Friday, March 1, 2013

Sahara Desert dust affects California water supply, study finds

High altitude dust blown thousands of miles across the Pacific from Asian and African deserts can make it rain and snow in the Sierra Nevada, according to new research that suggests tiny particles from afar play a role in California's water supply.

The study, published Thursday in the online edition of the journal Science, grew out of researchers' questions about two similar Sierra storms in winter 2009. Even though the storm systems carried the same amount of water vapor, one produced 40% more precipitation than the other. When scientists analyzed ground samples of the rain and snow dropped by the wetter storm, they found an abundance of Asian dust.

Two years later, a science team spent days flying through Sierra storm clouds on a government research plane, collecting an array of atmospheric samples at the same time that instruments below in the Tahoe National Forest took ground measurements. The results: When dust and tiny biological particles from halfway around the globe were detected in the clouds swirling above the Sierra peaks, there was more rain and snow.

"There was this sort of magical switch," said Kim Prather, a UC San Diego atmospheric chemist and coauthor of the paper. "The days with dust you see one thing, and the days without dust you see a different thing."

Previous research by one of the paper's 12 authors had shown that windblown mineral dust transported long distances acts as a seed for atmospheric ice that is key to forming a significant amount of precipitation.

But the scientists said the Sierra study is the first direct documentation that dust and biological particles from as far away as the Sahara Desert and the deserts of China and Mongolia can help wring water out of the sky in the Western United States.

"The fact that something happening on another continent in terms of dust generation could influence precipitation patterns in the U.S ? that's a challenging problem," said Marty Ralph, a coauthor and research meteorologist with the National Oceanic and Atmospheric Administration.

Researchers identified the source of the airborne dust by its chemical fingerprint and by looking at satellite data and numerical weather models that track the global trajectory of air masses. The Sierra range is the first thing the particles hit in California. Whether they have the same effect on precipitation in other West Coast mountains, such as the Cascades, or more interior ranges, such as the Rockies, is unknown.

Ralph was initially dubious that aerosols ? as dust and other atmospheric particles are known ? have much of an impact on whether a cloud gives up water or holds on to it.

But the difference in the output of the 2009 storms "was a bit of a scientific epiphany," he said. "I came into this very skeptical and have come to where I am now, coauthoring a paper that's saying aerosols can have a significant impact."

The next step, he added, is to quantify that precipitation effect.

The Sierra research was part of a three-year field study, called CalWater, that investigated influences on California rain and snow. "I think it has huge implications," said Guido Franco of the California Energy Commission, which funded the program. "It may counteract some of the effects of a warming climate."

Scientists predict that, in general, Earth's wet regions will become wetter with global warming and dry regions will become drier. That could mean more windblown desert dust in the atmosphere and, if the Sierra results bear out, more precipitation in the Northern California mountains that provide the state with roughly a third of its water supply.

Marshall Shepherd, a University of Georgia research meteorologist and president of the American Meteorological Society, was not prepared to go that far. "I don't know if we can make that leap yet and say that [more dust] is going to lead to large global changes in precipitation patterns," Shepherd said. "There are so many other competing factors."

bettina.boxall@latimes.com

Source: http://feeds.latimes.com/~r/latimes/news/science/~3/p2_zQYFyUVM/la-me-water-dust-20130301,0,4397778.story

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Looxcie HD Explore


Last year's Looxcie 2 was a disappointment. The idea of turning a Bluetooth headset into a video camera is interesting, but if you can't point the camera in the right direction it doesn't work very well. If the video quality isn't particularly good, that's another problem. This time around, Looxcie abandons the Bluetooth headset idea and focuses on making a great wearable camera?with much better results. The Looxcie HD Explore may not double as a headset, but with 720p video at 60fps, 1080p video at 30fps, and a variety of included mounts including a hat clip, this $329.99 (direct) camera is a great way to record things from your own point of view.

Design and Mounting Options
The Looxcie HD is a plain gray plastic rectangle measuring 1.4 by 1.9 by 3.8 inches and weighing 2.6 ounces, a little bit larger than a disposable lighter and equipped with a prominent battery that sticks out on one of the sides to give it a trapezoidal profile. The battery covers the microSD card compartment, which accepts a card readily but doesn't let you remove it without some very tricky prying, because the installed card sits flush against a little dip in the case that lets you insert the card in the first place.

