Search found 3288 matches

by Eebster the Great
Wed Jan 30, 2019 2:08 am UTC
Forum: Mathematics
Topic: Fractions help.
Replies: 13
Views: 2964

Re: Fractions help.

TIL all meanings of the English word "check" derive from terms medieval Frenchmen used in reference to or while playing chess, and thus ultimately from the Persian word "shah." I guess if a hockey player checks me, he is threatening to capture me. And if I check your coat, I am r...
by Eebster the Great
Wed Jan 30, 2019 12:25 am UTC
Forum: Science
Topic: Can a thruster using geomagnetic fields and superconductors generate a thrust?
Replies: 9
Views: 2777

Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Not quite the same thing, but I was wondering if there was a way to turn a receiving laser beam into electricity. The device is, unfortunately, called a " rectenna ." A concept has been floating around for almost fifty years that we could put solar panels in orbit and send energy by maser...
by Eebster the Great
Wed Jan 30, 2019 12:19 am UTC
Forum: Language/Linguistics
Topic: IPA joke
Replies: 10
Views: 5381

Re: IPA joke

Yeah, "beer" is a diphthong for me for sure. Probably for everyone?
by Eebster the Great
Wed Jan 30, 2019 12:14 am UTC
Forum: Mathematics
Topic: Fractions help.
Replies: 13
Views: 2964

Re: Fractions help.

It might be true that number lines are not very useful for understanding negative multiplication, but I feel like answering the implied question anyway. Multiplying really does two things on the number line, not just one. Multiplying by a real number scales by its magnitude and reflects by its sign....
by Eebster the Great
Tue Jan 29, 2019 2:00 pm UTC
Forum: Science
Topic: Consequences of climate change
Replies: 90
Views: 27105

Re: Consequences of climate change

You need an international agreement, which is the whole point of all these agreements we were signing until something happened a couple years back.
by Eebster the Great
Mon Jan 28, 2019 3:14 pm UTC
Forum: Science
Topic: "Absolute" vs "Relative" humidity
Replies: 3
Views: 1648

Re: "Absolute" vs "Relative" humidity

If I evaporate an ounce of water in a cubic yard, I have an absolute humidity of one ounce per cubic yard. It's just how much water vapor there is. Sometimes it's cold and some of that water condenses and forms dew. That means the relative humidity is above 100%. But sometimes it's hot and the water...
by Eebster the Great
Mon Jan 28, 2019 2:57 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

I don't think your nerves can function at all anaerobically. Apparently they can use lactate to briefly maintain ion homeostasis, during which time you would arguably be "not dead" in the sense that if all your mitochondria magically reappeared, it''s just conceivable that you could be rev...
by Eebster the Great
Mon Jan 28, 2019 5:51 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

It would be almost immediate, even faster than cutting off oxygen to the brain.
by Eebster the Great
Mon Jan 28, 2019 4:36 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

They would die.
by Eebster the Great
Sat Jan 26, 2019 9:58 pm UTC
Forum: Science
Topic: Consequences of climate change
Replies: 90
Views: 27105

Re: Consequences of climate change

To bring things down to earth, the current reality is that green energy is overall more expensive than conventional energy unless externalities are considered. There is not, at present, a mechanism to internalize those costs, and the free market has not found a solution. So if we are serious about d...
by Eebster the Great
Fri Jan 25, 2019 6:48 am UTC
Forum: Mathematics
Topic: Fractions help.
Replies: 13
Views: 2964

Re: Fractions help.

These responses should make the formal math pretty clear, but I'll try to give more intuition. One way to view division is finding the height of a rectangle whose area is the dividend and whose width is the divisor. For instance, 12 / 3 can be viewed as finding the length of a rectangle with width 3...
by Eebster the Great
Wed Jan 23, 2019 11:07 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

I always thought a device was "electronic" if it utilized electrical logic gates. So like, a radio is electronic, but a light bulb is not. I guess that does leave devices like telegraphs, telephones, and facsimile machines in a state of limbo depending on the details of their construction.
by Eebster the Great
Mon Jan 21, 2019 8:28 pm UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 57
Views: 11277

Re: disproof of boltzman brain?

This sounds exactly like what we said earlier in the thread. To the last point, there does indeed have to be some more probable way to cause inflation than the universe spontaneously tunneling into a singularity or whatever, but there are already many proposals for such mechanisms. Regardless of any...
by Eebster the Great
Mon Jan 21, 2019 8:03 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

gd1 wrote:How big is infinitesilarge?

