in the alleged historical document would have referred to and what possibly different kind of cereal their contemporary readers might understand when reading that word, given that they seemed to be ...
by Eebster the Great
Sun Mar 31, 2019 12:58 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2129: "1921 Fact Checker"
Replies: 49
Views: 4943

Re: 2129: "1921 Fact Checker"

Right, exactly. If today a newspaper reported that the price of corn in 1600 was ten pence a pound, people will assume they mean maize, even if in the 1600s, that's not what corn meant.
by Eebster the Great
Sat Mar 30, 2019 9:29 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2934
Views: 701007

Re: Miscellaneous Science Questions

Stack exchange has a great answer. Interleaving digits works in the following way: First you need to exclude terminating representations, so ½ = 0.4999..., not ½ = 0.5000.... Next, instead of interleaving individual digits, you interleave chunks of digits. For every number in R, you separate it int...
by Eebster the Great
Sat Mar 30, 2019 9:03 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

As I said, it's only extraordinary if we assume all letters should be equally common at the start of words and that words are formed completely at random, both of which are obviously not true. So your data sort of demonstrate that fact, but nothing more.
by Eebster the Great
Sat Mar 30, 2019 9:02 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2129: "1921 Fact Checker"
Replies: 49
Views: 4943

Re: 2129: "1921 Fact Checker"

"Corn" could well have referred to a variety of cereals to the people writing the alleged documents in the dusty archive, but it would not have meant that to readers of the Kansas City Sun in 1921. I suspect that what it might or might not have meant to people who wouldn't be born for sev...
by Eebster the Great
Fri Mar 29, 2019 11:22 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2934
Views: 701007

Re: Miscellaneous Science Questions

That's true, it suffices to prove there is a surjection, but it doesn't explicitly construct a bijection.
by Eebster the Great
Fri Mar 29, 2019 9:21 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2934
Views: 701007

Re: Miscellaneous Science Questions

Pfhorrest wrote:Yeah, the mapping of complex numbers to R2 was taken as obvious in my post; the mapping of R to R2 is what I was unsure about.

That would be the space-filling curve you mentioned.
by Eebster the Great
Fri Mar 29, 2019 8:24 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

Well, the mainstream linguistics considers the river name "Karašica" to be related to the obsolete Croatian word "karaš", for "goldfish", but there are no goldfishes there (and there is, as far as I know, no evidence that there have ever been), and neither is that the ...
by Eebster the Great
Fri Mar 29, 2019 8:09 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2934
Views: 701007

Re: Miscellaneous Science Questions

A space-filling curve maps R to R 2 or R 3 or larger and can be constructed for any finite dimension n using existing techniques. The complex numbers are trivially identified with R 2 by z ↦ (Re[z],Im[z]), or vice-versa: (x,y) ↦ x + yi. So if you just compose that with any curve that fills the plane...
by Eebster the Great
Thu Mar 28, 2019 9:01 pm UTC
Forum: Language/Linguistics
Topic: Is linguistics a real science?
Replies: 52
Views: 3920

Re: Is linguistics a real science?

Right, but "I can't see it" is not a scientific argument. You should search the literature to see how much is already known about the etymologies of these river names and of other river names. You should see whether the k-r pattern is specific to rivers or if it also shows up in other voca...
by Eebster the Great
Thu Mar 28, 2019 4:05 am UTC
Forum: Individual XKCD Comic Threads
Topic: 2129: "1921 Fact Checker"
Replies: 49
Views: 4943

Re: 2129: "1921 Fact Checker"

I wonder if it's just a one-off, or if "Really Not Important" was a recurring (humorous) bit in that paper. Maybe they just found they had a few inches to fill that day? The world may never know.

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