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Fishstick posted:This is also a good read re: nukes for meteors I had no idea that guy had a blog. Definitely a lot of interesting commentary (fun fact: change the pusher in the unit from tungsten to something lighter and you get a nasty weapon). The blog posts about muslims, guns, and girls are kind of weird though. DeusExMachinima posted:Freezing of your terrestrial assets aside, if the defending company has any other mobile resources nearby or mass drivers on large asteroids or the Moon, they might be able to forcibly evict you. What if claim law required a physical human presence on the body in question? Terrestrial claim law apparently requires demonstration of an intent to occupy. If you don't have boots on the ground, you don't own the ground. Might make for an interesting solution to the issue.
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| # ? Feb 21, 2013 17:41 |
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| # ? May 23, 2013 11:06 |
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kippa posted:So apparently Dennis Tito's new company is making a "major" announcement about a manned mission to Mars next Wednesday. Apparently going to launch in 2018 and will get to Mars and back in 501 days, there's a bit more info here: http://spaceref.com/mars/the-first-...rs-in-2018.html I'm skeptical, but let's take a look. A 500-day duration implies an opposition-class mission -- a high-energy transfer while the two planets are close to each other in their orbits. This kind of mission has the shortest overall duration, but it has high delta-v requirements and you only get to spend 30 days (maximum) at Mars. It may even be simply a flyby followed by a free-return. (Interestingly, this JPL paper [PDF] says there's a near-optimal free-return launch window in 2017, not 2018, so I'm going to guess the plan involves a month in Martian orbit and maybe a Venus flyby on either the outbound or inbound leg of the trip.) So what would this require? Well, you'd need an entry capsule for Earth return, which a Dragon would fit nicely. A bit of living space during the year and a half mission would be nice, so let's put in a Bigelow-style inflatable hab module. If (and this is a BIG if) your plan involves actually landing on Mars, you're going to need a way down and a way up. For the way down, a Red Dragon might work. For the way up, some sort of ascent vehicle, probably placed well beforehand. Now you need a lot of in-space delta-v to haul all this hardware around the solar system. Total delta-V for a conjunction-class mission is about 7.8 km/s, so we're probably looking at multiple upper-stages cobbled together in LEO, with at least one stage using storable propellants so it'll work months after launch to get you out of Mars orbit and on track back to Earth. Finally, you need to launch all this stuff into space. Falcon Heavies would be nice, but if necessary you could probably get by with more launches of smaller boosters like Atlas Vs or Delta IVs. COULD this be done? If money was no object, they started today, development went perfectly, and they didn't mind not testing any of this stuff unmanned first... yeah, they might actually be able to pull it off. But in the real world, I wouldn't give them very good odds.
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| # ? Feb 21, 2013 18:13 |
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Beer4TheBeerGod posted:What if claim law required a physical human presence on the body in question? Terrestrial claim law apparently requires demonstration of an intent to occupy. If you don't have boots on the ground, you don't own the ground. Might make for an interesting solution to the issue. Considering how much payload a manned flight would add to a probe that doesn't need humans on the spot to do its job, I doubt it. It'd be a damper on industry and probably cost lives that didn't need to be put in danger in the first place. If it becomes enough of a sore spot between terrestrial governments and in-situ propellant depots become commonplace, you might be right. But even then, legal tradition would be established requiring only unmanned presence to have a claim (else how did those depots get stocked from asteroid mining in the first place?). Powered Descent posted:COULD this be done? If money was no object, they started today, development went perfectly, and they didn't mind not testing any of this stuff unmanned first... yeah, they might actually be able to pull it off. But in the real world, I wouldn't give them very good odds. The ISS tours of duty are only six months and require some special treatment to recoup lost bone mass. Eighteen months is a frightening prospect with so little prep time and experience.
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| # ? Feb 21, 2013 18:23 |
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DeusExMachinima posted:Considering how much payload a manned flight would add to a probe that doesn't need humans on the spot to do its job, I doubt it. It'd be a damper on industry and probably cost lives that didn't need to be put in danger in the first place. If it becomes enough of a sore spot between terrestrial governments and in-situ propellant depots become commonplace, you might be right. But even then, legal tradition would be established requiring only unmanned presence to have a claim (else how did those depots get stocked from asteroid mining in the first place?). Well the manned presence would only be required if the claim itself warranted the effort. So for example if a company probes out a bunch of asteroids and discovers the one they like, only then would they have to send a manned mission to claim it. But you're right; the economic costs of mandating such an activity would be prohibitvely expensive and no company would want to do the exploration if they couldn't guarantee the right of exploitation. Still it would be kind of cool.