Google returns no results at all.
by Eebster the Great
Mon Jan 14, 2019 7:17 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 152375

Re: Math: Fleeting Thoughts

A majority of US states actually also prohibit first cousin marriage. North Carolina has the odd distinction of being the only state to allow single first cousin marriages but not double first cousin marriages. Sex is more broadly legal though.
by Eebster the Great
Mon Jan 14, 2019 6:00 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 152375

Re: Math: Fleeting Thoughts

If someone's son is their brother, they reproduced with their mother or father. Which, in addition to having a much higher rate of defects, is also fucked up in loads of other ways that often wouldn't apply to (even double first) cousins. Yeah, the kid's parent is also his grandparent. It's fucked ...
by Eebster the Great
Mon Jan 14, 2019 4:35 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 152375

Re: Math: Fleeting Thoughts

One's son shouldn't be one's sibling... The moral injunctions of Exodus can really go take a hike. 2019, brah. Since this is the math forum, it's worth mentioning that the detrimental genetic effects from such a union are statistically significant but practically very small, in contrast to popular ...
by Eebster the Great
Mon Jan 14, 2019 10:18 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711678

Re: Miscellaneous Science Questions

It also makes me wonder what is the defining distinction between carnivores and omnivores if even a "hypercarnivore" can get nearly a third of its energy from plants. At a guess, an omnivore can survive purely on a herbivore diet, but a carnivore must have meat. I believe that is a facult...
by Eebster the Great
Mon Jan 14, 2019 3:42 am UTC
Forum: Mathematics
Topic: Calculate Mass from Time Dilation and Radius
Replies: 4
Views: 1812

Re: Calculate Mass from Time Dilation and Radius

So you are just doing 1 - 1/γ? I don't understand your objective. Anyway, the range is 0-1, not 0.1-1. You cannot calculate the mass of an object just by its radius and the gravitational field on the surface unless you know some additional things about it, like that its density is distributed with s...
by Eebster the Great
Sun Jan 13, 2019 6:06 am UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 152375

Re: Math: Fleeting Thoughts

I think it is well accepted that 1% = 0.01. The question is the meaning of angle measure. The terse Complex Analysis text I just conveniently lost defined the radian measure according to the Taylor series that could most conveniently fit the desired properties. Clearly one measure is way more conven...
by Eebster the Great
Sun Jan 13, 2019 4:39 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

Exoplanar mining.png The negative 270 degree temperature might be a bummer. Where are you getting that number from? What I notice is that (1) the pits seem to be of different depths, and this might mean surface air pressures are significantly different, and (2) the "ice" must be incredibl...
by Eebster the Great
Sat Jan 12, 2019 6:27 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

Sableagle wrote:Exoplanar mining.png

The negative 270 degree temperature might be a bummer.
by Eebster the Great
Sat Jan 12, 2019 6:38 am UTC
Forum: Science
Topic: Copper in vacuum thermos
Replies: 10
Views: 4994

Re: Copper in vacuum thermos

That actually makes a lot of sense. I mean, for a 14 oz mug with a simple plastic top, this sort of thing is probably mostly just marketing like you said, but for a srs thermos, maybe it would matter somewhat. Just in case you are the kind of guy to pack your soup a full day before you intend to eat...
by Eebster the Great
Sat Jan 12, 2019 6:28 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 296
Views: 50756

Re: Science fleeting thoughts

Sableagle's G differs from the CODATA value of 6.674 08(31) × 10 -11 m 3 kg -1 s -2 in the third decimal place. But it doesn't matter because the precision was not the point. Still, that is an astonishingly precise measurement. The sun's μ is even more precisely known, at 1.327 124 400 18(9) × 10 20...
by Eebster the Great
Sat Jan 12, 2019 6:14 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711678

Re: Miscellaneous Science Questions

The Wikipedia article says "A hypercarnivore is an animal which has a diet that is more than 70% meat, with the balance consisting of non-animal foods [...]." So clearly it is using "meat" to refer to any animal matter, not just skeletal muscle. The term "hypercarnivore"...
by Eebster the Great
Fri Jan 11, 2019 3:14 pm UTC
Forum: Mathematics
Topic: Favorite Mathematical Equation
Replies: 87
Views: 18624

Re: Favorite Mathematical Equation

Therefore the solution set to the polynomial equation x2 - x = 0 is x ∈ {0,1} = 2.

x∈2. It just sounds wrong.
by Eebster the Great
Thu Jan 10, 2019 7:22 pm UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 13272

Re: quarkcosh1's miscellaneous science posts

What is interesting is the possibility that, starting N digits down Pi and thence every Mth digit, you might find just 2,2,2,2… forever. For arbitrary, possibly transfinite , N and M, that mesh nicely into every other sequence being looked for. Every digit of a real number is at a finite position.
by Eebster the Great
Thu Jan 10, 2019 7:12 pm UTC
Forum: Science
Topic: What is my Exact Mailing Address?
Replies: 11
Views: 3393

Re: What is my Exact Mailing Address?

