Search found 611 matches

by keithl
Fri Dec 29, 2017 9:11 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1935: "2018"
Replies: 66
Views: 5079

Re: 1935: "2018"

2018 is not divisible by ANY of the first 49 Mersenne primes. But how about the larger ones? We will probably have to try all of them, just to make sure that 2018 is cryptologically secure.
by keithl
Fri Dec 01, 2017 9:00 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1923: "Felsius"
Replies: 78
Views: 5805

Re: 1923: "Felsius"

Melting point and boiling point of ... water? Those temperatures are only "standard" at 101 kPascal (one "standard" atmosphere of dry nitrogen/oxygen). At very high or very low pressures, where 99.99% of the water in the solar system can be found, the temperatures are different. ...
by keithl
Fri Dec 01, 2017 8:46 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1923: "Felsius"
Replies: 78
Views: 5805

Re: 1923: "Felsius"

Planck units. The Planck temperature is 1.4168e32K, also known as an "absolute hotness" of 1.0. That way, if anyone asks you the temperature, you can say "close to zero" and be right every time - even if you are at the core of an exploding supernova. Added note: It is about 2 mic...
by keithl
Wed Nov 15, 2017 8:53 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1916: "Temperature Preferences"
Replies: 82
Views: 7036

Re: 1916: "Temperature Preferences"

... Minnesotans are tough. Or dumb. Both, really. How did anyone get tricked into living here in the first place? Anecdotally, by telling new immigrants that it lies at the same latitudes as places like Venice and Paris... Two of my great-grandparents were "probably" imported from Finland...
by keithl
Wed Nov 15, 2017 8:02 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1916: "Temperature Preferences"
Replies: 82
Views: 7036

Re: 1916: "Temperature Preferences"

The Moon should be on this chart; equatorial surface temperatures range from 127C to -173C over the one month "day". On the chart, way beyond the lower right, somewhere near the middle button of your right-hand-side mouse. Fortunately for visitors, it is a very dry heat, with no snowstorms...
by keithl
Mon Nov 13, 2017 6:56 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1915: "Nightmare Email Feature"
Replies: 20
Views: 2736

Re: 1915: "Nightmare Email Feature"

Longest delayed email reply? That's gotta be "What Hath God Wrought", the first long distance telegraph message from Washington DC to Baltimore in 1844. They have yet to receive a satisfactory reply. The reply I would send would be so controversial that this thread would run longer than &q...
by keithl
Fri Oct 20, 2017 5:53 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1905: "Cast Iron Pan"
Replies: 108
Views: 10159

Re: 1905: Cast Iron Pan

I used to filings-season my cast iron pans at the poles, but the magnetic field is too strong there; the residual magnetism in the pan ruined my best dishes. Now ESA launches them out of the Guiana Space Center for me. The field at 5 degrees north is still substantial, but a high parabolic trajector...
by keithl
Mon Oct 09, 2017 8:45 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1900: "Jet Lag"
Replies: 29
Views: 3412

Re: 1900: "Jet Lag"

I prefer random maritime disasters to scheduled maritime disasters, though the latter can be easier to avoid.
by keithl
Mon Oct 02, 2017 11:44 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1897: "Self Driving"
Replies: 57
Views: 5676

Re: 1897: "Self Driving"

Pssshht, pliers are so pro-ish noob. The real noobs strip wires with a pair of scissors or their teeth. Blimey, I'd forgotten about teeth. That was my preferred method for years. Did you stop when you were down to two teeth, or could you strip wire with the jagged remaining single tooth? edit: Seco...
by keithl
Mon Oct 02, 2017 4:52 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1897: "Self Driving"
Replies: 57
Views: 5676

Re: 1897: "Self Driving"

Self-driving cars? That's nothing. Microsoft just invented the self-flattening pedestrian. Shaped-charge exploding batteries in the Windows phone, ignited when a Google car passes closely. The phone appears undamaged. The results look just like vehicular homicide. See you in court, Page and Brin!
by keithl
Fri Sep 01, 2017 4:49 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1884: "Ringer Volume/Media Volume"
Replies: 38
Views: 5364

Re: 1884: "Ringer Volume/Media Volume"