The butt of the Looxcie HD holds a removable rubber panel that covers a micro USB port and a three-way power switch that lets you turn the camera off, turn it on and set it to Wi-Fi, or turn it on and disable Wi-Fi. The front holds the small lens and pinhole microphone, flush against a flat, smooth face. Besides those details, the only distinguishing features of the camera itself are a pair of rows of small, rectangular holes to let it snap securely into the included hat clip.

The camera comes with a stick-on helmet mount, a clamp-on bike mount, and a hat clip, which are necessary if you don't want to hold the Looxcie HD awkwardly while you use it. This is a mounted camera, and it's not intended to be held like point-and-shoot cameras. The helmet mount consists of a stick-on panel that you can put on a helmet or any smooth, rigid surface, and the bike mount consists of a clamp that goes over handlebars. Both mounts have a solid notch where a universal Looxcie HD holder fits securely; put the Looxcie HD in the foam ring of the holder, tighten the clamp, then slide it into either mount's notch.

The hat clip is a simple clip with a two-jointed arm that connects to a C-shaped bracket that holds the camera securely with both the aforementioned holes and two hook-and-loop straps. The hat clip is probably meant for use with the camera above the clip, but I found it worked just as well with the camera below the clip, placed right in front of one of my eyes to ensure it was pointed at whatever I was looking at. Wearing the clip this way offered me the added benefit of feeling like a cyborg.

If the three mounts aren't enough for you, you can buy additional mounts from Looxcie like a vented helmet mount, a windshield mount, and a tripod mount for $25 to $40. You can also get add-on wide-angle, macro, zoom, and fisheye lenses for $20 to $25 (with the wide-angle and macro lenses available together as a $20 pack). I didn't test any of the optional accessories, but the Looxcie HD and its included accessories were enough to evaluate the camera itself.

Interface, Performance, and Conclusions
While you can record just by pressing the Record or Instant Clip buttons on the Looxcie itself (the latter snapping a quick 30-second clip), most of the camera's features must be accessed through the Looxcie iOS and Android apps. The app turns your phone into a mobile viewfinder, which refreshingly has only a split second of lag and displays the video very smoothly. The app lets you change resolution settings between 1080p at 30fps and 720p at 60fps, 48fps, and 30fps. You can change the lighting mode to adjust for white balance, and even stream video online through Looxcie's live broadcast feature. You can also buffer video to continually capture and discard footage, then hit the Instant Clip button on the camera or in the app to save a 30-second instant replay video. You can change the settings by connecting the Looxcie HD to your computer and running the Looxcie software, but it's much more convenient to change settings (especially lighting) while you shoot.

The Looxcie app uses Wi-Fi to connect to the Looxcie HD, so if you broadcast it'll have to be over your mobile data plan. This means livestreaming video can be tricky, but it also means you can broadcast video to the Internet from anywhere with a $330 camera and a smartphone instead of a satellite van and a camera crew.

Video quality is relatively clear and smooth, but some noticeable tearing occurs when the camera is moved quickly back and forth at 1080p at 30fps. A walk down the street and through a park showed details in signs, trees, and walkways. 720p video at 60fps looks much smoother, but tearing can occasionally occur with fast lateral motion. While it's lower resolution, you should probably record in 720p at 60fps most of the time, simply because the video seems so much cleaner and blur-free. This is ostensibly an action camera, after all, but even walking around and panning through the PCMag Labs looks better at 60 fps.

The Looxcie HD is a comprehensive action camera and livestreaming system that lets you record anything from sports action to just walking around, and its smartphone app is extremely useful. The Looxcie HD has improved leaps and bounds over the Looxcie 2, and is a great choice for shooting action from a first-person perspective. If you don't have a smartphone, though, it's more limited. While you can record without a smartphone, it means you can't see what the camera is seeing, change the settings on the fly, or stream video. If you want first-person video without the need of a smartphone (and don't need helmet or bike mount support), Pivothead Video Recording Eyewear offers a more streamlined setup at the cost of video quality. If you don't want to spend three digits on a wearable camera, the MeCam is far harder to use and the video doesn't look nearly as good, but it's $50 and you can pin it onto your clothes.

