Search found 62 matches

by x7eggert
Sun Apr 09, 2017 2:07 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 14636

Re: 1818: "Rayleigh Scattering"

Air is a colored material, but it's not a pigmented material. Air is indeed not a pigmented material, but it is also not a colored material. Not any more than you can say a CD is made of colored material, just because you can see colors on it when you light it in a particular way. Under diffuse whi...
by x7eggert
Sat Apr 01, 2017 7:52 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 14636

Re: 1818: "Rayleigh Scattering"

Not nececelery. There's a ton of IR re-emitted by warm things, and many insects (and snakes w/ 'thermalsensor pits') take advantage of this. Further, while the total wattage of solar IR is low-ish, the retina is a quantum detector (sorry, comic-woman figure!), and there are brazilions of IR photons...
by x7eggert
Sat Apr 01, 2017 7:38 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 14636

Re: 1818: "Rayleigh Scattering"

So apparently plants reflect green light because there's more green light than any other color in sun's radiation, and so it would be too easy to get sunburnt if a pigment absorbed it. I heard (unconfirmed) that the plants are the second to use photosynthesis, before that there were organisms using...
by x7eggert
Sat Mar 18, 2017 12:55 am UTC
Forum: What If?
Topic: What-If 0156: "Electrofishing for Whales"
Replies: 23
Views: 10270

Re: What-If 0156: "Electrofishing for Whales"

Sandor wrote:Traditionally, you grab your bootstraps if you want to pull your feet off the ground, not your ankles.

For that you'd grab your own beard, just like you do when pulling yourself out of a swamp.
by x7eggert
Wed Jan 11, 2017 4:44 am UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 128
Views: 37051

Re: What-If 0073: "Lethal Neutrinos"

You are thinking much too complicatedly. Just throw the supernova into the black hole before it goes boom. :-) That's a terrible idea. Most of the star's mass wouldn't fall into the black hole and instead produce an accretion disk. Now, accretion disks are fantastically efficient at converting matt...
by x7eggert
Wed Jan 11, 2017 4:41 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1783: "Emails"
Replies: 26
Views: 3725

Re: 1783: "Emails"

But you know what's worse than the e-mail provider filtering out what they think is spam? The e-mail provider sending you spam, because apparently somewhere along the line you agreed to it while registering on their (otherwise pretty unsophisticated) service. When I saw the first one I thougth they...
by x7eggert
Thu Jan 05, 2017 11:29 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1779: "2017"
Replies: 71
Views: 8849

Re: 1779: "2017"

Edit: Anyway, I though that according to various right-wing-arseholes, saying this sort of carp online is just freezepeach, not violence. The real violence is the Trumpists kicking seven shades of shit out of people at his rallies. Off cause it is - if _they_ do it. Their lies and hate crimes are &...
by x7eggert
Thu Jan 05, 2017 10:35 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1781: "Artifacts"
Replies: 35
Views: 4820

Re: 1781: "Artifacts"

Carteeg_Struve wrote:
Title text "I didn't even realize you could HAVE a data set made up entirely of outliers."


Of course. It's usually called "propaganda".


Usually people don't know what "propaganda" means.
by x7eggert
Thu Dec 15, 2016 9:51 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1770: "UI Change"
Replies: 56
Views: 9917

Re: 1770: "UI Change"

So you like toolbars instead of ribbons? How do you even? No. It takes half a minute to hide/show all the toolbars and they usually contain only a set of ambiguous 16x16 icons. As a bonus the ribbon is the same across all installations, instead of being a mess of toolbars wherever you go. Toolbar i...
by x7eggert
Sat Dec 10, 2016 1:27 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1770: "UI Change"
Replies: 56
Views: 9917

Re: 1770: "UI Change"

I like ribbons. In the programs where they belong of course, like the office programs that just have a tremendous set of buttons —the ones in file explorer and paint are clealy bugs that the guys at MS refuse to fix. The best part is indeed that you can (auto) hide the contents of the ribbon with a...
by x7eggert
Fri Dec 09, 2016 7:33 pm UTC
Forum: What If?
Topic: What-If 0073: "Lethal Neutrinos"
Replies: 128
Views: 37051

Re: What-If 0073: "Lethal Neutrinos"

You are thinking much too complicatedly. Just throw the supernova into the black hole before it goes boom. :-)
by x7eggert
Mon Oct 31, 2016 7:39 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1752: "Interplanetary Experience"
Replies: 47
Views: 6139

Re: 1752: "Interplanetary Experience"

The explainxkcd entry for this comic mentions the variation of the Mercurian daytime temperature, from exceedingly hot at the equator (and other latitudes) to very cold at the poles. So I figured that there must be a latitude at which the temperature is a comfortable room temperature. I found this ...
by x7eggert
Mon Oct 31, 2016 7:18 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1752: "Interplanetary Experience"
Replies: 47
Views: 6139

