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Anonymous 13/04/16(Tue)21:23 No. 14922 ID: b20a90 [Reply]
14922

File 13661402206.gif - (7.84KB , 490x606 , Toilet.gif )

Dear /sci/!

I've heard about a flush tank mechanism that doesn't have moving parts. You flush by pressing a bulb that upsets some kind of equilibrium between air and water in a series of pipes. And when the tank is refilled, the equilibrium is created anew.

Does anyone please know what I'm talking about?


>>
Anonymous 13/04/19(Fri)02:10 No. 14934 ID: 0e78b5

Sounds like it basically kickstarts a syphon effect that drains all the water out... which is exactly the same method by which a normal toilet works, just you're providing the initial pressure to raise that first bit of water by squeezing a bulb rather than pushing a handle/button/pulling a chain to raise a plunger.

Not really sure what the advantage is. The mechanical form does gradually wear out over time, but unless you're on a spaceship or desert island it's no big deal (not that you'd probably have a flush toilet in either case), and the rubber bulb will itself eventually perish.




Anonymous 13/03/28(Thu)13:35 No. 14859 ID: cb9fa8 [Reply]
14859

File 136447411834.jpg - (2.25MB , 2576x2128 , Shipping-Routes-Map.jpg )

Can hackers exist without the world wide web?

Can an internet of things exist without hackers?


2 posts omitted. Click Reply to view.
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Anonymous 13/03/31(Sun)00:31 No. 14880 ID: 470824

I think that the publicity of the internet and the overall profitability of hacking has contributed greatly to the increase in the number of hackers, but even with no motive except curiosity there would still be the odd few. Phreaking is pretty much nonexistent now because of the drop in the price of phone service and long distance calls.


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Anonymous 13/04/18(Thu)14:15 No. 14926 ID: 6d421a

Hacker originally refers to someone that can pick locks.


>>
Anonymous 13/04/19(Fri)01:55 No. 14932 ID: 0e78b5

Hackers/crackers as we would know them predate the "world wide web" by the better part of 15 years, from about as early as affordable home computers with attachable modems existed - the heady days of Altairs and 300 baud acoustic couplers, as indeed seen in the early 80s film "Wargames" (the kit being used by the protagonist is distinctly 1970s).

The WWW didn't arrive until 1990, and public internet access - up until that point just for email, usenet, FTP etc and generally achieved by dialling into a BBS-like service that also had an oh-so-precious (and often not even real-time) internet hookup - only really arrived in the early 80s (email was around before then, but not in the form we would recognise, and not really accessible outside of educational, scientific and military/governmental institutes) and took a while to take off.

The earliest version of the infamous "anarchists cookbook", which detailed plentiful tales of computer and rather more analogue shenanigans (phone system hacking, credit card fraud, homemade bombs, lock picking, epic pranks etc), both up-to-date (at the time) and "of yore" (reaching back into the 70s and even 1960s when long-distance, off-the-record phone connections were far more valuable things to "steal", and everyone knew the story of the guy who managed to accidentally 2600-dial the white house war room), was mainly typed up on Apple IIs, TRS-80s and other such deeply vintage machines, and passed around on olde time low-speed BBSes and floppy disks (don't underestimate the bandwidth of an envelope full of 5 1/4" floppies when your only data line runs at all of 30cps), the 3 1/2" DSDD (Atari, Amiga AND IBM compatible) version of which was my own first contact.

And, heck, even if we don't have Wargames to look at ... just go watch Scanners.

So to answer the first question: very, VERY yes.

Your second one: theoretically yes. Practically? No chance. Remove the human element, and any AI that hasn't been carefully constructed to be completely benevolent/passive and without any learning/self modifying functions other than error detection and repair, and you might be in with a sniff. You can try locking it down with an iron fist, and that will just strengthen any human or independently-operating AI's resolve to break the shackles you've put them in. If there's one thing a hacker can't resist, it's a challenge.
(Again - go watch Hackers...)

And if we go back to the old definitions...

Message too long. Click here to view the full text.




OP!ffs9FusbQY 12/09/18(Tue)02:55 No. 14203 ID: f9ca29 [Reply]
14203

File 134792973257.jpg - (38.53KB , 600x453 , galaxy-s-3.jpg )

So I'm getting the Samsung Galaxy S3 in the next couple of days and I'm excited. What are some apps you guys would definitely recommend from the google playstore? They can be games or just entertainments/tweaks, doesnt matter.

For example, Im going to finally be able to get some good chan apps, like 4chant etc.
Fuck iOS, done with that shit


4 posts omitted. Click Reply to view.
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Anonymous 12/11/20(Tue)17:44 No. 14446 ID: f71399

>>14393
Solid explorer is better


>>
Anonymous 13/04/11(Thu)16:40 No. 14915 ID: 096e87

Zedge (Free ringtones and wallpaper), Music Download Paradise(obvious), Adownloader and/ or Adownloader new(Pirate Bay and uTorrent), with Adownloader you can get GBA roms and you can play those with My Boy Free. and Vector is just a fun little game.