Is it just me or does it seem that Google engineers just don't care about sane audio controls? The controls work great for Google's paying customers, the companies that pay to bombard you with advertisements. You (and the hapless people around you) are the product that Google delivers to advertiser...
by keithl
Wed Aug 23, 2017 4:02 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1880: "Eclipse Review"
Replies: 51
Views: 5688

Re: 1880: "Eclipse Review"

I watched it with 30 friends in Idaho Falls. Have you ever heard the rumble of a whole city cheering? Punctuated with police sirens; the cops were cheering, too. The familiar Sun is replaced with a strange new object in the sky: a vast corona. Venus is brighter than you have EVER seen it, seemingly ...
by keithl
Wed Aug 23, 2017 3:45 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1880: "Eclipse Review"
Replies: 51
Views: 5688

Re: 1880: "Eclipse Review"

Predicting supernovas How predictable is a supernova? I know that we can't currently predict them from the Earth, but if we were to send probes to a distant star, could those probes tell us when it was going to go supernova? The neutrino flux from a supernova goes off the charts in the hours before...
by keithl
Fri Jul 28, 2017 6:26 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1868: "Eclipse Flights"
Replies: 31
Views: 3810

Re: 1868: "Eclipse Flights"

There is no abrupt edge of a shadow as depicted. The eclipse begins an hour before, with the blockage of the Sun increasing towards totality, then decreasing for an hour after. In a vastly broader swath to the north or south of the path of totality, where the Moon "misses" the Sun a bit, ...
by keithl
Wed Jul 26, 2017 7:07 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1868: "Eclipse Flights"
Replies: 31
Views: 3810

Re: 1868: "Eclipse Flights"

Er ... uh ... There is no abrupt edge of a shadow as depicted. The eclipse begins an hour before, with the blockage of the Sun increasing towards totality, then decreasing for an hour after. In a vastly broader swath to the north or south of the path of totality, where the Moon "misses" th...
by keithl
Mon Apr 17, 2017 3:26 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1825: "7 Eleven"
Replies: 85
Views: 16457

Re: 1825: "7 Eleven"

They need 37 minutes per day to replace all the freeze dried and vacuum dessicated fruits and vegetables.

Oh, wait. 7/11 doesn't have any fruits and vegetables. Maybe they can sell silica gel packs instead. Yum!
by keithl
Fri Mar 31, 2017 9:41 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 18502

Re: 1818: "Rayleigh Scattering"

Regarding why plants and chlorophyll are green (ultimate, not proximate cause): Plants use the "green" pigment chlorophyll to process light because the first eukaryotic cells with chloroplasts evolved in the ocean, at depths where green light does not penetrate. Broader spectrum pigments m...
by keithl
Mon Mar 20, 2017 6:20 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1813: "Vomiting Emoji"
Replies: 45
Views: 8941

Re: 1813: "Vomiting Emoji"

Re: xkcd cartoons about emoji and vomiting ...
Image
by keithl
Wed Feb 15, 2017 6:53 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1799: "Bad Map Projection: Time Zones"
Replies: 70
Views: 10731

Re: 1799: "Bad Map Projection: Time Zones"

Greenland is stretched funny, probably because they get so little sun that its position in the sky (or below the southern horizon) has no bearing (ahem) on their schedules, while economic dealings with Europe do. Reforming this mess provides a great opportunity for regional defense. Greenlanders can...
by keithl
Wed Feb 01, 2017 7:53 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1793: "Soda Sugar Comparisons"
Replies: 132
Views: 20081

Re: 1793: "Soda Sugar Comparisons"

A 20 ounce "classic Coke" is 240 food calories, and a food calorie is 4184J, which is also the energy in a gram of TNT. So, three years of one soda per day is the energy equivalent of 263 kilograms of TNT. A soda per day for 170 thousand years is the energy equivalent of the 15KT Hiroshima...
by keithl
Wed Jan 18, 2017 7:07 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1787: "Voice Commands"
Replies: 54
Views: 10473

Re: 1787: "Voice Commands"