It doesn't say the term is archaic. It says that generally in English, we now call North and South America distinct continents, while "The Americas" collectively refers to both, and "America" most often refers to the U.S. What is archaic is referring to The Americas / the America...
by Eebster the Great
Thu Jan 10, 2019 12:29 pm UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 4554

Re: Stars in background of deep-sky photos are in foreground

ucim wrote:You mean, by using alternative facts? :)

Yes. Also, if the Earth were an infinite flat plane, the gravitational field would not vary with altitude.
by Eebster the Great
Thu Jan 10, 2019 4:09 am UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 4554

Re: Stars in background of deep-sky photos are in foreground

I think his statement would be correct though if the distance to the moon were not so much greater than its diameter.
by Eebster the Great
Wed Jan 09, 2019 4:56 pm UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 13272

Re: quarkcosh1's miscellaneous science posts

Again, trying formulas at random because you feel like some of the special functions could be connected to the topic in some way is not science . The actual way these formulas are discovered is by creating mathematical models that are meaningful on their own and then finding that the model's predict...
by Eebster the Great
Tue Jan 08, 2019 8:47 pm UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 4554

Re: Stars in background of deep-sky photos are in foreground

Yeah, I feel like using a telescope to read a magazine might be overkill.
by Eebster the Great
Thu Jan 03, 2019 2:35 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 540
Views: 130780

Re: 1732: "Earth Temperature Timeline"

Great info! Do we know, out of these 4 contributors to global warming, what weight do each of them carry? The focus in the general public has been on carbon dioxide emissions. Some of these are factors are getting multiplied together, so you can't describe one as "mattering more" the way ...
by Eebster the Great
Mon Dec 31, 2018 7:09 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711678

Re: Miscellaneous Science Questions

I'm not sure there is any consistent way to have a universe with a definite start in the infinite past. But if there is, its age would still just be "countably infinite" and the current year could not be consistently assigned any ordinal. If it were, either it would be a limit ordinal, in ...
by Eebster the Great
Mon Dec 31, 2018 9:18 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711678

Re: Miscellaneous Science Questions

I think actual, observed physics rules this out, but nothing logically prevents this from being the year "omega + 6000", where omega is the first transfinite ordinal. For the other view, I once had my freshman philosophy professor make the claim that tomandlu asked about. No, I do not thi...
by Eebster the Great
Fri Dec 28, 2018 9:58 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711678

Re: Miscellaneous Science Questions

I think tomandlu is imagining starting at some particular point and then reaching an infinite future, which does seem impossible, since infinity is unreachable. It's certainly true that the universe cannot have started "infinity years ago," because if the universe is infinitely old, it had...
by Eebster the Great
Wed Dec 26, 2018 12:43 am UTC
Forum: Science
Topic: Childhood (not so) crackpot theories
Replies: 435
Views: 73201

Re: Childhood (not so) crackpot theories

It's hard for me to visualize a fly "thinking." I know that they do, in the sense that they make decisions, learn, remember, etc., but their lack of any true brain makes me suspect their cognitive processes are very different from mine. But I would be willing to believe that for a good def...
by Eebster the Great
Sun Dec 23, 2018 12:19 am UTC
Forum: Mathematics
Topic: Favorite Mathematical Equation
Replies: 87
Views: 18624

Re: Favorite Mathematical Equation

doogly wrote:
Carmeister wrote:I don't think that's an equation.

It's equal to something, just left as an exercise to the reader. Which is everyone's favorite, really.

WolframAlpha gives a solution in the form of the upper incomplete gamma function, which seems a bit like cheating.
by Eebster the Great
Sat Dec 22, 2018 8:29 am UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 13272

Re: quarkcosh1's miscellaneous science posts

What are the morphisms in this 2-category? I don't get it at all. There is some actual physical reason the dimensionless constants have the values they do (though there might not be a good reason), but we can't figure that reason out just by looking at random lists of mathematical expressions until ...
by Eebster the Great
Thu Dec 20, 2018 11:55 am UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 13272

Re: The fine structure constant and the quark mass ratios derived from the j invariant

Doing a bunch of random, unmotivated calculations and attempting to spot similar numbers by eye is not a derivation. It's not even really numerology. It's not even not even wrong.

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