Re: 1752: "Interplanetary Experience"

I saw the dreamy Prof Cox dropping a feather and cannonball in there on one of his series. It was a bit disappointing somehow - they showed it only in slow motion or something, so the feather didn't seem to drop like a stone. ETA: yes, that's exactly what they did . I guess the director thought it ...
by x7eggert
Fri Oct 28, 2016 1:06 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1751: "Movie Folder"
Replies: 57
Views: 7446

Re: 1751: "Movie Folder"

The subtractive convention in Roman numerals always seemed pointless. You save a tiny amount of space on the page and writing time and increase learning difficulty and reading time. It's way easier to learn and to read that you start with big values and add successive smaller ones, and worst case s...
by x7eggert
Wed Sep 28, 2016 7:34 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 9385

Re: 1738:"Moon Shapes"

(I say "probably" because I'm not totally sure how the human visual system responds to only one photoreceptor being stimulated). A photon hitting a receptive cell is either perceived as white or as a pure color. Color-sensitive receptors may signal their color or white, depending on where...
by x7eggert
Tue Sep 27, 2016 9:16 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1738:"Moon Shapes"
Replies: 66
Views: 9385

Re: 1738:"Moon Shapes"

(I say "probably" because I'm not totally sure how the human visual system responds to only one photoreceptor being stimulated). A photon hitting a receptive cell is either perceived as white or as a pure color. Color-sensitive receptors may signal their color or white, depending on where...
by x7eggert
Tue Sep 27, 2016 9:10 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

What surprises me is that nobody has questioned why freight in the US train system is driven by diesel. Which drives electric motors. https://en.wikipedia.org/wiki/Diesel-electric_transmission "Diesel-electric powerplants became popular because they greatly simplified the way motive power was ...
by x7eggert
Wed Sep 21, 2016 11:25 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Tyndmyr wrote:If you start with accepting A as a premise, and conclude with !A, logically, you done fucked up.


Didi you ever disprove something by contradiction?
by x7eggert
Sun Sep 18, 2016 4:10 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

He also believes that animals consuming plants negates their carbon-sequestration. Because only dead plants, and not dead animals, contain carbon? The carbon content of animal dung is also zero, apparently. The 'skeptics' love to go on about how complex all the modeling is and how we can't make any...
by x7eggert
Sun Sep 18, 2016 3:37 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

I don't believe that will be forthcoming. That he "reads papers and the people who do the maths agree with him" was the citation I got for water not being an important greenhouse gas (and that it is, in fact, the reverse: that warming causes water vapor, and water vapor cannot hold heat b...
by x7eggert
Sun Sep 18, 2016 3:34 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Some warming events were caused by volcanoes, It's hard to explain volcanic CO₂ with increased temperatures. Citation please? Volcanoes cause cooling in the short term (atmospheric dust) and generally don't have a long term effect. Volcanoes produce very low quantities of durable greenhouse gases l...
by x7eggert
Sun Sep 18, 2016 2:48 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Here is a serious looking proposal to use railroad technology to store hundreds of megawatt hours by moving many railroad car sized weights up a mountain, http://www.aresnorthamerica.com/grid-scale-energy-storage https://s3.amazonaws.com/siteninja/multitenant/images/8856/images/slide/Frame5701.jpg?...
by x7eggert
Sun Sep 18, 2016 2:24 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Wind has the same problem. I have decent wind resources, but too many trees. Would have to build the tower(s) really high. As far as I know, building high (above where animals fly) is a good idea, also it gives you more profit _and_ is supposed to be less noisy because of the distance to the ground...
by x7eggert
Sun Sep 18, 2016 2:11 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Oh, I fully agree, and the more nuclear the better as far as I am concerned. Nuclear is perfect, as long as it's not controlled by greedy companies that could as well just use Jurassic Parc's security and as long as somebody else will bury the waste. "Do not build below this stone on this coas...
by x7eggert
Sun Sep 18, 2016 1:54 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

there's no way we could know it to the precision needed to produce a graph of it over the timescales used here. Except for e.g. _yearly_ growth rate of trees for the past 13 500 years. Sediments, Stalactites and Oxygen isotopes do help, too. We can also measure the strength of the sun by the amount...
by x7eggert
Thu Sep 15, 2016 1:06 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

I think water vapor is not that significant because if you just create water vapor, it rains. But if you are right, how do you create water vapor? By heating water, by using energy. If you stop spending excessive amounts of money on your energy bill, you'll be reducing both CO₂ and water. Wikipedia...
by x7eggert
Thu Sep 15, 2016 12:37 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Co-occurrence does not prove causality. Even if those facts are plainly admitted, it requires that one believe CO 2 increases cause temperature increases, which is a subject of some debate. There is some historical evidence that the causal link, if one exists, is the opposite - that temperature inc...
by x7eggert
Wed Sep 14, 2016 11:36 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