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| # ? Feb 21, 2013 18:35 |
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DeusExMachinima posted:Considering how much payload a manned flight would add to a probe that doesn't need humans on the spot to do its job, I doubt it. It'd be a damper on industry and probably cost lives that didn't need to be put in danger in the first place. If it becomes enough of a sore spot between terrestrial governments and in-situ propellant depots become commonplace, you might be right. But even then, legal tradition would be established requiring only unmanned presence to have a claim (else how did those depots get stocked from asteroid mining in the first place?). There are I believe 2 people special extended year long stays on the ISS in a year or two to help study the effects for long duration better. If I remember correctly, Scott Kelly is one of them.
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| # ? Feb 21, 2013 18:43 |
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Speaking of fusion, here's a recent article I found on NASA cold fusion research. http://www.gizmag.com/nasa-lenr-nuclear-reactor/26309/ quote:
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| # ? Feb 21, 2013 22:26 |
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I love the mad scientist logic in that one paragraph: Some labs testing it blew up or melted their windows, so there must be potential!
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| # ? Feb 22, 2013 00:21 |
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Charlz Guybon posted:Speaking of fusion, here's a recent article I found on NASA cold fusion research. That is cool as hell, but I'll stay skeptical just because in the last few years "scientist at NASA" has not exactly been the seal of quality research. OTOH I'm ready to be convinced. I firmly believe there are useful ways of getting energy out of QM "tricks" like this once we know more about how to manipulate atomic processes.
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| # ? Feb 22, 2013 01:21 |
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I guess there are worse things to throw money at than cold fusion. At least Zawodny seems more level headed about it than the vast majority of LENR "researchers." I'll stay skeptical because he hasn't identified a plausible underlying mechanism by which it can happen, but like the Alcubierre Drive, this kind of fringe research could stumble across other valuable findings, whether practical to use or simply advancing knowledge.
GWBBQ fucked around with this message at Feb 22, 2013 around 01:27 |
| # ? Feb 22, 2013 01:24 |
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I'd rather see the money be spent on that than billion dollar defense projects that have a 75% chance of not being fielded anyway.
Beer4TheBeerGod fucked around with this message at Feb 22, 2013 around 02:38 |
| # ? Feb 22, 2013 02:31 |
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GWBBQ posted:I guess there are worse things to throw money at than cold fusion. At least Zawodny seems more level headed about it than the vast majority of LENR "researchers." I'll stay skeptical because he hasn't identified a plausible underlying mechanism by which it can happen, but like the Alcubierre Drive, this kind of fringe research could stumble across other valuable findings, whether practical to use or simply advancing knowledge. He actually does propose a mechanism, a sort of inverse beta-decay. It's not strong-force fusion, it's weak-force fusion - turning an electron/proton pair into a neutron. The neutron is absorbed by a nucleus, which then decays and, it is hoped, emits more energy than the initial e/p combination absorbed. It seems plausible, at least. Apparently there have been some pretty convincing demonstrations of neutrons being produced by this method, but not in a particularly controllable fashion. There's just enough evidence that something may be going on that it seems worth the craps shoot that it may be ultimately useful. I remain skeptical but hopeful about it. My suspicion is that if it does actually work, they'll find that the energy input needed to generate the neutron is greater than the energy released by the nuclear decay in most cases.
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| # ? Feb 22, 2013 02:53 |
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So long as fusion is just around the corner we don't have to develop proven fission technologies and we can continue using fossil fuels.
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| # ? Feb 22, 2013 03:12 |
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![]() If you want to ask the question you need to post it to their Facebook (https://www.facebook.com/SpaceX) in the comment thread for this photo. Gonna hope to see some goony questions asked on the 1st!
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| # ? Feb 22, 2013 07:31 |
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Beer4TheBeerGod posted:I had no idea that guy had a blog. Definitely a lot of interesting commentary (fun fact: change the pusher in the unit from tungsten to something lighter and you get a nasty weapon). Yyeaaaaaaah.. He's got some political issues going on (eg; 'Would be okay with getting rid of NASA if we also got rid of the Social Security Admin'-type of libertarian), but the space stuff is really interesting to read, and I bought one of those blueprints as well.
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| # ? Feb 22, 2013 07:45 |
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| # ? Feb 22, 2013 08:01 |
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Still incredibly dubious about this, but it would be amazing if it happened. The psychological impact of seeing humans fly past Mars would definitely make a future surface mission seem more possible.
