Search found 160 matches

by DavidSh
Sat Dec 08, 2018 8:43 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2082: "Mercator Projection"
Replies: 26
Views: 1140

Re: 2082: "Mercator Projection"

balthasar_s wrote: The planet closest to the sun? cool! :wink:
I wonder which projection is used for maps there.


NASA used a mix of Mercator for equatorial regions, Lambert Conformal for mid-latitudes, and Polar Stereographic for polar regions. Now I want a complete set of planetary and asteroidal atlases.
by DavidSh
Wed Dec 05, 2018 4:40 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2066: "Ballot Selfies"
Replies: 110
Views: 6780

Re: 2066: "Ballot Selfies"

And now we are seeing, in North Carolina, the problems with absentee ballots and people who don't follow the protocols.
by DavidSh
Wed Dec 05, 2018 4:27 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2081: Middle Latitudes
Replies: 27
Views: 1185

Re: 2081: Middle Latitudes

I think the characters are talking about places actually north of the arctic circle, such as Tromsø or Hammerfest, rather than Reykjavik. At Tromsø, the sun has been down for about a week already, and you get 5 hours of civil twilight in the middle of the day instead. --- And then at Longyearbyen, c...
by DavidSh
Sun Dec 02, 2018 4:47 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2079: "Alpha Centauri"
Replies: 32
Views: 1788

Re: 2079: Alpha Centauri

The oldest version of "all of a planet's life forming a single consciousness" I can find is Isaac Asimov's Green Patches, from 1950. The method of interconnection isn't specified there, however.
by DavidSh
Fri Nov 30, 2018 8:31 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2079: "Alpha Centauri"
Replies: 32
Views: 1788

Re: 2079: Alpha Centauri

JPL says that they expect to have to turn off the last science instrument about 2025, because of low power levels. At the moment, they each have the Cosmic Ray Subsystem, Low Energy Charged Particles, Magnetometer, Plasma Wave Subsystem instruments functioning, and Voyager 2 also has the Plasma Sci...
by DavidSh
Fri Nov 30, 2018 4:21 pm UTC
Forum: News & Articles
Topic: The Darker Side of the News
Replies: 4190
Views: 578097

Re: The Darker Side of the News

Let's see, convicted felon, registered sex offender...so is Jeffrey Epstein up for Supreme Court Justice? Or head of the Fed? Secretary of the Treasury? Secretary of Commerce? US Attorney General? (Some might object that felons can't be any of the above. Easily overcome: "Pardon.") As of ...
by DavidSh
Wed Nov 28, 2018 3:33 pm UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 7962
Views: 605172

Re: Trump presidency

CorruptUser wrote:So... PBS?

Maybe they could package PBS and Voice of America into a new Department of Truth, after the fashion of the creation of the Department of Homeland Security. I think Congress would need to get involved.
by DavidSh
Fri Nov 23, 2018 5:28 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2076: "Horror Movies 2"
Replies: 41
Views: 2375

Re: 2076: "Horror Movies 2"

I hate roller coasters too, but that's mostly just because they discriminate against tall people. In what way do roller coasters descriminate against tall people? Leg room? Your head gets different accelerations from the heads of short people? What? "But why not *good* feelings?" romcoms,...
by DavidSh
Wed Nov 21, 2018 7:51 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2075: "Update Your Address"
Replies: 25
Views: 1833

Re: 2075: "Update Your Address"

I get it. You two are talking about Formosa.
by DavidSh
Wed Nov 21, 2018 7:07 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2075: "Update Your Address"
Replies: 25
Views: 1833

Re: 2075: "Update Your Address"

Eutychus wrote:There's a much simpler solution to all this: never move.