Also, the graph is disingenuous. It claims that the brief period of the last twenty thousand years is what people mean when they say "the temperature has changed before". I don't think that's true and it's certainly not a sufficient time scale to make the sort of point this comic attempts...
by x7eggert
Wed Sep 14, 2016 11:23 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1732: "Earth Temperature Timeline"
Replies: 523
Views: 60631

Re: 1732: "Earth Temperature Timeline"

A couple of quick unrelated observations: One, CO2's absorption spectrum overlaps water's by quite a large amount. Considering that there is far more water in the atmosphere than CO2, even a minor fluctuation in overall humidity will have a greater effect than a huge fluctuation in CO2. Note that a...
by x7eggert
Wed Jul 20, 2016 2:28 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1708: "Dehydration"
Replies: 109
Views: 11218

Re: 1708: "Dehydration"

There's where the citation is needed, see? Let's count some assumptions: - Waste products disposed of in urine are all the same color; - This color is strong enough that if you don't see it, there must not be any waste; - The color of urine is only from the waste products, and not some other random...
by x7eggert
Mon Mar 28, 2016 1:26 pm UTC
Forum: What If?
Topic: What-If 0148: "Eat the Sun"
Replies: 40
Views: 14516

Re: What-If 0148: "Eat the Sun"

Draco18s wrote:
ps.02 wrote:
slinches wrote:What's with the Google maps link to Lexington KY?

The link text says "Citation needed" so the link is to Citation Blvd.

What you missed was the restaurant hovering nearby. Something about reptiles and being hot as a furnace.

Hovering restaurants are somebody else's problem.
by x7eggert
Mon Mar 28, 2016 12:54 pm UTC
Forum: What If?
Topic: What-If 0146: "Stop Jupiter"
Replies: 60
Views: 14534

Re: What-If 0146: "Stop Jupiter"

I still want to know the answer to the original what if question. Assume that some alien civilisation wants to cause Jupiter to impact our sun. These distant aliens have developed a mass driver that can launch an insane number of payloads that will reach our solar system with a trajectory such that...
by x7eggert
Tue Feb 16, 2016 10:08 am UTC
Forum: What If?
Topic: What-If 0145: "Fire From Moonlight"
Replies: 157
Views: 34570

Re: What-If 0145: "Fire From Moonlight"

If, like sb said, the black body temperature of the light would determine the maximum heat of a target, wouldn't it be possible to filter out the low frequencies to make moonlight resemble sunlight? Filtering would use energy, so "Lenses and mirrors work for free; they don't take any energy to ...
by x7eggert
Mon Feb 08, 2016 1:58 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1639: "To Taste"
Replies: 55
Views: 7045

Re: 1639: "To Taste"

What difference? I don't have "coffee mugs" or "tea mugs" or whatever; I have a bunch of "mugs" that I use for drinking hot beverages in general, and milk. At least for some coffee mugs, everything you drink will taste like coffee. (Same for some tea mugs etc.) If you ...
by x7eggert
Sun Feb 07, 2016 4:23 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1639: "To Taste"
Replies: 55
Views: 7045

Re: 1639: "To Taste"

What difference? I don't have "coffee mugs" or "tea mugs" or whatever; I have a bunch of "mugs" that I use for drinking hot beverages in general, and milk. At least for some coffee mugs, everything you drink will taste like coffee. (Same for some tea mugs etc.) If you ...
by x7eggert
Sun Feb 07, 2016 5:17 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1639: "To Taste"
Replies: 55
Views: 7045

Re: 1639: "To Taste"

Also: How warm is warm? We have 280 K outside, it's pretty warm!
by x7eggert
Mon Nov 16, 2015 8:21 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1604: "Snakes"
Replies: 66
Views: 10169

Re: 1604: "Snakes"

pF adder. Very good. I didn't know this rhyme (or anything about the snakes in question) but there is one about switching drinks mid session that goes something like "beer on wine, feeling fine, wine on beer, feeling queer". It has a similar issue to that described above, in that nobody i...
by x7eggert
Mon Nov 16, 2015 1:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1604: "Snakes"
Replies: 66
Views: 10169

Re: 1604: "Snakes"

orthogon wrote:According to the fantastic Wikipedia article (I particularly like the plot of cumulative probability of finishing a game after N turns), there's a game-of-skill version called "Adders and ladders".


Is that the UK version?
by x7eggert
Mon Nov 16, 2015 11:43 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1604: "Snakes"
Replies: 66
Views: 10169

Re: 1604: "Snakes"

The picture looks like yellow-red-yellow-black.
by x7eggert
Sat Jul 25, 2015 11:51 am UTC
Forum: What If?
Topic: What-If 0137: "New Horizons"
Replies: 62
Views: 22659

Re: What-If 0137: New Horizons

I guess there is a missing word.
"Hopefully, New Horizons is currently flying past Pluto. But don't worry; if it somehow hits your car instead, the US government will cover things ..."

... up?

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