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59 Comments
- jester55, on 10/10/2007, -9/+91i love how the scientists cant count. "is this 3? is this 4?"
- psygnisfive, on 10/10/2007, -1/+75It's all about reversability. Ask yourself, why does a dropped glass break, but the pieces never unbreak? Why dies batter bake into cake, but cakes never dissolve back into batter? It's not because it couldn't; the laws of physics have no dependence on the direction of time: the equations work equally well going from t = 1 to t = 0. The reason is primarily that at at t = 1, things are in such a massively changed state that reversing behavior would involve reversing trillions of trillions of particles all with precision. But in the case of this sort of example, the viscous fluid has significantly less molecular motion than water (which is why the drops stay where they are until you start mixing). That means that the minor pulling of the rotating cylinder is fairly regular and orderly, so reversing it's rotation reverses the fluid movement in almost the exact same way that it causes in. In this example, the viscosity of the fluid and design of the mixer (being a cylinder), makes the transition from t = 1 back to t = 0 feasible. You're no longer having to manually reverse trillions of molecules motion.
- newdigger, on 10/30/2007, -1/+63For us normal people, what did i just watch?
- AirPortPanic, on 10/30/2007, -3/+62I can't explain it... so it must be the work of the lord!
- Macuyiko, on 10/30/2007, -1/+44The level of stupidity of the Youtube comments never cease to amaze me: "its cgi you can tell.", "photoshopped", "They just runned the video backwards for the reverse part"... I really, really hope these were meant to be sarcastic :).
- dafishey, on 10/10/2007, -2/+42What you watched (the title of the article) is laminar flow, which is a deterministic flow: you can run it, it mixes, and then rewind and it comes back to its original state. this is in opposition to 'turbulent' flow, which is chaotic: you run it and it mixes up, and you run it backwards and it mixes more.
- Winters, on 10/10/2007, -0/+36Please I beg of you, never again link to a rm file. I just had a flashback from about 8 years ago and I didn't like it very much.
- dajuggernaut, on 10/10/2007, -5/+35I'll give you an A+ in science, but only a C+ in English.
- tandonmiir, on 10/30/2007, -3/+31That's unpossible!
- saleem, on 10/10/2007, -1/+28i never thought there would be digg videos on laminar vs. turbulent flow.
- blumph, on 10/30/2007, -4/+30brain says: http://upload.wikimedia.org/wikipedia/en/5/53/PsyduckKen.png
- psygnisfive, on 10/10/2007, -2/+26And I'm a linguistics major, to boot. ;)
I didn't proof read, and by the time I noticed the errors my 120 seconds had elapsed. Frownies. - rhinopig, on 10/10/2007, -0/+24This one was pretty good (I hope you can tell whether it is sarcastic or not)
" k1df1ghter (2 weeks ago)
In the spirit of YouTube users, I will say this is fake. I don't care under what conditions the experiment was done, I don't care if it was all one take, I just don't care. It is fake. What the video showed does not fit into my very basic understanding of the world, therefore it must be fake. I will now go and watch some other videos, and will call them fake too. " - pixelbasic, on 10/10/2007, -1/+22FINALLY! An explanation of how Superman saved Lois Lane from the earthquake.
- polypropglop, on 10/10/2007, -2/+22If you look close at 1:36 you can see the Virgin Mary telling Allah a joke.
- otaru123, on 10/10/2007, -2/+21I love Youtube users and their superior intellect!
"fake"
"its cgi you can tell." - dsmx, on 10/10/2007, -0/+13It's witchcraft I tell you, burn them, burn them all.
- nodonoug, on 10/30/2007, -3/+14unfortunately, I doubt they were being sarcastic.
- number9ine, on 10/10/2007, -0/+9No, that was cornstarch and water. It creates a non-Newtonian fluid (a fluid where the viscosity changes with the amount of strain you put on the fluid). Corn syrup is definitely a Newtonian fluid.
- greengiant2684, on 10/10/2007, -2/+10that word is perfectly cromulent
- Scheissen, on 10/10/2007, -0/+8I thought he said, "This is 3."