That still doesn't help if the empire you live under is dissolved.
by DavidSh
Wed Nov 21, 2018 6:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2073: "Kilogram"
Replies: 97
Views: 4981

Re: 2073: "Kilogram"

Correct, the raw satellite signal differences don't require a specific coordinate system. The raw satellite signals are also not GPS; GPS is a system for global positioning, which includes standards to system ically derive a position on the globe from those signals. The phrase "all four dimens...
by DavidSh
Mon Nov 19, 2018 6:02 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2073: "Kilogram"
Replies: 97
Views: 4981

Re: 2073: "Kilogram"

Good catch. It looks like the chart is wrong about it's definition of nautical miles. The nautical mile is actually actually one latitude minute (or 1 6^4 * 10 th of the way around the earth) or 6076.12 feet. Since the earth is somewhat oblate, the length of a latitude minute varies with latitude. ...
by DavidSh
Mon Nov 19, 2018 5:29 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2074: Airplanes and Spaceships
Replies: 40
Views: 2236

Re: 2074: Airplanes and Spaceships

Lockheed Martin is developing part of the Orion Multi-Purpose Crew Vehicle. Specifically, the Command Module. The Service Module is being developed by Airbus.
by DavidSh
Sat Nov 17, 2018 5:20 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2073: "Kilogram"
Replies: 97
Views: 4981

Re: 2073: "Kilogram"

Are these oz as in 1/16lb, or floz? And are floz standardized between US and imperial systems? (e.g. is a US pint exactly 4/5ths an imperial pint?) These are fluid ounces. The US fluid ounce is about 4% larger than the Imperial fluid ounce. The Imperial fluid volume system is based on the volume of...
by DavidSh
Fri Nov 16, 2018 8:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2073: "Kilogram"
Replies: 97
Views: 4981

Re: 2073: "Kilogram"

Indeed, what with inflation and all, I doubt you can buy beer so cheaply anywhere these days.

(Besides the question of what kind of pound, there is also the question of what kind of pint.)
by DavidSh
Thu Nov 15, 2018 9:57 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2072: "Evaluating Tech Things"
Replies: 35
Views: 2595

Re: 2072: "Evaluating Tech Things"

Researchers are flying drones into supercells. It's only a matter of time until one gets caught up in a tornado. But these aren't quadcopters, they are fixed-wing aircraft with 10 foot wingspans. This is an advertising page, but it gives the specifications.
by DavidSh
Sun Nov 11, 2018 10:33 pm UTC
Forum: Logic Puzzles
Topic: Switch
Replies: 3
Views: 519

Re: Switch

Concerning pex 's findings, Uniqueness of the solution shouldn't be surprising. You can write the problem as a linear equation over the integers modulo 2, in matrix form Ax=b, where x indicates the buttons you push, b is the vector of all ones, and A is a matrix where each row corresponds to the...
by DavidSh
Thu Nov 01, 2018 9:17 pm UTC
Forum: News & Articles
Topic: Where Aren't They Now (Obituaries)
Replies: 301
Views: 69955

Re: Where Aren't They Now (Obituaries)

If we are doing obits for robotic space probes, the asteroid probe Dawn has lost contact . Its last reaction wheel failed some time ago, and it is presumed to have now run out of hydrazine, and be unable to point its antenna at Earth. In an earlier blog post , JPL describe in heart-breaking detail w...
by DavidSh
Thu Nov 01, 2018 12:31 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2066: "Ballot Selfies"
Replies: 110
Views: 6780

Re: 2066: "Ballot Selfies"

Furthermore, without major restructuring of elections, they'd have to offer from potentially tens of thousands of different ballots. My ballot for the coming election includes both senators and local school board members. There is no single national ballot. Even just for the presidential election, d...
by DavidSh
Wed Oct 31, 2018 3:56 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2066: "Ballot Selfies"
Replies: 110
Views: 6780

Re: 2066: "Ballot Selfies"

If you can prove to people how you voted, you can more easily sell your vote. Similarly, other people can pressure you into voting a certain way, and into using a ballot selfie to prove you were compliant.

