#qi-hardware IRC log for Monday, 2014-05-26

DocScrutinizer05but soab and hydrocarbon tends to act funny00:00
whitequarkesbit... is it the same thing called "solid alcohol" here?00:00
whitequarkI don't quite remember what is it composed of, but surely not alcohol or soap00:00
whitequarkI know you can make hexagen out of it00:00
whitequarka guy I know once cooked RDX out of hexamine right at his kitchen. It burned up pretty impressively00:02
whitequarkright! "Dry alcohol" is literally how it's called in RU00:03
whitequarkimported term from East Germany?00:03
DocScrutinizer05anyway Esbit is prolly a red herring here, rather search for soap and terpentine for example00:04
whitequarkone of first links in Google by that query: "Topic: Turpentine - Page 1, Enemas specially for sexual pleasure..."00:05
DocScrutinizer05soap molecule has a water end and a err fat end00:05
DocScrutinizer05the hydrocarbon reacts with the fat end00:05
whitequarkDocScrutinizer05: polar and nonpolar end is how it's called in English afaik00:05
DocScrutinizer05dunno about ethanol00:05
whitequarkand yeah, I know how surfactants work :p00:05
whitequarkapparently soap and alcohol are explicitly mixed to make transparent soap00:08
DocScrutinizer05yeah, sounds like one of the weird unexpected effects I referred to00:09
whitequarkthough it's also has glycerin and is heated there, which prolly leads to some reaction, unsure which00:09
whitequarkwithout heating nothing would happen I think00:09
whitequarkthere's also sugar...00:09
DocScrutinizer05oh yeah, sugar, the unknown alcohol00:10
DocScrutinizer05(sorry, never been too bright in chemistry)00:11
whitequarkDocScrutinizer05: remember that weird gif? that weird pattern is actually a fractal00:13
whitequarkyou could zoom in into it forever00:13
DocScrutinizer05actually sweetening your cooling water might also have some interesting effect on the quality of the cut00:13
whitequarkyes, and it would also make everything sticky, and attract tons of flies00:13
DocScrutinizer05hehehe, definitely00:14
whitequarkthe evening of abridged advice at #qi-hw00:14
DocScrutinizer05though pure sugar is odorless and thus doesn't attract flies00:14
whitequarkokay, wasps00:14
whitequarkthey seem to communicate the presence of sugar or something00:14
whitequarkalthough I haven't seen any in moscow for a long time00:15
DocScrutinizer05yes, definitely. Like bees. But they also need to "find" the sugar or smell something "sweet"00:15
DocScrutinizer05and wasps are even more interested in meat than in sugar00:16
DocScrutinizer05ok, they love cake as well00:17
DocScrutinizer05definitely I never seen them eating pure sugar, even when available00:17
DocScrutinizer05fruits yes00:18
whitequarkI have, they love watermelons to the point of drowning in them in thousands00:18
whitequarkand it's basically pure sugar00:18
whitequark<pedantic>watermelons aren't fruits, they're berries</pedantic>00:18
DocScrutinizer05it's not, it has lots of aroma and water00:18
whitequarkoh, you mean like sugar blocks. definitely.00:18
DocScrutinizer05I guess wasps have no "saliva" to even notice that white crystal is sugar00:19
DocScrutinizer05for them it's prolly looking and smeling just like sand00:20
whitequarklooking? well... most insects don't rely on sight anyway00:21
DocScrutinizer05surprisingly few animals seem to be interested in sugar00:21
whitequarkand those who do have such a wide range they could probably work like tiny spectrometer analysis stations00:21
DocScrutinizer05pure sugar00:21
whitequarkpure sugar doesn't appear in nature, does it?00:21
DocScrutinizer05it's synthetic00:22
whitequarkso then there's no evolutionary pressure00:22
DocScrutinizer05once I worked in a caffe. A mouse - during the night - pierced a roundabout 100 of those 10g coffemilk plastic cups with alu lid. The mouse didn't touch the sugar bags nearby00:23
DocScrutinizer05but it ate 4 snickers. Not completely of course00:25
whitequarkthat would be one huge mouse00:26
DocScrutinizer05hehe, indeed00:26
whitequarknot even a big rat would probably manage that00:26
DocScrutinizer05it must have been too fat to walk even after the volume it ate out of those 4. I guess the mouse must have weighed double after meal00:27