>>
Anonymous 13/04/18(Thu)01:17 No. 14924 ID: 4a0ae5

There's a really good fps style dungeon crawler i got direct from the dev for $5 called delver and you get windows and osx versions as well as the android apk. It randomly generates a new dungeon each time you play. Graphics-wise it looks kinda like minecraft.

As for apps, if you want to be able to remote into your pc get a free logmein account and download the free version of the app. I also use brightest flashlight to use the camera as a flashlight, and thinkfree office lets you create and edit ms office generated files like excel and word stuff, good for organizing your shit. Also suggesting everything else already suggested especially es file explorer.


You also may want to look into rooting it so you can generate a hotspot if you take a laptop or tablet with you so you arent paying through your carrier for internet twice.




Why do women find broad shoulders and narrow waist attractive? Anonymous 13/04/17(Wed)23:55 No. 14923 ID: bb81dc [Reply]
14923

File 136623571245.jpg - (21.07KB , 240x320 , michael_phelps3.jpg )

Here's an article about a study on what kind of physical attributes women find attractive in men: http://www.economist.com/news/science-and-technology/21576061-womens-expectations-opposite-sex-are-least-unrealistic

Apparently, shoulder-to-waist ratio is by far the most strongly correlating factor to attractiveness easily - at least when only the body, not including head or face is taken into account. The broader the shoulders and narrower the waist, the better. It seems to be practically impossible to have too wide shoulders and too narrow a waist.

Now, why might this be? Can it be explained by evolutionary reasoning? If so, why has favoring men with a high shoulders/waist ratio been helpful with bringing up successful offspring? It doesn't mean more strength, because the strength of muscles is directly proportional to their circumference, not to their length, and it seems to me - correct me if I'm wrong - that wider shoulders add only to lengths of some muscles, not width.

Could it perhaps be that wide shoulders help with throwing rocks and spears, since they might be able to generate higher speeds & kinetic energies for the thrown objects, assuming the angular speed at which the shoulder line rotates when throwing is the same? Swinging around a melee weapon or one's fists could be similarly affected. These wouldn't explain narrow waist though.

Or maybe a high shoulder/waist ratio could simply be the best and most easily measured indicator for high testosterone and low estrogen? Or maybe there isn't a simple evolutionary explanation and the preference is rather formed by cultural influence? Men depicted in classical art seem to usually have a fairly small shoulder/waist ratio. But then again, there used to not be many women artists.

Picture related, this guy has a bone structure with relatively wide shoulders and a narrow waist.




Anonymous 13/04/14(Sun)05:37 No. 14918 ID: 3afe94 [Reply]
14918

File 136591062454.jpg - (4.72KB , 220x289 , 220px-Luminol2006[1].jpg )

Hey /sci/, I've got a couple questions about luminol.
First, what are the effects of ingesting luminol?
Can it ever be deadly?
Is it at all flammable?


>>
Anonymous 13/04/14(Sun)07:06 No. 14919 ID: 4ccccc

Considering that the MSDS sheet says that luminol is a strong irritant to regular skin, I'd think that ingesting it would be agonizing and potentially deadly. It's combustible at high temperatures; the degree is not specified.

tl;dr...google




Petitioning United States Government and Congress on Telecommunications Anonymous 13/04/12(Fri)09:00 No. 14916 ID: e27fdf [Reply]
14916

File 136575003571.jpg - (50.24KB , 950x350 , 950_1-small.jpg )

http://www.change.org/petitions/united-states-government-and-congress-on-telecommunications-infrastructure-improve-socioeconomical-and-infrastructural-problems-effecting-americans




Anonymous 13/04/02(Tue)02:56 No. 14886 ID: 2b9b73 [Reply]
14886

File 136486417764.jpg - (169.47KB , 1907x1050 , Clipboard02.jpg )

>Advanced Electronics Cooling Technology: GE's Dual Piezoelectric Cooling Jets (DCJ)
http://www.youtube.com/watch?v=Hm5fXj-hUpk

I don't get it, why can't buy this yet? Why can't I find any news about it AT ALL, except the same three articles from 2012?

My laptop fans are fucking loud and I need this shit ASAP!

I thought this thing looked pretty revolutionary when I first saw it. It is thin as fuck, doesn't make any noise, energy efficent and can be customized in a million different appearances. Did they find some serious flaw? Why can't I find more on this brilliant invention?

Anyone know anything?


1 post omitted. Click Reply to view.
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Anonymous 13/04/02(Tue)22:29 No. 14890 ID: 2b9b73

>>14889
Aw, really? That sounds really bad. There isn't even a way with less rpm fans? At least then you would reduce the noise.


>>
Anonymous 13/04/03(Wed)21:20 No. 14892 ID: a0e680

>>14890
You can, but it's more cost effective to invest in quieter fans from the very start.


>>
Anonymous 13/04/07(Sun)21:12 No. 14903 ID: 2b9b73

>>14892
Too bad, I had high hopes in this tech.




