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Friday
Jan282005

VHS to DVD

http://www.nytimes.com/2005/01/27/technology/circuits/27stat.html?oref=login&position=&incamp=article_popular_2&oref=login&pagewanted=print&position=
STATE OF THE ART

Videotape to DVD, Made Easy

By DAVID POGUE

HOEVER said "technology marches on" must have been kidding. Technology doesn't march; it sprints, dashes and zooms.

That relentless pace renders our storage media obsolete with appalling speed:5?-inch floppies, Zip disks or whatever. And with the debut of each new storage format, millions of important files, photos, music and video have to be rescued from the last one.

At the moment, the most urgent conversion concerns videotape, whose signal begins to deteriorate in as little as 15 years. Rescuing tapes by copying them to fresh ones isn't an option, because you lose half the picture quality with each generation. You could play them into a computer for editing and DVD burning, but that's a months-long project. You could pay a company to transfer them to DVD, if you can stomach the cost and the possibility that something might happen to your precious tapes in the mail.

There is, fortunately, a safe, automated and relatively inexpensive solution to this problem: the combo VHS-DVD recorder. It looks like a VCR, but it can play or record both VHS tapes and blank DVD discs, and copy from one to the other, in either direction. Pressing a couple of buttons begins the process of copying a VHS tape to a DVD, with very little quality loss. (You can't duplicate copy-protected tapes or DVD's, of course; only tapes and discs you've recorded yourself.)

And if your movies are on some other format, like 8-millimeter cassettes, you can plug the old camcorder into the back of this machine, hit Play, and walk away as the video is transferred to a DVD.

(Of course, now you have to worry about the longevity of recordable DVD's. Fortunately, a DVD's movie files are stored as digital signals, not analog, so you won't lose any quality when you copy them onto whatever video format is popular in 2025. Video contact lenses, perhaps?)

As a bonus, a combo VCR-DVD player-recorder can eliminate one machine stacked under the TV, one remote control and, in most cases, one set of cables to your TV. (None of this makes it simple, however. All of these machines are far more complex than, say, a stand-alone DVD player.)

I sampled four of these combo boxes: the Panasonic DMR-E75V, the RCA DRC8300N, GoVideo's VR2940, and the JVC DR-MV1S. (Who makes up these model names, anyway - drunken Scrabble players?) All are available online for $285 to $350. As it turns out, shopping for a combo recorder is an exercise in compromise. Here are some of the trade-offs you have to look forward to.

JACKS Each recorder has a dazzling array of jacks on the front and back panels, for ease in connecting to your other home-entertainment gear. For example, each has so-called component video outputs for a superior picture on recent TV sets. JVC and GoVideo even included a front-panel FireWire input, which lets you dump footage from a digital camcorder directly onto a DVD.

Unfortunately, the GoVideo deck lacks an S-video input, a high-quality connection to many camcorder models. And a note to videophiles: The RCA, JVC and GoVideo decks can play both VCR and DVD signals through the same set of component video cables, so you don't have to switch TV inputs to get the best quality. DISC FORMAT Thanks to a foolhardy war between electronics companies, there are two incompatible formats for blank DVD's, confusingly called DVD-R and DVD+R. Recorded discs of either type will play in most recent DVD players, but you have to be careful to buy the right kind of blanks for your recorder, and many stores carry only one type.

The RCA and GoVideo decks require DVD+R (and their more expensive, erase-and-reuse variant, DVD+RW). The Panasonic and JVC players take DVD-R discs (and the erasable DVD-RW). A disc of either format must be "finalized" (a 2- to 15-minute electronic shrink-wrapping) before it will play in other DVD players.

As a bonus, the Panasonic and JVC models also accept a third format called DVD-RAM, which doesn't play in most everyday DVD players. But if you just leave it in your recorder, you can use it pretty much like a hard drive, adding and deleting recordings at will, slicing out commercials, watching the beginning of a show whose ending is still being recorded, and so on.

Frankly, understanding the differences between all of these formats makes most people's brains hurt. At the outset, you might want to consider just buying straight-ahead, ordinary blanks (either DVD-R or DVD+R) and treating them as burn-once-and-forget-it DVD's.

COPY QUALITY The quality of the copy depends on the speed setting you choose. The one- and two-hour DVD settings, for example, are nearly indistinguishable from the original VHS tape. Remember, of course, that VHS quality isn't so great to begin with. The four- to eight-hour modes look pretty terrible. The JVC and Panasonic decks also offer in-between settings that maximize quality based on the length of the recording, as long as you know the length ahead of time.

VCR FEATURES Only the JVC and Panasonic models offer VCR Plus+, the shortcut system that programs your recorder to record a show when you copy its code out of the newspaper TV listings. This feature applies to recordings made on either a tape or a disc, so a better name might be VCR Plus+ Plus DVD Plus+.

REMOTE CONTROL None of the remotes are fully illuminated, although the JVC's primary playback controls glow. Most require you to press a DVD or a VCR button before pressing Play, Pause or whatever; only the RCA is smart enough to play whatever is in the machine (a disc or a tape) - or, if one of each is inside, to ask which you want. The buttons on GoVideo's remote are especially poorly designed; they're all alike, all tiny, all the time.

DVD FEATURES All four of these decks work fine as DVD players, but the GoVideo's AutoPlay feature can skip all the ads, movie trailers, FBI warnings and so on at the beginning of a DVD movie, and just start playing the movie itself. DVDelicious!

Speaking of smart, the JVC, Panasonic and RCA decks offer a 30-second skip button that works on both discs and tapes; the JVC and RCA also offer a 7-second replay button that's great for catching mumbled dialogue.

CHAPTER MARKERS Each deck creates a new "chapter" of your DVD for each new recording you copy to it. But within a long recording, the Panasonic, RCA and JVC models just put a chapter marker every few minutes.

The GoVideo offers two more sophisticated features. One, an option called YesVideo, produces a handsome main menu featuring thumbnail images of the chapter breaks - an infinite improvement over the invisible markers of its rivals. (GoVideo's ads imply that these breaks are intelligently placed at scene breaks, but usually they're just spaced at regular intervals.) Better yet, if you pop the finished disc into a Windows PC, you can print out a DVD jewel-case insert depicting those thumbnail images, so you can see what's on the disc without having to put it into a player. Very cool.

YesVideo is available only if there's just one recording on a disc. Even without this feature, though, GoVideo still lets you place chapter markers manually during playback, complete with thumbnail images.

SUPPORT GoVideo should take pride in the fact that it prominently displays its toll-free tech-support number right on the box, part of what it calls its "widely heralded White Glove Customer Care."

It should be ashamed, however, of the fact that White Glove Customer Care turns out to be keeping you on hold for an hour, waiting for an agent - until a recording tells you that everyone's busy and hangs up on you. I never did get through.

Panasonic's player has a jaw-dropping list of features, including an amazing one-minute full-tape rewind speed, picture-in-picture, and so on - but its manual reads like a bad translation of the Japanese income-tax form. (Writing sample: "The title is irretrievably erased when you use this procedure and cannot be retrieved.")

On the other hand, RCA's manual offers standard high-school English-class writing - which means that, among electronics manuals, it's practically Shakespeare.

MAKING A CHOICE The GoVideo is the least expensive deck ($285 at shopping.com), its DVD preview-skipping feature is almost irresistible, and that YesVideo chapter thumbnail thing is a worthy exclusive. Its reliability is worrisome, though. My review unit froze several times during testing, and after a few days refused to burn any more DVD's. A replacement unit occasionally stopped burning discs until it was unplugged and plugged in again, earning it the household nickname Don'tGoVideo.(GoVideo's buyer reviews online are similarly discouraging.) The RCA ($346) and Panasonic ($342) are fine machines, but they can't touch the JVC ($312) for good looks, price or genuinely useful features. For example, only the JVC has two tuners, so that it can record two things at once (one on tape, one on DVD). And only JVC offers an infrared blaster (when you send in your registration card), which changes the channel on your cable or satellite box for a scheduled recording. VCR Plus+, a full complement of jacks and the glowing remote only sweeten the deal.

In any case, the arrival of the combo VCR-DVD recorder is a welcome moment in format-turnover history. Now all we need is an equally automated machine that rescues our vinyl records, Apple II floppies and 8-track tapes.

E-mail: Pogue@nytimes.com
Thursday
Jan272005

PC Migration

PC Migration Needn't Be a Tortured Trek
http://www.law.com/jsp/ltn/pubArticleLTN.jsp?id=1105968951117


Alohabob's PC Relocator and PC Backup ease the pain of replacing systems

By Joel B. Rothman
Legal Tech Newsletter
January 24, 2005


PC migration continues to be a huge struggle for law firms. We spend a significant amount of time and money installing software and configuring personal computers to our users' liking only to have to go through the process all over again when systems are replaced.

Considering that the average useful life of a personal computer is relatively short, losing the investment in set up each time a machine is replaced is a major loss. If only there was a way to avoid having to expend that same effort later on when your old computer is replaced.

The files and settings transfer wizard built into Windows XP is one option, but an extremely limited one since it will not transfer programs, and only works on machines running the latest versions of Windows.

Do you know where all of your application CDs are? Any routine setup of a new computer application will have to be installed from scratch from these CDs. Do you have all the service packs, updates and patches for your software applications handy? A full migration to a new computer would require you to install these as well.

What about utilities you downloaded from the Internet? Do you still have the installation files or will you need to go out on the Web and download these again? Of course, when you reinstall these applications you might need your original installation keys. Do you have these handy?

What about the dinosaurs in your office running Windows 98? How much time and effort will it take for you to get all their programs, files and settings up and running when the new Windows XP machine finally arrives?

Good PC migration software provides the ability to transfer all the applications, files and settings from your old computer to your new one regardless of the hardware configurations or operating systems of each. Rather than having to start from scratch when configuring a new computer, PC migration software speeds the process and provides the ability to transfer programs, files and settings from your old machine to your new one so the new computer looks, feels and functions just like that old clunker you were used to.

A COMPLETE MIGRATION SOLUTION

A migration where only personal files and Internet settings are transferred is an incomplete migration. Since I began using PC Relocator it has completely altered the way PC migration is done at my firm and for the better. PC Relocator allows you to transfer not only files and settings, but entire applications in their complete and updated state to your new computer with the same or a higher version of an installed operating system.

I have used PC Relocator several times to migrate systems from one computer to another with excellent success. PC Relocator starts by scanning your old computer, which it calls the source computer, to determine what may be transferred successfully. It then gives you a report on applications it expects to transfer successfully, ones that are questionable, and ones that cannot be transferred at all.

You then run PC Relocator on the new machine -- called the target computer -- and connect the two together. Connecting the source computer to the target computer can be accomplished in a variety of different ways. The most straightforward is a direct cable connection between the old machine and the new machine. This can be done with the USB transfer cable (included in PC Relocator Ultra Control), the PC-to-PC parallel transfer cable (included in PC Relocator) or an Ethernet crossover patch cable.

Best of all migration can be easily done across a local area network if both the old and new machines are hooked up to the same LAN, either wired or wirelessly. When you start PC Relocator it will scan your network to find other machines also running PC Relocator and identifies them by IP address. This allows you to perform the entire migration without ever leaving your desk. It also allows you to perform successive migrations to a number of different machines on your network.

I have yet to encounter a critical application that PC Relocator could not transfer. Popular applications like Microsoft Office, Adobe Acrobat and Corel WordPerfect are easily transferred from one machine to another with all users settings and files intact and in their most up to date state.

PC Relocator will work regardless of the hardware configuration of the new machine or the version of the windows operating system running on your new computer, however application migration must occur between the same or higher version of operating system. PC Relocator does this using patented technology that not only transfers files and settings from the old computer to the new, but also merges registry settings so that the program will operate flawlessly despite the difference in configuration between the two machines.

I have used PC Relocator to upgrade about half a dozen computers in my office and at home in the last 6 months. The old machines ran a variety of different flavors of Windows including Windows 98 SE, Windows 2000 and Windows XP. The new computers ran either Windows 2000 or Windows XP. In each case PC Relocator was able to distinguish between the differences in the two operating systems and transfer files, settings and applications without incident.

After your migration is complete you should find that most applications will initialize properly in their new environment. Some applications however, like Microsoft Office for instance, will require you to either insert the CD Rom containing program files when you first start the application after migration, or register the application on line. This is most likely the result of steps Microsoft has taken to prevent licensing violations since one could, theoretically, transfer applications to multiple computers for which the user does not possess a license.

I do not blame Microsoft for taking steps to protect its licensing rights. Moreover, since simply providing a CD Rom of Office after migration is incidentally easier and less time consuming that reinstalling and reconfiguring Office, I am happy to do it. This is a small price to pay for eliminating the huge headache of performing a migration manually from scratch.

A BETTER MIGRATION AND A BETTER BACKUP

PC Relocator also provides you the option of creating a migration file saved to a hard disk for use in performing one or more migrations at a later date on a computer not connected to the source machine.

This feature is handy if you have a stock desktop configuration for a number of PCs in your office and you want to transfer application files and settings to a variety of different computers with different operating systems or different hardware.

This particular piece of technology has been put to good use in Eisenworld's new product PC Backup. Like PC Relocator, PC Backup guides the user through an easy to use interface that lets you choose by category the types of files and programs to backup. For example, if you want to make a backup of just your word processing files, you can simply make this choice from the PC Backup menu without having to choose and copy each file individually. The program will find all such files and back them up to a network drive, an external hard drive, or even burn them onto CD-Rom for you.

Eisenworld offers several versions of PC Relocator, including an enterprise version that allows you to perform multiple migrations across an entire network of computers firm wide. A full working trial version of PC Relocator is available, so you can try it out before you buy it to make sure that the next migration will be easier than your last.

Joel B. Rothman is a member of Legal Tech's Board of Editors and a technology and intellectual property lawyer at Rutherford Mulhall, P.A. in Boca Raton, Fla.

Wednesday
Jan262005

Microsoft: Legit Windows or no updates

Microsoft: Legit Windows or no updates

By Ina Fried
URL: http://news.zdnet.com/2100-1009_22-5550205.html


Aiming to crack down on counterfeit software, Microsoft plans later this year to require customers to verify that their copy of Windows is genuine before downloading security patches and other add-ons to the operating system.

Since last fall the company has been testing a tool that can check whether a particular version of Windows is legitimate, but until now the checks have been voluntary. Starting Feb. 7, the verification will be mandatory for many downloads for people in three countries: China, Norway and the Czech Republic.

In those countries, people whose copies are found not to be legitimate can get a discount on a genuine copy of Windows, though the price varies from $10 to $150 depending on the country.

By the middle of this year, Microsoft will make the verification mandatory in all countries for both add-on features to Windows as well as for all OS updates, including security patches. Microsoft will continue to allow all people to get Windows updates by turning on the Automatic Update feature within Windows. By doing so, Microsoft hopes it has struck a balance between promoting security and ensuring that people buy genuine versions of Windows.

"We think that the best foundation for the most secure system is genuine software," said David Lazar, director of the Genuine Windows program at Microsoft. "We want to urge all of our customers to use genuine software. (At the same time), we want to make sure that we don't do anything to reduce the likelihood that a user will keep their system up to date."

The program, known as Windows Genuine Advantage, also offers perks to those who verify their copy of Windows. Those who do can get free software as well as discounts on other Microsoft products and services. Microsoft is upping the ante a bit, adding some additional discounts on MSN Games as well as on the company's recently announced Outlook Live subscription service to the existing list of benefits, which includes free access to the company's Photo Story 3 program.

Customers do appear to be interested in double-checking the status of their operating system. Some 8 million people have been asked to participate in the program since testing began, and more than 5 million have taken part.

And those numbers have come with very little recruiting on the part of Microsoft, Lazar said.

"More and more we will be marketing the offers to broaden the participation," he said. "People do like free stuff."

Piracy is a major problem for Microsoft and others in the software industry. One software industry study estimated that more than a third of software is pirated, costing the industry $29 billion a year. Microsoft won't put an exact figure on its losses, but said it is certainly in the billions over the past 10 years.

The validation effort is just part of Microsoft's threefold program, which focuses on educating users, engineering products in ways that minimize piracy, and enforcement through the legal system.

As for the added security risk, Directions on Microsoft analyst Michael Cherry said that people are putting too much of the blame on the software maker.

Cherry said it is not necessarily Microsoft's responsibility to protect people who aren't paying the company for its products. He likened the situation to buying a fake Rolex and then expecting warranty service if the product breaks.

The problem with that analogy, Cherry acknowledged, is that a broken Rolex doesn't put other watch owners at risk, whereas vulnerable computers connected to the Internet threaten all PC users. However, Cherry said that many of the computers that are at risk are using genuine, but older versions of Windows.

"There's a growing chance that the people whose machines are being taken over are running older systems which aren't really securable," he said.

Cherry said he thinks the company is acting appropriately, noting that making sure people are running genuine Windows is important for all customers.

"I think they are entitled to do this, and I think it is in customers' best interest to know that they have a genuine version of the software," he said. Counterfeit copies could contain their own bugs or viruses, and there is no way to guarantee that security patches will work, even if the user can download them, he said.

While Microsoft is the obvious beneficiary if piracy rates go down, Cherry said programs like Genuine Advantage also help level the playing field for smaller computer builders who play by the rules and find themselves undercut by dealers offering PCs with bogus copies of Windows.

"Those are the people I hope the program is helping," Cherry said.
Sunday
Jan232005

Stamp Collecting in an E-Mail Age


http://www.nytimes.com/2005/01/20/technology/circuits/20stam.html?ei=5088&en=e76aef043367c7e7&ex=1264050000&partner=rssnyt&pagewanted=all&position=

January 20, 2005

Stamp Collecting in an E-Mail Age

By SANDEEP JUNNARKAR

IVING along a remote stretch of Northern California's redwood coast, Oliver Seeler painstakingly tracks down stamps from around the world. But not just any stamps. He collects only those with images of bagpipes.

Mr. Seeler, the 60-year-old chief of the Albion-Little River Volunteer Fire Department, came to his hobby through his work selling bagpipes and bagpipe music. Pursuing such a niche might once have required a trip to a collectors' convention, or a chance find at a shop or show. Now, he uses auction sites, catalogs and other Web resources to identify stamps that can augment his collection, which he showcases online.

"The stamps are often difficult to find even after you have identified them," he said. "If you had to track them down by phone or by mail, it would just be prohibitive in terms of time and money."

After five years, his collection numbers 148 stamps, and has inspired a friendly rivalry. A little over a year ago, he received an e-mail message from a 41-year-old piper in Yorkshire, Sean Stewart, who had found Mr. Seeler's site and informed him about a bagpipe stamp from New Zealand that he had once seen. Their e-mail exchanges about finding that stamp transformed Mr. Stewart into an avid collector.

"Now we communicate almost daily. We are always on the hunt for stamps," said Mr. Seeler, adding that their e-mail correspondence now numbers nearly 800 messages. "We compete with each other to see who can come up with the next bagpipe stamp." (At the moment, Mr. Stewart has 218 of the 240 bagpipe stamps that they have identified.)

Mr. Seeler and Mr. Stewart's intercontinental rivalry represents just one facet of how stamp collecting has adapted to the rise of the Internet. Many enthusiasts worry that the pastime may slowly fade in the blare of video games, satellite television and iPods. But for all its emphasis on paper, ink and glue, stamp collecting has found new life in the digital age.

The hobby's online dimension is striking because most collectors are from an older generation less familiar with computers and the Internet. Still, the lure of meeting other stamp collectors, locating that one elusive stamp for a collection, or showcasing entire collections has drawn many onto the Web.

Linn's Stamp News, a weekly publication for collectors, found that 44 percent of its subscribers used computers for their collecting last year, compared with 34 percent in 1996. (And the average age of its readers last year was 65.8.)

An unintended result of displaying stamps on the Internet is the creation of galleries by individual collectors to help document and preserve the images and history of stamps. There are hundreds of exhibits broken down by themes, like stamps of birds, or by region or period.

Many philatelists say they would never see the collections were they not displayed on the Web. "Some of the stamps on my Web site are quite valuable," said Ross Taylor, a collector of Victorian stamps who lives on the outskirts of London and maintains a site at imagesoftheworld.org/stamps/stamps.htm. "The stamps are in the bank - and before, I could not even view them unless I took them out of the bank."

While traditional places for collectors, like conventions and stamp shops, still exist, stamp clubs on the Internet are proliferating.

"Basically, you were on your own," said Lloyd A. de Vries, president of a site for enthusiasts, the Virtual Stamp Club (virtualstampclub.com), and secretary of the American Philatelic Society, the nation's largest stamp collecting organization. "I think stamp collecting is growing because in effect we've all suddenly discovered that there are more people like us out there to talk to."

Also gone are the days of cataloging a collection in a tattered spiral notebook. Specialized database software like Stamp Keeper Deluxe, Stamp Collector's Data Base and StampCAT allows philatelists to track their inventory. Some collectors simply turn to commercial databases or spreadsheet applications.

One great challenge for collectors is to identify the lineage of a stamp. Which historical painting was it based on? When was it released, and in what quantity? What variations of the stamp exist, either in denomination or in size? The Web has transformed this arduous research task into one that is usually far more manageable.

"People post images of their stamps and ask others for help to identify the history of a particular stamp," said William F. Sharpe, the secretary of the Philatelic Computing Study Group (pcsg.org), an association dedicated to improving the hobby through computer use. "Newsgroups are another way to gather this information."

Stamp dealers also digitize their collections and post the images online or provide catalogs on CD's. But collectors often have to search each dealer's Web site for a particular stamp, making it a time-consuming process.

Some entrepreneurs, however, are creating searchable databases that include the inventory of as many dealers as are willing to pay to be included. Such portals include Zillions of Stamps, PostBeeld and StampFinder. Online auctions are increasingly important for buying and selling stamps. While there are many sites that specialize in collectibles, eBay is by far the largest source for stamps, according to stamp enthusiasts.

"EBay and its auction cousins are really increasing the number of people collecting stamps," Mr. de Vries said. At any given time, there are 40,000 to 50,000 lots of stamps on eBay alone, by the estimate of several collectors interviewed.

In Mr. Seeler's bagpipe quest, eBay, including its German and French sites, is a primary source for acquisitions - for which he pays $1 to $80, often buying an entire lot for a single bagpipe stamp within it. Mr. Seeler then scans each new stamp and posts the image to his expanding Web gallery (hotpipes.com/stsmain.html), part of a site he maintains on bagpipes and their history.

The stamps available on eBay range from garden varieties to rarities in the $6,000 range. Watchers of stamp auctions note that they have seen some available for as much as $35,000.

Buyers can also take a chance by bidding on grab bags that contain hundreds of stamps in see-through garbage bags or cartons. These lots are often sold by the pound. Potential buyers have no idea how much the contents are worth, but hope to find a gem that allows them to double or triple their investment. On Friday afternoon, one grab bag sold for $975 after 23 people bid on it.

But buying stamps online - especially through auction sites - can be risky. Consumer advocates warn that with stamps, unlike with other valuables, fraud artists need few special tools or skills. Counterfeiting a valuable coin takes special tools and dies; reproducing a painting requires a skilled artist.

"In other words, entrance requirements are steep - not in stamps," said George Kopecky, co-founder of Stamp Collectors Against Dodgy Sellers (scads.org), a site that regularly exposes fraudulent auctioneers and dealers on the Internet. "There are many things you can do to stamps to make them look like other much more valuable ones with as little as a pair of scissors."

A knowledgeable con artist can increase the value of a stamp with a few cosmetic changes. One common ruse is to clean up a used stamp to make it appear new, a step that may drastically increase its value.

When investigators at Scads are suspicious of a seller on eBay, they refer to the seller's eBay ID to examine the person's buying record, comparing the digital images of the stamps he bought to the ones he is selling.

"The Internet, particularly eBay, has been a boon for collectors knowledgeable enough to spot these frauds," Mr. