Search found 711 matches

by scarecrovv
Mon Feb 22, 2016 2:10 am UTC
Forum: The Help Desk
Topic: What hosting do you all use?
Replies: 8
Views: 2961

Re: What hosting do you all use?

I quite like https://www.nearlyfreespeech.net/. It's not free, but it's inexpensive (pennies per month if your site is very low traffic like mine), transparent, and fair. I have never noticed any downtime (my site has always been there when I've visited, but it could have been down for weeks while I...
by scarecrovv
Fri Oct 09, 2015 4:25 pm UTC
Forum: Computer Science
Topic: Coding and Chronic Pain Combo
Replies: 7
Views: 4864

Re: Coding and Chronic Pain Combo

If you're talking about wrist pain from frequent keyboard use there are numerous alternative keyboard designs that might help.
by scarecrovv
Fri Sep 04, 2015 5:09 am UTC
Forum: Science
Topic: Caseless, nozzleless rocket
Replies: 6
Views: 1659

Re: Caseless, nozzleless rocket

It's an interesting idea, but I don't see any guidance system. This is going to be wildly inaccurate unless there is something I missed (I admit to not giving the patent more than a cursory glance).
by scarecrovv
Tue Jul 21, 2015 4:13 pm UTC
Forum: Religious Wars
Topic: Firefox vs. Chrome: Is it time for me to throw in the towel?
Replies: 41
Views: 21809

Firefox vs. Chrome: Is it time for me to throw in the towel?

Yesterday I was trying out an alpha version of an internal web page at the company where I work, which in a few months will be critical to how I do my job. I noticed that it didn't work in Firefox, but did work in Chrome. When I reported this as a bug I was thunderstruck by the response from the web...
by scarecrovv
Sun Jun 14, 2015 9:20 pm UTC
Forum: Computer Science
Topic: You gain an oracle turing machine.
Replies: 19
Views: 7695

Re: You gain an oracle turing machine.

Though the halting oracle is the most famous, you could come up with any oracle you like. Others include the random oracle which generates random numbers, and the matrioid oracle (not really understanding what a matroid is I can't elaborate, but wikipedia seems to think it's important). You could al...
by scarecrovv
Fri Jun 05, 2015 1:48 pm UTC
Forum: The Help Desk
Topic: Reading physical switch with computer
Replies: 2
Views: 2608

Re: Reading physical switch with computer

The two google search terms you want are usb and gpio . USB stands for Universal Serial Bus and your computer probably has several of those ports. GPIO stands for General Purpose Input/Output, and that's what you need to connect to a switch. Pretty much any of these products should turn the former i...
by scarecrovv
Sun May 24, 2015 4:10 pm UTC
Forum: Science
Topic: PhD study of this forum
Replies: 26
Views: 11273

Re: PhD study of this forum

What you're doing sounds interesting to me. I'm not sure if I sound interesting to you , but if I do I'd be happy to answer questions via PM. I'm a software engineer for an aerospace company who enjoys learning about science. Most of my older posts are from when I was an undergrad or master's studen...
by scarecrovv
Tue May 05, 2015 5:34 am UTC
Forum: Science
Topic: Getting Energy from the Moon's Extreme Temperatures
Replies: 11
Views: 1730

Re: Getting Energy from the Moon's Extreme Temperatures

You could put rails around the moon using a material that expands as its heats sufficiently to slowly push a giant object, and have that object drive a turbine. I doubt the slow rotational period of the moon would allow this to work. Sounds like someone's been reading 2312 . For those who haven't, ...
by scarecrovv
Fri May 01, 2015 3:25 pm UTC
Forum: Computer Science
Topic: A fun problem: Biggest difference between elements
Replies: 9
Views: 4168

Re: A fun problem: Biggest difference between elements

If I understand your algorithm correctly, it fails with the inputs {1, 10, 18, 26} and {1, 12, 22, 23, 25} (or any rearrangements thereof). The largest difference may include one fewer empty bin than the longest run. Fortunately, the algorithm still runs in O(n) time after accounting for th...
by scarecrovv
Fri May 01, 2015 6:09 am UTC
Forum: Computer Science
Topic: A fun problem: Biggest difference between elements
Replies: 9
Views: 4168

Re: A fun problem: Biggest difference between elements

This might be excessively complicated, but it works. If you sort n items into n+1 bins then at least one bin is guaranteed to be empty. Since there is at least one empty bin then you know that the longest interval must be at least as long as a bin, and you can therefore just find runs of consecutive...
by scarecrovv
Sun Apr 12, 2015 9:35 am UTC
Forum: Science
Topic: Earth's trajectory if the sun disappeared...?
Replies: 48
Views: 6013

Re: Earth's trajectory if the sun disappeared...?