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| # ? Feb 22, 2013 09:52 |
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That's a long time to be in space. Isn't the longest time spent in one flight like 400ish days, and that was on Mir which was probably a little more comfortable than a mars orbiter.
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| # ? Feb 22, 2013 10:11 |
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About 438 days according to http://en.wikipedia.org/wiki/List_o...n_space_flights
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| # ? Feb 22, 2013 10:17 |
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Wasn't too far off :v. But yeah, that was on a space station with what I assume have regular re-supply flights. ~550 days of freezedried food, o2 and water (even with their recycling capility) is huge. According to this (which is really interesting), for shuttle missions:quote:Weight allowed for food is limited to 3.8 pounds per person per day, which includes the 1 pound of packaging for each person each day. That's nearly a metric ton of food per person for a 550-day mission, not including packaging since I'm assuming you'd use bulk packaging.
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| # ? Feb 22, 2013 10:23 |
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Fishstick posted:That's nearly a metric ton of food per person for a 550-day mission, not including packaging since I'm assuming you'd use bulk packaging. The excessive-sounding weight of packaging is probably because of the nature of freeze-dried meals. A mars mission would probably find some way to economize, but packaging would still be a huge weight cost. "Cooking" freeze-dried food is just injecting hot water into the packaging, so bulk packaging beyond "six servings of the same meal in one bag" wouldn't really be possible. And the merits of even doing that are debatable. They'd have to all eat the same thing for every meal, and divide that bulk meal up evenly. Individual packaging lets each person choose a different meal and ensures that each person gets the correct serving size. Also, the bag serves as the "plate" that they eat from, so one big bag would have everyone eating from the same plate, making it even harder to portion things correctly. I don't really see space food ever coming in any form other than individually-bagged meals.
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| # ? Feb 22, 2013 11:20 |
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Fishstick posted:Wasn't too far off :v. But yeah, that was on a space station with what I assume have regular re-supply flights. ~550 days of freezedried food, o2 and water (even with their recycling capility) is huge. According to this (which is really interesting), for shuttle missions: Couldn't they send an unmanned resupply craft to Mars before launching the manned orbiter and have them rendezvous to give the astronauts more food? It'd cut down on weight for the initial launch, although I'd imagine it'd have a huge impact on the budget.
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| # ? Feb 22, 2013 11:30 |
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Just pack in a few tons of almonds.
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| # ? Feb 22, 2013 12:48 |
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Hate to be a killjoy, but a Mars flyboy seems kind of pointless. If you landed on the planet you could do some really interesting science, but they can't really do anything in a flyby that a satellite couldn't do better can they?
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| # ? Feb 22, 2013 12:52 |
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It's a valid criticism. But, if you can do a flyby, then you've proven that you can get people there. That makes a manned mission far more likely to happen. If nothing else it's a good way to test out all the logistics / technology needed for long term spaceflight.
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| # ? Feb 22, 2013 13:09 |
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Breaky posted:It's a valid criticism. But, if you can do a flyby, then you've proven that you can get people there. That makes a manned mission far more likely to happen. If nothing else it's a good way to test out all the logistics / technology needed for long term spaceflight. Not neccesarily because the dV/engineering requirements are different for a braking burn into orbit with additional staging etc.
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| # ? Feb 22, 2013 13:11 |
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Edit: ^^^^^^ Just do it like in KSP and aerobreak that sucka. ![]() Just got confirmation that we will be getting a webcast on the 25th for the Indian Satellite launcher, hosted by the Indian Government it seems. Webcast will be here: http://webcast.gov.in/live/
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| # ? Feb 22, 2013 13:12 |
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thehustler posted:Not neccesarily because the dV/engineering requirements are different for a braking burn into orbit with additional staging etc. Sure. But we already know how to get slightly smaller things to the surface. If we can say "ok we can move humans across planets and keep them fed / sane / alive" that's a good step. But, you guys are right, this isn't really needed as we could just do that in LEO as an experiment.
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| # ? Feb 22, 2013 13:12 |
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Last time I checked we haven't really succeeded in long term isolation experiments that simulate that on Earth so uh it will be interesting if nothing else.