More Camcorder Reviews:
??? Looxcie HD Explore
??? MeCam
??? Zoom Q2HD Handy Video Recorder
??? Panasonic HC-V700
??? Panasonic HC-V700M
?? more

Source: http://feedproxy.google.com/~r/ziffdavis/pcmag/~3/7sjHvBUNpVo/0,2817,2416069,00.asp

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Reducing Hospital Readmissions: An Interview with Robert Wood ...

This is a transcript of my recent podcast interview with Anne Weiss of the Robert Wood Johnson Foundation.

caregivers policyDavid E. Williams: This is David Williams, author of the Health Business Blog.

I?m speaking today with Anne Weiss. She is Quality/Equality Health Care Team Director and Senior Program Officer at the Robert Wood Johnson Foundation.

The Foundation recently released a report called The Revolving Door: A Report on US Hospital Readmissions, which uses data from the Dartmouth Atlas Project to show that many Medicare patients are readmitted to the hospital after being discharged. The report also includes results from interviews with patients and providers to provide insights into how to reduce avoidable readmissions.

Anne, thanks for joining me today.

Anne Weiss: Thanks for having me.

Williams: Anne, consistent with other Dartmouth Atlas Reports I?ve seen, there?s a lot of emphasis in this one on regional variation. So, my question to you is how significant is this regional variation for readmissions and to what extent do the outliers actually represent best and worst practices that should be emulated or avoided?

Weiss: We do see pretty significant variation in the rates of readmission for Medicare patients who go home after identical surgeries or identical medical problems. There are very different experiences around the country. This is 2010 data and we saw readmission rates for surgical patients ranging from 18% in the Bronx to 8% in Bend, Oregon. For medical readmission, again, 18% in the Bronx down to 11% in Ogden, Utah.

So it?s significant variation. This study is not designed to tell us about the practice patterns in these areas. We looked strictly at admissions and post-acute care. We do know that there are a lot of different reasons behind this kind of variation. You could see differences in the underlying health status of the patients. You can see differences in the quality of hospital care including discharge planning. You can see best and worst practices in care coordination. And this is really important; you can see a lot of differences in the availability of primary care locally and the availability of hospital beds.

We know that the Dartmouth Atlas has already demonstrated that the local supply of hospital beds drives practice patterns. So other things equal, I think we can assume that when there are more hospital beds, patients are more likely to be admitted and readmitted to the hospital.

So, the short answer is we don?t learn a lot about what the best and worst practices are from looking at the Dartmouth data. But it does tells us it?s a local problem; and our emphasis is on helping people at the local level look at their market circumstances and talk about solutions that will work for them.

Williams: It looks from the report that there?s been only limited progress on reducing readmissions, even though readmissions are something that people have at least been looking at for awhile. And it also seems like some of the efforts that looked promising initially have not proven to be sustainable. I realize it?s 2010 data, so maybe things have changed from there. I?m wondering whether there are examples of programs or approaches that had been shown to work well over extended periods of time.

Weiss: When we released the report, we featured a couple of models that do seem to have been picked up widely enough that I think it gives us hope that they can sustain their progress.

One is the Care Transitions Intervention, widely associated with Eric Coleman, a physician at the University of Colorado. It?s a four-week program with a transition coach who helps patients with complex conditions manage their medications and helps them know what to do when their condition gets worse. This has been picked up by about 750 organizations, including 34 who are a part of a major Medicare initiative, the Care Transitions Program. I have not seen specific data, and obviously, it hasn?t been years since this is in place. but the degree to which it has been picked up is pretty promising.

The other program that we featured is the Transitional Care Model developed by Mary Naylor (a nurse at the University of Pennsylvania) along with her colleagues. They provide very comprehensive training in the hospital and then follow up at home for chronically ill high-risk older patients. They use transitional care nurses. They have the skills of a nurse and the care manager and also a patient advocate. I know they?ve had a lot of very promising conversations with health plans and others. So again, I think that?s a sign that they are poised for the kind of sustainability you?re asking about.

I do want to make one other point about some of the programs that we?ve seen developed in communities that are involved in the Foundation?s signature initiative, Aligning Forces For Quality. This is the Robert Wood Johnson Foundation?s major effort to improve quality and reduce cost in 16 targeted markets around the country. And we?ve seen initiatives in places like Cleveland, Memphis, Maine and Oregon that haven?t been in place for a long time. We don?t have data that say that they?re sustainable, but the fact that they?re embedded in a larger community effort where there?s a great deal of transparency is promising. In many of these communities, there is a publicly available report online that compares hospital readmission rates.