At this point, the speed of Earth relative to Jupiter will be 20.61 km/s. At that speed, it will be captured by Jupiter's gravity if it comes within 596,109 km of the gas giant. So Earth has a window of about 1.2 million kilometers; if it hits that window, Jupiter will capture it; if not, it will e...
by scarecrovv
Mon Mar 30, 2015 7:33 am UTC
Forum: Science
Topic: Extension cord question. Is Jimmy right?
Replies: 21
Views: 3443

Re: Extension cord question. Is Jimmy right?

I just measured the capacitance of a 6 foot computer power cable at 0.23nF. If we assume that an extension cord has similar properties, a 100ft cord might have a capacitance of about 3.8nF. Perhaps it would be measurable, but probably not significant.
by scarecrovv
Mon Mar 30, 2015 2:34 am UTC
Forum: Science
Topic: Extension cord question. Is Jimmy right?
Replies: 21
Views: 3443

Re: Extension cord question. Is Jimmy right?

Perhaps I’m not thinking this through clearly, but does it make a difference that the current is AC rather than DC? As in, whichever cord is proximal to the outlet will experience a greater voltage fluctuation, whereas the distal cord will see the maximal voltage already somewhat reduced. I would t...
by scarecrovv
Mon Mar 30, 2015 12:19 am UTC
Forum: Science
Topic: Extension cord question. Is Jimmy right?
Replies: 21
Views: 3443

Re: Extension cord question. Is Jimmy right?

Jimmy is wrong, FancyHat is right. I just want to boil down FancyHat's answer a little with a crude diagram: cords.png Jimmy's mistake is that he's thinking about V_big. However, V_small1 and V_small2 are what control the power dissipation in the cord, and those voltages are entirely determined by t...
by scarecrovv
Sun Mar 22, 2015 7:46 am UTC
Forum: Fictional Science
Topic: Super-Powers (Super-Speed!)
Replies: 73
Views: 11546

Re: Super-Powers (Super-Speed!)

Let's do some math with an eye on the possibility of super-strength as a side effect of time dilation. Suppose that at normal speed he walks up to a 100000kg train locomotive and places his hand on it. He then dilates time by a factor of 100000, and gives it a push. If he pushes with a force of 10N ...
by scarecrovv
Wed Mar 11, 2015 4:36 am UTC
Forum: Fictional Science
Topic: Hand-held space-jet
Replies: 19
Views: 5854

Re: Hand-held space-jet

But isn't that much harder to guide? I'm not thinking of opposing jets - more like: /\ (and two more at right angles - they only have to be angled enough to not wash over you). If the force is behind you, aren't you going to be a lot more unstable? It's a common misconception that having your rocke...
by scarecrovv
Sat Mar 07, 2015 9:18 pm UTC
Forum: Forum Games
Topic: Read once quickly, then remember and reproduce
Replies: 991
Views: 134434

Re: Read once quickly, then remember and reproduce

Spoiler:
Coincidentally, I stole half of the Korean man's DNA. I should not have done so, for half of it was his father's.
by scarecrovv
Sat Mar 07, 2015 9:02 pm UTC
Forum: Forum Games
Topic: Can you produce [X] in less than 15 seconds?
Replies: 6658
Views: 396048

Re: Can you produce [X] in less than 15 seconds?

A box containing a chair I bought from Ikea last year and still haven't gotten around to assembling.

A Mousetrap?
by scarecrovv
Sun Feb 22, 2015 5:47 am UTC
Forum: Science
Topic: Oxidisers
Replies: 30
Views: 4515

Re: Oxidisers

Ignition by John D. Clark is an excellent book about the development of liquid rocket propellants. Most propellants are a combination of a fuel and an oxidizer. Many oxidizers are mentioned in the book. Two that I recall coming up often that aren't in the thread already are nitrogen tetroxide (N 2 ...
by scarecrovv
Sat Feb 21, 2015 10:21 pm UTC
Forum: General
Topic: What are your "core" programs?
Replies: 55
Views: 10237

Re: What are your "core" programs?