Action: whitequark recalls dissection of some animals, including rats, in uni00:27
whitequarkreally, the most remarkable thing about the rat is the size of its balls. they're truly enormous. slightly bigger, and they'd be bigger than mine, and I don't mean scaled up wrt/ body size00:28
whitequarkone of the things I best remember from the uni00:28
whitequarkI've asked the professor. apparently, the male rat lives to screw, and for that it needs quite a factory of gametes00:30
Action: DocScrutinizer05 idly glares at a Huawai(?) Q101 3G USB stick00:30
DocScrutinizer05or that, or not00:31
DocScrutinizer05from TPE00:31
DocScrutinizer05got it together with a eeePC I bought there00:31
DocScrutinizer05was an offer on top of the SIM contract I got me. 100EUR or somesuch, for both00:32
DocScrutinizer05it's the size of a lipstick, a huge one00:33
whitequarkyeah they usually are00:33
DocScrutinizer05(snickers) I heard several times now that bait for mousetrap best is peanutbutter00:43
DocScrutinizer05whitequark: new c't-Hacks has some nice tesla transformers :-)01:01
DocScrutinizer05one with transformer, capacitors and spark gap. One with electron valve \o/.  And I think one with mosfets?01:02
wpwrak(vodka as coolant, plus bubbles) can't wait for the selfies ;-)01:59
wpwrak(adding sugar) the alcohol will kill the flies ...02:03
rohwpwrak: the reason we do not use alcohol is smoking needs to be forbidden in the vicinity of the machine then...02:30
Action: wpwrak wonders whether Josephine Cochrane, inventor of the dishwasher, ever got a prize for extraordinary achievements for humanity02:30
rohalso.. if it would be vodka we would have problems due to people drinking the machines stash02:30
wpwrakin russia, neither should be much of an issue :)02:30
DocScrutinizer05I still wonder how a freshly booted system (a few days old) could eat 8GB of RAM, and how processes may have 2, 3 or even 4GB of virtual size :-S  http://wstaw.org/m/2014/05/26/plasma-desktopSQ1787.png03:10
wpwrakefficient programming :)06:24
whitequarkDocScrutinizer05: (virtual size) it's very simple, and in fact it actually *is* efficient programming06:27
whitequarkVSZ grows if a process requests the OS to mmap large files06:27
whitequarkon 64bit mmapping large files is the best way to randomly access them, because you get the OS manage the memory for you--for example, it will read the data directly into the allocated pages without any copying, and evict the pages in low (physical) memory conditions, again without the app having to do anything06:28
whitequarkSublime Text mmaps hundreds of GB, even06:29
whitequarkthe page tables and kernel structures consume some amount of physical memory, but it's comparatively miniscule06:29
whitequarkDocScrutinizer05: otoh I really don't know what's wrong with kdeinit on your system. On mine it consumes 21M of RSS06:30
nicksydneywhat's up people ?!11:50
nicksydneypyra competitor but much cheaper http://www.instructables.com/id/How-to-Make-a-Portable-Game-System/?ALLSTEPS  :)11:53
DocScrutinizer05sorry, that's ridiculous but not a "competitor to pyra"12:30
whitequarkhmm, got some polishing paste, chromium oxide based15:25
whitequarkalso made the lens bi-convex by gluing the parts with epoxy15:26
DocScrutinizer05pyra is a general purpose palmtop computer optimized for, and running, Linux as OS. It comes with some minor "compromises" regarding HID design to make it more suited for playing games on it (D-pad, ABCD buttons, dunno what else)16:23
wpwrakwhitequark: now you can make your own geek glasses ;-)16:27
whitequarkwpwrak: yeah, thought about it16:27
whitequarkjudging by the ones I have, it'd be really hard to properly create the geometry16:28
pcercueilarsc: hey, do you have a pump for tires?20:25
whitequarkI made that lens! http://imgur.com/a/3PZai20:27
whitequarkeven took a picture through it with my camera. a miracle it focused on *anything*20:27
wpwraknow you can make a google glass clone with your own lenses ;-)20:33
whitequarka small step for a man, a big step for creepy open-source hardware?20:34
wpwrakhint: opencreep.org is still available ;)20:40
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