When I first looked at this forum page, there was no translation, so I found this webpage for translating Dvorak: http://wbic16.xedoloh.com/dvorak.html, and got the "ok google send a text" after translation. However, this is not properly secure. In the grand tradition of triple rot 13 , it...
by keithl
Wed Dec 21, 2016 11:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1775: "Things You Learn"
Replies: 47
Views: 8877

Re: 1775: Things You Learn

Cat bites are very dangerous vectors of infection, especially for cartoonists. If the cat that bit Randall had previously bitten Jeff Keane, Randall would be drawing Family Circus cartoons now, and we would all be screaming and clawing our eyes out. Fortunately, he received prompt professional care.
by keithl
Tue Nov 08, 2016 4:51 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1756: "I'm With Her"
Replies: 446
Views: 75162

Re: 1756: "I'm With Her"

Don't waste your vote!
Give it to the Republicans and Democrats to waste for you!
by keithl
Tue Nov 01, 2016 11:40 pm UTC
Forum: What If?
Topic: What-If 0152: "Flood Death Valley"
Replies: 43
Views: 17395

Re: What-If 0152: "Flood Death Valley"

I interpreted it (knowing that I wouldn't be quite right) as The Great Lord Randall, from context. But it's probably an ETLA that has been used in/inspired by the full text in Time or the 'secret' subforus, that I've not read. You're doing this on purpose, aren't you? Possibly, but that one's prett...
by keithl
Sat Oct 22, 2016 10:00 pm UTC
Forum: What If?
Topic: What-If 0152: "Flood Death Valley"
Replies: 43
Views: 17395

Re: What-If 0152: "Flood Death Valley"

Ah, right. Still, I don't think steam would bubble out of the surface of the ocean, for the same reason it already doesn't above thermal vents. (The pressure is too high for it to be gaseous, plus the water around it would carry away heat pretty effectively.) gmalivuk would be correct for a small h...
by keithl
Fri Oct 21, 2016 6:02 am UTC
Forum: What If?
Topic: What-If 0152: "Flood Death Valley"
Replies: 43
Views: 17395

Re: What-If 0152: "Flood Death Valley"

Oh, come now. You call that a What-If? The question was " ... could we dig a hole to the ocean ... ". Not a ditch, canal ... I guess TGLR was so distracted by temperature records that he neglected to answer the actual question. About a hole. Even a tunnel barely qualifies as a hole, and ce...
by keithl
Fri Sep 02, 2016 5:06 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1728: "Cron Mail"
Replies: 21
Views: 6667

Re: 1782: "Cron Mail"

Randall wants more efficient tools to manage cron output, and hopes to get useful suggestions from this forum. So do I. Sysadmin gurus, start explaining! Alt explanation 1: Since the "explainxkcd.com" page for this comic is also difficult to understand, Randall is hoping this comic will mo...
by keithl
Fri Aug 26, 2016 10:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1725: "Linear Regression"
Replies: 27
Views: 7140

Re: 1725: "Linear Regression"

Physicists are not immune, especially if they offset 3 sigma results with the logarithm of the megaeuros spent acquiring them, or of the hundreds of papers written about them. FYI, after six more months of intense data gathering, delaying data taking for other scheduled projects at LHC, the 750 GeV ...
by keithl
Mon Aug 22, 2016 6:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1723: "Meteorite Identification"
Replies: 30
Views: 7903

Re: 1723: "Meteorite Identification"

I've seen many meteors fall (I go camping during meteorite showers), but I've never found a meteorite. About a decade ago, I saw an extremely bright meteor east of Portland, Oregon, early in the morning on the way to the airport. Someone else at the airport had seen the same meteor a few miles up th...
by keithl
Mon Aug 15, 2016 5:22 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1720: "Horses"
Replies: 55
Views: 9249

Re: 1720: "Horses"

Absent-minded scientist Pierre Curie was killed by a horse-drawn carriage. Horseback riding cripples and kills more young people than heroin. Pro-tips: avoid science, and inject heroin before mounting a horse.
by keithl
Mon Aug 15, 2016 5:18 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1720: "Horses"
Replies: 55
Views: 9249

Re: 1720: "Horses"

And even if you've never witnessed it yourself, there was this guy named Disney who used to make these nature films....) Disney made fiction films, sometimes killing animals as props. . He helped exile American rocket scientists (Frank Molina and Qian Xuesen) while promoting former Nazis. Now his l...
by keithl
Wed Jul 27, 2016 10:25 pm UTC
Forum: What If?
Topic: What-If 0047: "Alien Astronomers"
Replies: 42
Views: 18768

Re: What-If 0047: "Alien Astronomers"

Two years later - will anyone read this? The most luminous emissions life makes are forest fires or large grassland fires, viewed on the night side of the Earth. The spectrum of the combustion products will be unique. With a large enough telescope to resolve a planet from the Sun's disk, anomalous b...
by keithl
Wed Jul 27, 2016 9:41 pm UTC
Forum: What If?
Topic: What-If 0151: "Sun Bug"
Replies: 43
Views: 14562

Re: What-If 0151: "Sun Bug"

To make a measly 3.84E26 W like our Sun, the hole would weigh 968 kilograms. The Schwarzschild radius of a 968 kg black hole is 10 -24 meters, which is millions of times smaller than a proton. In Niagara Straw , we saw what happens when you try to squeeze 3000 tonnes of water through a 3.8 x 10 -5 ...
by keithl
Tue Jul 26, 2016 12:01 am UTC
Forum: What If?
Topic: What-If 0151: "Sun Bug"
Replies: 43
Views: 14562

Re: What-If 0151: "Sun Bug"

Suggested AltWhatIf: Randall mentions an enormous firefly immediately collapsing into a black hole, but how about making a black hole as luminous as the Sun? How many fireflies would that take? Hawking radiation power is inversely proportional to the square of the mass: 3.562e32 W-kg 2 . To make a ...
by keithl
Wed Jul 06, 2016 5:59 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1703: "Juno"
Replies: 38
Views: 5692

Re: 1703: "Juno"

I'd be a bit curious about such a claim. How exactly do you define "arrive"? Jeez, doen u giys no nuttin? Juno "ariyvd" win she smakt intoo kristalin sfeer number 6, liyk wut Taw Limme sed. It wuz Jewlie 4, aftur dark. I herd duh bang owtsiyd, and der wuz a briyt liyt and sum la...
by keithl
Fri May 20, 2016 5:39 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1683: "Digital Data"
Replies: 122
Views: 18874

Re: 1683: "Digital Data"

We are very inaccurate digital copies of bacteria, and sooner or later, the raw material for making more.
by keithl
Mon Apr 25, 2016 5:24 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1672: "Women on 20s"
Replies: 218
Views: 32624

Re: 1672: "Women on 20s"

We should put pictures of body parts on US currency. That will encourage young people to go to medical school, and accumulate huge debt in order to work long hours for surprisingly low wages taking care of aging baby boomers like myself. We can replace the picture of Andrew Jackson with a hemorrhoid...
by keithl
Mon Apr 25, 2016 1:17 am UTC
Forum: What If?
Topic: What-If 0149: "Pizza Bird"
Replies: 57
Views: 16320

Re: What-If 0149: "Pizza Bird"

https://www.youtube.com/watch?v=u4xlYpKrCnU Fulton Surface-to-Air Recovery System FTW! Way cool - an airplane snagging a line lofted by a balloon! So why not a line lofted by a kettle of vultures? A column of Rüppell's vultures climb a thermal carrying a 10 km carbon nanotube filament, very light a...
by keithl
Fri Apr 15, 2016 3:43 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1668: "Singularity"
Replies: 26
Views: 6728

Re: 1668: "Singularity"

"OKAY, COOL. -- IM GONNA GO LOOK FOR A BOOK OR SOMETHING. ..." I've got a basement full of books. Mostly technical, lots of physics/chemistry/engineering handbooks. Some popsci, like an old Ray Kurzweil book predicting the singularity in 1995. A mathematics book about infinity, which expla...
by keithl
Thu Apr 07, 2016 1:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1664: "Mycology"
Replies: 47
Views: 7433

Re: 1664: Mycology

Some species may undergo Darwinian selection for scientific novelty and journal paper popularity. Species whose behavior results in highly cited papers lead to increased funding and more lab space devoted to the progeny of those lab organisms. We may think we are studying the behavior of lab animals...

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