Starting fresh with Arch Linux, here are a few things I can recall. Desktopy stuff: X11 xmonad, xmonad-contrib, and whatever other cabal packages are needed to get my custom xmonad.hs file working. xmobar fbpanel dmenu nm-applet Software developery stuff: vim git git-annex ghc / cabal Python gcc / g...
by scarecrovv
Sun Feb 15, 2015 7:50 pm UTC
Forum: Computer Science
Topic: md5(x) = x [and other properties of md5]
Replies: 39
Views: 22386

Re: md5(x) = x [and other properties of md5]

PeteP wrote:Why do you have a list with 1 million md5 strings?

Exactly my question. It bears a strong resemblance to asking "what's the best way to dispose of a body?". Even if I had a way to invert md5 I wouldn't want to help someone who has just stolen someone else's password database.
by scarecrovv
Tue Feb 10, 2015 5:50 am UTC
Forum: General
Topic: Confidence and Poise in Job Interviews
Replies: 13
Views: 1839

Re: Confidence and Poise in Job Interviews

So many people come to an interview in a suit they've never worn, that doesn't fit and who clearly took six tries to tie their tie before they gave up. That will fuck you over mentally from the get go. Fixing this one takes work, and social work. Uncomfortable work. But it's worth it: Wear your sui...
by scarecrovv
Mon Jan 19, 2015 12:57 am UTC
Forum: News & Articles
Topic: Welcome to Kentucky
Replies: 98
Views: 11293

Re: Welcome to Kentucky

In my dorm in college all the bathrooms were unisex. It was weird, exciting, and interesting for about 20 seconds, and after that it seemed perfectly normal. The building was arranged this way because back in Ye Olden Days it was an all male dorm. When they desegregated the dorm, they didn't bother ...
by scarecrovv
Wed Jan 14, 2015 8:03 am UTC
Forum: Religious Wars
Topic: Is 0 a natural number?
Replies: 35
Views: 10905

Re: Is 0 a natural number?

Thesh wrote:
Sizik wrote:I say yes, because we already have a name the set {1, 2, 3, ...}, which is "positive number".


Strange, I always thought 0.1 was a positive number.

Pedants can say "positive integers".
by scarecrovv
Wed Jan 07, 2015 5:38 pm UTC
Forum: Religious Wars
Topic: Best keyboard switch?
Replies: 43
Views: 11970

Re: Best keyboard switch?

Maybe it makes me a heretic, but I went with scissor switches because I learned to code on laptops and got used to it. Now by comparison normal desktop keyboards have: ⋅ An excessively long key travel length ⋅ An excessively high actuation force ⋅ An excessively tall he...
by scarecrovv
Wed Dec 17, 2014 8:56 am UTC
Forum: Computer Science
Topic: how to communicate under heavy targeted surveillance
Replies: 13
Views: 6209

Re: how to communicate under heavy targeted surveillance

You may be interested in the Solitaire Cipher . There are no electronics involved at all, and while it is slow, it is pretty secure for short messages. A completely shuffled deck of cards with jokers is a 237 bit key - not huge, but pretty good. The primary difficulty is exchanging keys and keeping ...
by scarecrovv
Tue Dec 02, 2014 2:26 am UTC
Forum: Science
Topic: What's the maximum lifetime of a candle wick?
Replies: 2
Views: 1699

Re: What's the maximum lifetime of a candle wick?

Also, though it's not exactly the same thing, you may be interested in reading about the analogous structure in propane or other gas lamps, the mantle . As far as I know, it was the last major innovation in flame based light before electricity took over. It's basically a specially treated cloth mesh...
by scarecrovv
Mon Dec 01, 2014 3:22 am UTC
Forum: General
Topic: What are these weird doodads on lamp posts? (photos)
Replies: 6
Views: 2539

Re: What are these weird doodads on lamp posts? (photos)

We also considered that they might be mechanical dampers, but they didn't seem big enough. You're probably right though, and while the wikipedia article only mentions their use on cables, this google books search result does say they're used on lamp posts. Thanks!
by scarecrovv
Mon Dec 01, 2014 2:29 am UTC
Forum: General
Topic: What are these weird doodads on lamp posts? (photos)
Replies: 6
Views: 2539

What are these weird doodads on lamp posts? (photos)

A group of us were driving out of Boston on the southeast expressway when we noticed these weird doodads on lampposts. I later went back and found pictures of them on google street view, but googling "street lamp doodad" doesn't turn up any helpful results. Can you help us identify these t...
by scarecrovv
Mon Dec 01, 2014 1:11 am UTC
Forum: Computer Science
Topic: You gain an oracle turing machine.
Replies: 19
Views: 7695

Re: You gain an oracle turing machine.

It depends on the type of oracle the machine includes. I suspect you mean a halting oracle though, which can solve the halting problem for any normal Turing machine in a short constant time. If I had a halting oracle the only safe course of action would be to destroy it, after solving a handful of m...
by scarecrovv
Thu Oct 30, 2014 5:16 pm UTC
Forum: News & Articles
Topic: Orbital's third mission to the ISS ends with a kaboom
Replies: 21
Views: 4280

Re: Orbital's third mission to the ISS ends with a kaboom

Additional speculation floating around the internet: Moments before the explosion, it looks like the engine plume got much brighter and yellower. This apparently indicates a fuel rich mixture in the engine, which could indicate a blockage in the oxygen supply (possibly due to FOD - Foreign Object De...
by scarecrovv
Wed Oct 29, 2014 6:36 am UTC
Forum: News & Articles
Topic: Orbital's third mission to the ISS ends with a kaboom
Replies: 21
Views: 4280

Orbital's third mission to the ISS ends with a kaboom

http://www.nasaspaceflight.com/2014/10/antares-fails-shortly-after-launch/ Orbital’s Antares fails seconds after launch October 28, 2014 by William Graham and Chris Bergin Orbital’s Antares launch vehicle – tasked with lofting the CRS-3 Cygnus to the International Space Station (ISS) – dram...
by scarecrovv
Tue Oct 14, 2014 6:09 am UTC
Forum: Coding
Topic: Funniest/Most Annoying Code Comments
Replies: 662
Views: 113354

Re: Funniest/Most Annoying Code Comments

Today I saw this:

Code: Select all

#define private public

This was annotated with two comments, one a severe reprimand, and the other an apology.
by scarecrovv
Fri Oct 10, 2014 4:04 pm UTC
Forum: Science
Topic: Let's terraform Jupiter!
Replies: 26
Views: 6475

Re: Let's terraform Jupiter!

genetically engineered microorganisms which convert the hydrogen into biomass On the composition of Jupiter: the atmosphere is approximately 75% hydrogen and 24% helium by mass, with the remaining one percent of the mass consisting of other elements. On the composition of the human body, which can ...
by scarecrovv
Wed Oct 08, 2014 7:07 am UTC
Forum: The Help Desk
Topic: Problem with OpenGL
Replies: 2
Views: 2212

Re: Problem with OpenGL

I took a quick glance, but didn't see anything glaring. If you want to help us help you (and perhaps help yourself in the process) try writing the smallest program you can that demonstrates the problem, preferably <100 lines. It will be much easier for us, and possibly you, to see what's wrong if th...
by scarecrovv
Thu Sep 25, 2014 7:08 am UTC
Forum: School
Topic: Graduating write-up
Replies: 4
Views: 5645

Re: Graduating write-up

Reading that page, I quite liked this one, and any yearbook committee would see fit to print it:
The wonderful thing about science is that it doesn't ask for your faith, it just asks for your eyes.
by scarecrovv
Mon Sep 22, 2014 5:59 pm UTC
Forum: Science
Topic: [Mech eng.] Feasibility of an omnidirectional wheelchair?
Replies: 28
Views: 4603

Re: [Mech eng.] Feasibility of an omnidirectional wheelchair

Do Mecanum wheels really fit the original question's requirement that it should be possible to manually push the wheelchair in any desired direction if the power runs out, though? How would you get all the rollers spinning at the right rate with your hands? I think that if you open-circuit the moto...
by scarecrovv
Wed Aug 27, 2014 5:39 am UTC
Forum: Science
Topic: How hard would I punch something to shatter the moon?
Replies: 7
Views: 2488

Re: How hard would I punch something to shatter the moon?

It wouldn't be possible to punch something so hard that the shockwave would shatter the moon, because there isn't enough matter for the shockwave to travel though between here and there. You could (for some value of "could") punch something hard enough that you send debris to the moon, whi...
by scarecrovv
Sun Aug 24, 2014 7:08 pm UTC
Forum: News & Articles
Topic: The Darker Side of the News
Replies: 2503
Views: 259693

Re: The Darker Side of the News

Indeed. Writing stories about hunting dinosaurs is hardly threatening. When I was that age I said and wrote things far more call-the-police-worthy than that, but I was never a danger and I turned out fine. A sequel to Jurassic Park is not a threat, implied or otherwise. This is a clear case of ass-c...
by scarecrovv
Fri Aug 22, 2014 4:59 pm UTC
Forum: Mathematics
Topic: Is this a sequence?
Replies: 2
Views: 1633

Re: Is this a sequence?

Upon what basis did you choose -2 and -9? If you just picked completely at random, it's highly probable that the presenter is just making stuff up.

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