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| # ? Feb 22, 2013 14:34 |
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OMGVBFLOL posted:The excessive-sounding weight of packaging is probably because of the nature of freeze-dried meals. A mars mission would probably find some way to economize, but packaging would still be a huge weight cost. "Cooking" freeze-dried food is just injecting hot water into the packaging, so bulk packaging beyond "six servings of the same meal in one bag" wouldn't really be possible. And the merits of even doing that are debatable. They'd have to all eat the same thing for every meal, and divide that bulk meal up evenly. Individual packaging lets each person choose a different meal and ensures that each person gets the correct serving size. Also, the bag serves as the "plate" that they eat from, so one big bag would have everyone eating from the same plate, making it even harder to portion things correctly. Just design a machine that takes a big bag of X meals and dispatches the same dose each day? I mean this is simple as it gets. You could have various different meals packaged in bulk and the very simple device would split accordingly and provide food. Also while eating the same thing for a long period of time would probably not be very interesting from a tasting point of view, if all the nutriments necessary for the body were there, would there be any problem? The guys aren't exactly on a vacation trip
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| # ? Feb 22, 2013 15:20 |
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Le0 posted:Just design a machine that takes a big bag of X meals and dispatches the same dose each day? I mean this is simple as it gets. You could have various different meals packaged in bulk and the very simple device would split accordingly and provide food. I like the mental image of a soft-serve machine in space.
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| # ? Feb 22, 2013 15:27 |
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blugu64 posted:I like the mental image of a soft-serve machine in space. That's probably what it would be. Bulk-store freezedried food and have it rehydrated with warm water as it comes out. A dollop of meatpaste and a dollop of veggiepaste
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| # ? Feb 22, 2013 15:29 |
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Do you want the SoyCrunch or the Lentil Strawberry Supreme today, sir?
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| # ? Feb 22, 2013 15:37 |
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Shanakin posted:Last time I checked we haven't really succeeded in long term isolation experiments that simulate that on Earth so uh it will be interesting if nothing else. What about this one that ended last year? That seems like a success. Le0 posted:Just design a machine that takes a big bag of X meals and dispatches the same dose each day? I mean this is simple as it gets. You could have various different meals packaged in bulk and the very simple device would split accordingly and provide food. That's a possibility, assuming the machine itself doesn't take up more weight than whatever it is you save. If there's sufficient flavor and variety in whatever the machine produces then it could work. Another option would be something akin to edible packaging, like a fruit leather material, although that could get messy very quickly. quote:Also while eating the same thing for a long period of time would probably not be very interesting from a tasting point of view, if all the nutriments necessary for the body were there, would there be any problem? The guys aren't exactly on a vacation trip You really can't underestimate the value of morale on a trip this long. Even if you take the most psychologically stable people on the planet there's no way of knowing how they'll survive after almost two years cramped together. Forcing them to eat unpleasant food (and after enough time everything gets unpleasant) will exacerbate the problem and increase the risk of a human factor affecting the mission.
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| # ? Feb 22, 2013 15:42 |
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Beer4TheBeerGod posted:
Unexpected side effect: all the food gives you gas. Manned mission terminated at MET 168h. I wonder how feasible 3D-printing food would be by the near future.
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| # ? Feb 22, 2013 15:48 |
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Unormal posted:Do you want the SoyCrunch or the Lentil Strawberry Supreme today, sir? Project Rho (and spirulina) to the rescue! Beer4TheBeerGod posted:You really can't underestimate the value of morale on a trip this long. Even if you take the most psychologically stable people on the planet there's no way of knowing how they'll survive after almost two years cramped together. Forcing them to eat unpleasant food (and after enough time everything gets unpleasant) will exacerbate the problem and increase the risk of a human factor affecting the mission. I think I'd snap and go on a killing spree armed with a spacesuit helmet about the time we got there and I remembered it was all for nothing/just a flyby. Another strong argument to wait for faster travel methods.
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| # ? Feb 22, 2013 15:56 |
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Faster travel isn't going to just happen on its own if nobody is trying to get to Mars or where ever.
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| # ? Feb 22, 2013 16:08 |
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Eating in space seems quite nice actually. http://www.youtube.com/watch?v=AZx0RIV0wss
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| # ? Feb 22, 2013 18:12 |
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Fishstick posted:That's probably what it would be. Bulk-store freezedried food and have it rehydrated with warm water as it comes out. A dollop of meatpaste and a dollop of veggiepaste Crackers would never work. Too many undesirable crumbs in zero-g.
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| # ? Feb 22, 2013 18:16 |
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Fishstick posted:Unexpected side effect: all the food gives you gas. Manned mission terminated at MET 168h. It's already been done with chocolate.
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| # ? Feb 22, 2013 18:20 |
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| # ? May 23, 2013 11:06 |
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withak posted:Crackers would never work. Too many undesirable crumbs in zero-g. You'd think so, but
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| # ? Feb 22, 2013 18:32 |

