As it is now, no one can expect you to back up any claim you make about your vote.
by DavidSh
Tue Oct 30, 2018 3:20 pm UTC
Forum: Fictional Science
Topic: Asimov's 3 laws
Replies: 17
Views: 3054

Re: Asimov's 3 laws

I don't know if this is an Asimov short story or just an Asimovesque one, but there's on tale where a robot crew descend to meet a ?Jovian? civilisation, who they accidentally astound by their high resilence ('leaky' spaceship, because anything else would crush or explode from space/gas-giant press...
by DavidSh
Sat Oct 27, 2018 3:30 pm UTC
Forum: Logic Puzzles
Topic: Sacrifice
Replies: 8
Views: 4199

Re: Sacrifice

What seems to me to be the natural solution is Number the 101 canisters 0 through 100, and label them in binary: 0000000 through 1100100. Then take 7 chickens, label them 1 through 7. For each bit K, K=1..7, mix a potentially detectable dose from the approximately 50 canisters for which bit K is set...
by DavidSh
Wed Oct 24, 2018 2:30 pm UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 7962
Views: 605172

Re: Trump presidency

gd1 wrote:Nationalism? So we will start supporting baseball and electing baseball players as officials? Cuz baseball is the national pastime right?

Nah, only the Washington Nationals, not the other teams. (I'd say that's Trump's home team, except that he spends a lot of his spare time in Florida.)
by DavidSh
Sat Oct 20, 2018 5:12 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2061: "Tectonics Game"
Replies: 69
Views: 9749

Re: 2061: "Tectonics Game"

You'd surely want to go with some sort of radioactive power source, like they use on the Voyager spacecraft. The RTGs NASA uses employ Plutonium-238, which has a half-life of about 88 years. If you want to be generating a reasonable amount of power after a couple of thousand years, you'd need to be...
by DavidSh
Fri Oct 19, 2018 7:24 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2061: "Tectonics Game"
Replies: 69
Views: 9749

Re: 2061: "Tectonics Game"

It reminds me of how much a misnomer the Real TIme Strategy genre of games is. In the real world, strategies can take years to unfold.
by DavidSh
Fri Oct 19, 2018 3:39 pm UTC
Forum: Language/Linguistics
Topic: Language fleeting thoughts
Replies: 135
Views: 34155

Re: Language fleeting thoughts

Right, beer you use for the bubble chamber.
by DavidSh
Mon Oct 15, 2018 3:53 pm UTC
Forum: Coding
Topic: write a C++ please
Replies: 18
Views: 4157

Re: write a C++ please

That's all very nice, but the original specification was for "integers", not "positive integers". You need a new class, and take care not to distinguish between positive zero and negative zero.
by DavidSh
Wed Oct 10, 2018 5:29 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2057: "Internal Monologues"
Replies: 48
Views: 5050

Re: 2057: "Internal Monologues"

The graphic design one seems more specialized, but then I've never really followed Law & Order.

Trees, I think, are mostly made up of air and water. At least, cellulose and lignin are carbon, oxygen, and hydrogen derived from those.
by DavidSh
Tue Oct 09, 2018 6:02 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2056: Horror Movies
Replies: 57
Views: 5922

Re: 2056: Horror Movies

da Doctah wrote:I didn't say I was scared. I said I didn't get them.

Same with parades. Stand by the side of the road and watch a bunch of trucks and people in uniforms walk by. How is that fun?