Virtual Reality Anonymous 13/03/11(Mon)19:30 No. 14800 ID: 208b5a [Reply]
14800

File 136302661931.jpg - (121.23KB , 531x755 , jm2.jpg )

Do you think there'll be virtual reality indistinguishable from reality in our lifetime?

Do you think there'll be a commercial market for VR purchaseable for families in their living room in our lifetime?

Do you think you would be able to import characters and people based on current digital images and videos?


>>
Anonymous 13/03/13(Wed)23:34 No. 14807 ID: c27ab4

in 10 years an untrained eye will not be able to tell the difference between reality and VR. think euclideons unlimited detail technology + oculus rift v2
regarding senses like touch and taste it's hard to say, a neurological link would probably be needed. maybe 20, 30 years.
I think we are at the brink of a major technological revolution the coming decades.


>>
Anonymous 13/03/30(Sat)20:50 No. 14876 ID: caee2f

>>14807
Perception - The reality beyond matter
https://www.youtube.com/watch?v=AqnEGu8VF8Y

TEDxRheinMain - Prof. Dr. Thomas Metzinger - The Ego Tunnel
https://www.youtube.com/watch?v=ZFjY1fAcESs

Graphene transistors give bioelectronics a boost
"Graphene-based transistors that respond to changes in chemical solutions could be used to link electronic devices directly to the human nervous system. That is the claim of researchers in Germany who have built arrays of devices that respond to changes in the electrolytes surrounding living cells. The team hopes that its research could result in retinal implants that could help some visually impaired people see images."

http://www.spacedaily.com/reports/Graphene_transistors_give_bioelectronics_a_boost_999.html

There are already many applications of brain-chip interfaces like artificial limbs and sight recovery.

Therefore, we may assume that if a human is born and sensory parts of the brain are being connected to the artificially created world, he won't be able to distinguish between artificial representation and the real representation.
Message too long. Click here to view the full text.




Anonymous 13/03/29(Fri)12:11 No. 14868 ID: cb9fa8 [Reply]
14868

File 136455551057.jpg - (48.67KB , 390x385 , incursion-map.jpg )

This flew right past me.

Quantum computing is a reality.

Nature (M. W. Johnson et al. Nature 473, 194–198; 2011)

How understands this stuff?
What are the implications for the future of the world in terms of food security, medicine, drug legalisation and defence?

I don't understand quantum mechanics or electronics so I won't speculate.

But, if we had asked a nuclear scientist at the event in the early developments of nuclear technology what it meant for the world, maybe we would have invested in the future of commercial analytical techniques in biomedicine, in game theoric polarised world research and a plethora of other things.


>>
Anonymous 13/03/29(Fri)16:14 No. 14869 ID: 3ffa90

Fucking hell. Must you start every goddamn thread?


>>
Anonymous 13/03/29(Fri)21:05 No. 14870 ID: 075634

>>14869
You're overreacting, only 70% have been as such...




Muons Anonymous 12/09/19(Wed)06:44 No. 14206 ID: ab2c51 [Reply]
14206

File 134802984550.jpg - (2.53MB , 1500x991 , arcs-and-sparks.jpg )

My professor was telling us how a colleague of his claimed that you could see the flash of a muon decaying inside your eyeball. Is this even possible? I mean, I know that sometimes the decay produces photons, but even inside your eyeball, can you see that? Is the ocular nerve sensitive enough for that?


12 posts omitted. Click Reply to view.
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Anonymous 12/11/02(Fri)01:32 No. 14340 ID: c1bebf

>>14212
>>14240
>>14339

Doing a little digging, it turns out we're all a little right, and a little wrong. If a single photon hits the retina, it WILL trigger a response from the sensory tissue. However, the signal will not be passed on to the brain until 5-9 arrive in 100ms.

So the eye DOES detect and respond to a single photon. It just doesn't bother telling the brain about it.

In other words, it depends entirely on what OP's professor means by "see".

http://math.ucr.edu/home/baez/physics/Quantum/see_a_photon.html


>>
Muons in your eyeballs G.R.L. Cowan 13/03/27(Wed)20:19 No. 14852 ID: c66fe2

"Muons lose energy at a fairly constant rate of about 2 MeV per g/cm^2 ... The mean energy of muons at sea level is still 4 GeV." (http://cosmic.lbl.gov/SKliewer/Cosmic_Rays/Muons.htm)

The aqueous stuff inside an eye must have density near 1 g/cm^3, so in travelling a 2-cm muon path through your eye, a typical muon should lose 4 MeV.

That should make a *lot* of visible photons, even if the muon doesn't decay. And the flux is one per cm^2 minute.

This makes me think that one possible reason people with dark-adapted eyes don't see muon flashes all the time is that the flashes are filtered out as not useful in mapping the outside world.


>>
Anonymous 13/03/28(Thu)03:23 No. 14857 ID: c1bebf

>>14852

But is that energy only ever emitted as photons?




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