They?re in communities that are working on payment reform, unbundled payments. They?re in communities that are working hard to build quality improvement infrastructure and to engage patients and families in demanding better care. I think that offers a lot of potential to sustain a good care transitions effort, although I can?t say today that we know that all these efforts will sustain themselves.

Williams: What can you say about individual patients and their families or caregivers who are perhaps in a region of the country that has above average readmissions, whether they?re in the Bronx or somewhere not quite as much of an outlier? Is there anything that an individual patient can do even in places where such programs are not in existence? And is there any evidence or do you have a sense of whether there are certain patients, perhaps those with higher levels of education or income, that are in a better position to make an impact on whether they are re-admitted?

Weiss: I don?t know from this study. We don?t know a lot about the specific characteristics of the patients. However, I think with rates that are this high, it?s not a problem that?s confined to patients who have low literacy or low incomes. I think if we talk about some of the things that patients and families can do, which I?ll mention in a moment, it suggests that these are things that can be done in a variety of socio-economic circumstances. So I don?t think it?s wholly dependent on family income or education level, although that helps.

The single most important thing we tell people to do is to ask questions, not to be afraid to bother the doctors and nurses and pharmacists, to keep asking until you understand the answer, and when you do get an answer to say it back, to repeat the answer to make sure you?ve understood it.

The second major area is to leave the hospital with a detailed written plan that covers two things ? medications and appointments. So, a written list of medications with instructions about when and how to take them and a written list of follow-up appointments. The appointments are very important. If people have trouble making appointments or they don?t have a doctor, a family doctor, or the right specialist to go to, you can ask the hospital for help. And for both of these things, the medications and the appointment, I think it?s really important to involve a family member or a friend to make sure that they understand what could be done and they can help with things like transportation and making sure that you keep those appointments.

The last thing we tell people to do is to know what to do if you don?t feel well. Know the danger signs and know what you?re supposed to do if your symptoms got worse. I think it?s obvious that these things are more challenging for people who have low literacy or low health literacy. But I think all of them are things that any patient and family can try to become more engaged in.

I also want to mention that we have a great many tip sheets and other resources for patients at the website we set up for this initiative, which is called CareAboutYourCare.org. There?s a lot of information there that is really helpful for people from a very broad range of backgrounds and circumstances.

Williams: For a patient or a caregiver who is not currently contemplating a hospital visit, are there things that can be done perhaps structurally, and not just behaviorally, to try to make it less likely that a readmission would be needed? So for example, does it matter if a patient picks a primary care physician who practices as part of an integrated delivery network? Is there a difference in readmissions if the primary care practice uses hospitalists? Does it matter what type of health plan is used?

Weiss: Intuitively, it does seem that being part of an integrated system, your doctor being able to see you in the hospital, that those things should make a difference, but I have not seen data on this.

I will say that we conducted extensive interviews with patients and providers as part of the study and we did hear that the use of hospitalists can lead to more fragmented care, because the doctor isn?t always glued in to what happened in the hospital. That doesn?t mean that hospitalists are bad but it may mean that an intervention has to have an explicit step of getting the information back to the primary care doctor. And watching my parents in the health care system, I can?t think of how many times somebody threw a clipboard on their feet in the ambulance, and that was the extent of the information transfer.

Again, I haven?t seen information that compares the experience as patients in an integrated system or not. That does seem appealing, although we hope anyone who follows the weekly story about the safety implications of electronic health records can tell you that even in a completely integrated system, people miss pieces of information that were answered in one clinical setting and are relevant in another. So I don?t think you can let your guard down just because you?re in an integrated system. But you?re right, it?s promising.

And I know you said you wanted structural answers and not behavioral ones, but in my heart, I don?t think at this point in our health care system that there is a substitute for people understanding their conditions, understanding the behaviors that put them at risk, getting information that was proven to work, talking to the doctors, participating in making informed choices. And I don?t think we have the health care structure in the market yet that allows us to stop behaving that way as patient and consumers.

Williams: Fair enough.

So this sounds to me, Anne, like a problem that?s big, complex, perhaps even intractable. But the bright side of that might be some opportunities for entrepreneurs who are looking at ways to address elements of this readmission challenge. Any thoughts that you have for folks that are contemplating businesses in this area about where they might want to point their compass?