I wait for a band to come by, and then I follow it. That's fun for me.
by DavidSh
Mon Oct 01, 2018 8:40 pm UTC
Forum: News & Articles
Topic: British EU referendum in June [update: Leave wins 52% - 48%, politics ensue]
Replies: 1233
Views: 185830

Re: British EU referendum in June [update: Leave wins 52% - 48%, politics ensue]

I don't see what would avoid a hard border, other than
  • Reverse Brexit
  • Separate Northern Ireland from the UK
  • Annex (Southern) Ireland
by DavidSh
Tue Sep 18, 2018 3:18 pm UTC
Forum: News & Articles
Topic: The Thread To Remind Me We're Living In The Future
Replies: 1853
Views: 320643

Re: The Thread To Remind Me We're Living In The Future

Do animals have the same antigens as humans though? It appears that apes and old world monkeys have the ABO system of antigens. See http://www.pnas.org/content/109/45/18493 . Important functional parts of the antigens are the same across species, but I can't tell from the paper how much difference ...
by DavidSh
Fri Sep 14, 2018 10:23 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2046: "Trum-"
Replies: 38
Views: 5156

Re: 2046: "Trum-"

I think the Johnson presidents (Andrew and Lyndon) make a better claim for being unrelated than the Roosevelt presidents.
by DavidSh
Fri Aug 31, 2018 10:24 pm UTC
Forum: Mathematics
Topic: random k-sat
Replies: 1
Views: 1529

Re: random k-sat

Have you done Monte-Carlo experiments to indicate whether either of your desired results is likely to be true? Also, if you allow for k=1, you can more easily analyze that case. For k=1, the results on the Birthday Problem suggest that if you have on the order of sqrt(n) terms, the chance of having ...
by DavidSh
Wed Aug 29, 2018 2:27 pm UTC
Forum: Mathematics
Topic: "Generalized" polygons?
Replies: 10
Views: 1506

Re: "Generalized" polygons?

It's probably better to parse it as "generalized (pentagonal number)" rather than "(generalized pentagon)al number". They seem to be created by taking the formula for pentagonal numbers, and plugging in negative numbers for the length of a side.
by DavidSh
Tue Aug 28, 2018 3:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2038: "Hazard Symbol"
Replies: 44
Views: 5449

Re: 2038: "Hazard Symbol"

Soupspoon wrote:There deserves to be a few more portmanteau signs based upon the various ones in the range. And beyond.

I see there is an official warning sign for Guard Dog, but none for Sharks, Alligators, or Octopodes. How do you appropriately placard the moat?
by DavidSh
Mon Aug 27, 2018 5:48 pm UTC
Forum: Mathematics
Topic: multiplication xor
Replies: 2
Views: 1082

Re: multiplication xor

There does not exist a, b in {0,1} such that for all s, t in {0,1}, ( (s*t) xor 1) = (s xor a)*(t xor b).
by DavidSh
Fri Aug 24, 2018 9:15 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2037: "Supreme Court Bracket
Replies: 15
Views: 3279

Re: 2037: "Supreme Court Bracket

On the other hand, Dred Scott vs Sanford was a US Supreme Court case, and more well-known than many listed in the bracket. Though I can guess why it wasn't included.
by DavidSh
Fri Aug 24, 2018 2:49 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2037: "Supreme Court Bracket
Replies: 15
Views: 3279

Re: 2037: "Supreme Court Bracket"

⋅ Did the "Virginia is for Lovers" slogan come out after Loving vs. Virginia ? ⋅ Connecticut gets everything west of Narraganset Bay, Massachusetts gets everything in the Bay and east of it, and New York gets Block Island. ⋅ Following the tennis is space prec...
by DavidSh
Mon Aug 20, 2018 10:13 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 14990
Views: 2382825

Re: In other news... (humorous news items)

At the end of the article: The escape came less than a week after about 100 goats went on the lam in Idaho, munching their way through a suburban Boise, Idaho, neighborhood in an incident dubbed “Goat-a-Palooza 2018.” The animals were later wrangled onto a truck by the firm We Rent Goats, which app...
by DavidSh
Wed Aug 01, 2018 5:53 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2870
Views: 656573

Re: Miscellaneous Science Questions

Eebster the Great wrote:... because you can't throw a football nearly that far in a vacuum anyway.

That depends on another parameter, the acceleration of gravity. On a suitably sized asteroid, you might be able to throw a football that far. If your suit is sufficiently flexible.

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