- nimawin, on 10/10/2007, -0/+7umm... CTRL + Z ??
- retrodavid, on 10/10/2007, -0/+7dugg for science
- GuruKid, on 10/10/2007, -1/+7Hey don't make fun of us!
there are 3 kinds of scientists, those who can count and those who can't. - lazyrussian, on 10/10/2007, -0/+5We're that smart or that curious :)
Anyway, we actually covered this experiment in our Biophysics Class. I can't completely recall while this works but it has somehting to do with no loss of memory (very little increase in entropy), and Einestein's relation of Diffusion and Viscosity to Boltzmann's Constand and Temperature (D*V = k*T)
Meh, I'll have to look it up later. - Wichy, on 10/10/2007, -1/+6What prevent us from traveling back in time is not having enough viscosity
- hillson, on 10/10/2007, -0/+4The first time I saw this performed was at a Biophysics retreat in grad school. Howard Berg, a professor who studies how bacteria move themselves about, used this demonstration to show how our intuition for the physical world contrasts greatly with what very small organisms experience. Very cool, and gets a great reaction from the audience.
- dajuggernaut, on 10/10/2007, -3/+7No, everyone knows this outside Gods realm. This is the work of the Flying Spaghetti Monster.
- dajuggernaut, on 10/10/2007, -1/+5Its the past leaking into the present.. its the exact opposite of yesterdays front page story, see: http://digg.com/general_sciences/Physics_Can_the_Future_Leak_Into_the_Present
- nodonoug, on 10/10/2007, -0/+3If you really believe that, take a good look at the ink drops before and after, they're not the same. They're very close, but it wasn't perfect laminar flow, and you can see the differences.
- punkyMunky, on 10/30/2007, -4/+7CORN SYRUP IS MAGIC!!
- dbug, on 10/10/2007, -0/+3Wow, just imagine the possibilities!
- biohazd, on 10/10/2007, -1/+4Please, tell me you're kidding. This isn't doing much good for my misanthropy.
- jimmiss, on 10/10/2007, -0/+2Tell me about it. This is vacation!!!
- l337phoenix, on 10/10/2007, -1/+3*headdesk*
- carnage, on 10/10/2007, -0/+2And what do you burn, apart from witches?
- Freonce, on 10/10/2007, -0/+2I learned something today.
Thanks! - Otto, on 10/10/2007, -0/+2The entry at wikipedia ( http://en.wikipedia.org/wiki/Laminar_flow ) has a link to this video as well: http://modular.mit.edu:8080/ramgen/ifluids/Low_Reynolds_Number_Flow.rm which is similar.
- themastersb, on 10/10/2007, -0/+2Einstein couldn't find his way home.
- jeffeb3, on 10/10/2007, -0/+2to be clear that liquid is between two glasses, I didn't get it at first, but the liquid is suspended between a glass container, and a glass object so that the liquid is relatively thin. They spin the inside glass object. Why are these videos always have a bunch of blank space during the experiment, but they never have the build up discussion?
- Lrn2Fish, on 10/10/2007, -0/+1Lol, he says "This is one..." and then tells a little story while hes spinning then .......... "This is two....." Silly Scientist
- pault107, on 10/10/2007, -0/+1Off with his head.
- inactive, on 10/10/2007, -2/+3Sigh... Why Youtube. Why?
- Bklynadam, on 10/10/2007, -0/+1thanks ralph
- xtmno3, on 10/10/2007, -1/+2Lies, I cite the Invisible Pink Unicorn's majesty on this one.
- dsgncr8or, on 10/10/2007, -0/+0Knew about this effect, and still sat thru the counting of spins wrong, just so i could see it reverse... think this effect is wild.
- bgfinkel, on 10/10/2007, -1/+1HOLY SHIZ thats insane
- superdoofus, on 10/10/2007, -1/+1@nodonoug
the mythbusters episode you referred to utilized corn starch, not corn syrup. - andrewsmith1986, on 10/10/2007, -1/+1black magic
- everfalling, on 10/10/2007, -2/+2you're all wrong. it's the benevolent work of the Celestial Teapot.
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