Weiss: A couple of things. I think the study does tell us that this is a local problem. And one thing we heard very strongly during all the public events was that you don?t pick something up in one market and just turn the key and it works in another market. Reinvention ? what was it that somebody said ? replication is reinvention. So, I think it?s important for entrepreneurs to think about that local market customization. That?s one point.

I think there is room for entrepreneurship across the continuum, whether it?s home care, whether it?s alternatives to the emergency department in the middle of the night, whether it?s new mobile technology. We heard from a patient who had a PDA that allowed him to answer five questions about his breathing condition every day; his nearest kin could monitor his status from afar and see how he was doing. So you could see all kind of mobile apps that could do that.

I think we have a payment system right now in this country where there?s a lot of financial rewards to a lot of people from the admissions. So for an entrepreneurial solution to work, it?s going to have to pay better or differently from readmission. The Medicare policy for readmission will start to rebalance that equation, but I think that?s a challenge.

The last thing I want to say is probably a little provocative to say to your readers. But I will say it anyway. I?ve been interviewed frequently about things like the company that provides care coordination to large employer groups. ?If you get cancer, our company will come in and manage all your appointments and help you keep track of all the billing and everything.? And to me, that?s a symptom of what?s wrong with our health care system. And people will hold it out like, ?Isn?t this great that we?re helping patients.? And I think that is true. I do think that a lot of the entrepreneurial opportunities have a lot of potential for improved care. But the problem we?re seeing here is a bad problem and my hope would be that we have a health care system that is patient centered enough that we don?t always need entrepreneurship to cure the ills that shouldn?t exist in the first place.

So I have mixed feelings about it but I do think that there are a lot of opportunities in the short run to make things better for patients and family.

Williams: I see on the motto of Children?s Hospital things like, ?Until there?s no more childhood illness.? I think the children?s hospitals are busy trying to put themselves out of business. But they have no real fear of that happening in the near term. This may be something similar.

Weiss: Right, I mean it?s sort of like the argument we often have on primary prevention. And yes, we definitely can prevent a lot of chronic illness, but most cases of cancer are not preventable. We don?t know enough about them to prevent them. It?s a lot of things, so we still have a lot of room to make our health care system perform better and meet people?s needs. Some of the best opportunities right now, I think, are coming from innovative entrepreneurs.

So, in the short run, I think there is room for that. I just think it?s important for us to also keep track of the overall impact of the system on patients.

Williams: I?ve been speaking today with Anne Weiss from the Robert Wood Johnson Foundation. We?ve been talking about a new report on hospital readmissions and about RWJ?s Care About Your Care Initiative.

Anne, thank you so much.

Weiss: Thanks for having me.

image:?interview/shutterstock

Source: http://healthworkscollective.com/davidewilliams/86426/reducing-hospital-readmissions-robert-wood-johnson-foundation-s-anne-weiss

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HBT: Forearm irritation shelves LA's Crawford

Carl Crawford won?t hit or throw for at least a week because of forearm tightness, manager Don Mattingly announced today.

Players taking time off with aches and pains is a very common occurrence early in spring training, but in Crawford?s case it?s a much bigger worry because it?s related to his Tommy John elbow surgery last year. For now the Dodgers are saying he has ?minor nerve irritation? and the ligament isn?t an issue.

Mattingly told Eric Stephen of SB Nation that the setback ?challenges? Crawford?s status for Opening Day, which is now very much in question.

Crawford played just 31 games last season and didn?t appear in a game for the Dodgers after coming over in the Adrian Gonzalez-led blockbuster trade/salary dump. He?s owed $20 million for this season and has more than $100 million remaining on his contract.

Source: http://hardballtalk.nbcsports.com/2013/03/01/carl-crawford-shut-down-with-forearm-tightness-status-for-opening-day-in-question/related/

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DirecTV acquires 4K trademarks | Advanced Television

By Chris Forrester

There?s no comment and absolutely nothing official but it seems that DirecTV, the US-based giant DTH broadcaster, is at least preparing for the introduction of something in Ultra-HDTV (or 4K for broadcast).

DirecTV has filed with the US Patent & Trademark Office a bunch of new applications in readiness for this new transmission method. The names registered include: 4K, 4KN, 4KNET, 4K Network and 4KNetwork.

Filing a trademark need only cost $149 a time (plus legal fees), so securing the terms seems a modest investment for what might be extremely valuable terms in a few years.

Source: http://advanced-television.com/2013/02/28/directv-acquires-4k-trademarks/?utm_source=rss&utm_medium=rss&utm_campaign=directv-acquires-4k-trademarks

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Dennis Tito plans to send couple to Mars and back

Multimillionaire space tourist Dennis Tito has established?Inspiration Mars?Foundation a nonprofit intended to organize a mission to Mars by 2017. The project's chief technical officer?Taber MacCallum dubbed this a no-frills, 'Lewis and Clark?trip to Mars'.

By Irene Klotz,?Reuters / February 27, 2013

The worlds first space tourist Dennis Tito (C) flies into the International Space Station, April 30, 2001. Tito has established a foundation intended to fund a two person mission to Mars in the near future.

REUTERS/Rtv

Enlarge

A nonprofit foundation wants to recruit a man and a woman - possibly a married couple - for a bare-bones, 501-day journey to Mars?and back that would start in less than five years, project organizers said on Wednesday.

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The mission, expected to cost upwards of $1 billion, would be privately financed by donations and sponsorships.

Project founder?Dennis Tito, a multimillionaire who in 2001 paid $20 million for a trip to the?International Space Station, said he will pay start-up costs for two years to begin development of life-support systems and other critical technologies.

Currently, there are no U.S. human spaceships in operation, but several are under development and expected to be flying by 2017.

That leaves little time to take advantage of a rare planetary alignment that would allow a craft to loop around Mars, coming as close as about 150 miles (241 kilometers) to the planet's surface, before returning to Earth.

The launch window for the mission opens on Jan. 5, 2018. The next opportunity is not until 2031.

"If we don't make 2018, we're going to have some competition in 2031," Tito told Reuters.

"By that time, there will be many others that will be reaching for this low-hanging fruit, and it really is low-hanging fruit," said Tito, who set up the nonprofit?Inspiration Mars?Foundation?to organize the mission.

Project chief technical officer?Taber MacCallum?said U.S. industry is up for the challenge.

"That's the kind of bold thing we used to be able to do," said MacCallum, who also oversees privately owned Paragon Space Development Corp.

"We've shirked away from risk. I think just seriously contemplating this mission recalibrates what we believe is a risk worth taking for?America," he said.

Tight quarters?

The spacecraft will be bare-bones, with about 600 cubic feet (17 cubic meters) of living space available for a two-person crew. Mission planners would like to fly a man and a woman, preferably a married couple who would be compatible during a long period of isolation.

The capsule would be outfitted with a life-support system similar to the one NASA uses on the space station, which recycles air, water, urine and perspiration.

"This is going to be a very austere mission. You don't necessarily have to follow all of NASA's guidelines for air quality and water quality. This is going to be a?Lewis and Clark?trip to Mars," MacCallum said, referring to the explorers who set out across the uncharted?American Northwest?in 1803.

If launch occurs on Jan. 5, 2018, the capsule would reach Mars?228 days later, loop around its far side and slingshot back toward Earth.

The return trip takes 273 days and ends with an unprecedented 31,764-mph (51,119-kph) slam into Earth's atmosphere.

Once the spaceship is on its way, there is no turning back.

"If something goes wrong, they're not coming back," MacCallum said.

The crew would spend much of their time maintaining their habitat, conducting science experiments and keeping in touch with people on Earth.

Tito said he expects the cost to be similar to a robotic mission to Mars. NASA's ongoing Curiosity rover mission cost $2.5 billion. A follow-on mission scheduled to launch in 2020 is expected to run $1.5 billion.

"You're really flying this mission without a propulsion system on the spacecraft. It's in the most simple form," Tito said.

NASA is working on its own heavy-lift rocket and Orion space capsule that could carry crews of four to an asteroid and eventually to Mars.

"We can just barely, every 15 years, fly by Mars?with the systems we have right now," MacCallum said. "We're trying to be a stepping-stone."

(Editing by Jane Sutton and Xavier Briand)

Source: http://rss.csmonitor.com/~r/feeds/science/~3/rKfWtILAk_g/Dennis-Tito-plans-to-send-couple-to-Mars-and-back

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