Search found 598 matches

by keithl
Fri Jul 28, 2017 6:26 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1868: "Eclipse Flights"
Replies: 31
Views: 2639

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: 2639

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: 12435

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: 14125

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: 7189

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: 8516

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: 14294

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: 8710

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: 7175

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: 62379

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: 42
Views: 13966

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: 42
Views: 13966

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: 42
Views: 13966

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: 6092

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: 6280

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: 7040

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: 7675

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: 7675

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: 16529

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: 11984

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: 11984

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: 5108

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: 16522

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: 29318

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: 13908

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: 5921

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: 6404

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...
by keithl
Sat Apr 02, 2016 1:19 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1663: "Garden"
Replies: 671
Views: 106227

Re: 1663: ???

Gammarad wrote:Now it says:

Image

Code: Select all

> cal 4 2017
     April 2017     
Su Mo Tu We Th Fr Sa
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 2  3  4  5  6  7  8
 9 10 11 12 13 14 15
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by keithl
Thu Mar 24, 2016 3:12 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1659: Tire Swing
Replies: 11
Views: 2769

Re: 1659: Tire Swing

But if we find a practical (or even impractical) use for those old tires, what will our local mosquito population do for a breeding area? ... Fear not! The cavity at the bottom of the hanging tire can still hold plenty of water, perhaps more than the tire lying on its side in a junk yard, certainly...
by keithl
Wed Mar 23, 2016 9:25 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1659: Tire Swing
Replies: 11
Views: 2769

Re: 1659: Tire Swing

So, did they take the tree and the rope from other guys, too, or did they take a guy off the hanging rope?
by keithl
Wed Mar 16, 2016 7:10 pm UTC
Forum: What If?
Topic: What-If 0148: "Eat the Sun"
Replies: 40
Views: 14263

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

This gets a lot more interesting if "we" is properly redefined. Biohuman brains die, and are suboptimum for long term survival. We will soon add external enhancements and high bandwidth connections to biobrains, and before long "we" will become those enhancements, avoiding pesky ...
by keithl
Tue Mar 15, 2016 6:56 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1655: "Doomsday Clock"
Replies: 63
Views: 9236

Re: 1655: "Doomsday Clock"

DST - there will be a ballot initiative here in Oregon to get rid of it by 2018. The best reason is that Oregon's foreign trading partners are mostly in east Asia. China, India, Indonesia, Japan, South Korea ... all use standard time, all year. In fact, all of China is one time zone, spanning 61 deg...
by keithl
Thu Feb 25, 2016 9:16 pm UTC
Forum: What If?
Topic: What-If 0146: "Stop Jupiter"
Replies: 60
Views: 14086

Re: What-If 0146: "Stop Jupiter"

What if we tried more planets? This will take gigayears and ludicrously precise measurements to arrange. Stopping Jupiter requires a lot of mass, and there is not nearly enough mass in the solar system and Oort cloud to do it. However, there are a lot of dwarf planets out there, moseying between the...
by keithl
Thu Feb 11, 2016 8:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1641: "Hot Dogs"
Replies: 49
Views: 8080

Re: 1641: "Hot Dogs"

It could be worse -- what if hot dogs came in packages of 10 but hot dog buns came in packages of 4*π ? Then you could never buy enough packages to match all hot dogs to a bun. The new packaging concept will be continuous hot dog and continuous bun wrapped around spools. 4*π of bun (or hot dog) is ...
by keithl
Wed Jan 27, 2016 8:41 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1635: "Birdsong"
Replies: 40
Views: 7255

Re: 1635: "Birdsong"

Notes do not have 180° rotational symmetry! The cartoon bird is flying back and forth, perhaps inverted above the frame, so some of the cartoon notes may appear rotated or flipped in two dimensional cartoon space. Solid notes lingering in cartoon air are an evolved protective response for cartoon b...
by keithl
Sat Jan 23, 2016 7:51 pm UTC
Forum: What If?
Topic: What-If 0141: "Sunbeam"
Replies: 81
Views: 20019

Re: What-If 0141: "Sunbeam"

And another question, when building a Dyson Sphere/Swarm with mirrors, aren't we already focussing the light from the star in the building progress? Every unit (mirror) that gets put in it's position blocks the light from going straight outwards to back to the star or another direction. ... Really,...
by keithl
Sat Jan 23, 2016 11:05 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1633: "Possible Undiscovered Planets"
Replies: 104
Views: 13858

Re: 1633: "Possible undiscovered planets"

The Large Synoptic Survey Telescope will push the boundary of "stuff we can see with telescopes" to the right about an order of magnitude, after science operations begin in 2022. LSST will not see as far as some of the largest telescopes, but it will digitally image the entire southern sky...
by keithl
Thu Dec 31, 2015 7:30 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1623: "2016 Conversation Guide"
Replies: 94
Views: 15795

Re: 1623: "2016 Conversation Guide"

The " Magic Roundabout "? Double ugh. The Swindon magic roundabout? That one's nothing. The Hemel Hempstead one, now that one makes life interesting. Only six legs? With visibility? That's a walk in the park. I invite you to try Church Circle in Annapolis MD , which is narrow, with eight ...
by keithl
Wed Dec 30, 2015 7:36 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1623: "2016 Conversation Guide"
Replies: 94
Views: 15795

Re: 1632: "2016 Conversation Guide"

Self-driving cars coming soon: no. Read David A. Mindell's recent "Our Robots, Ourselves". Mindell has worked on semiautonomous ocean exploration robots since the beginning, and is also a private pilot with considerable "electronic cockpit" experience. In spite of the ignorant pr...
by keithl
Mon Dec 21, 2015 8:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1619: Watson Medical Algorithm
Replies: 55
Views: 10964

Re: 1619: Watson Medical Algorithm

It's uncanny - this is precisely the procedure described in the upcoming 20th edition of "Harrison's Principles of Internal Medicine", the standard reference for clinical practice. I just downloaded the galleys from McGraw Hill's experimental new document management system, also from IBM r...

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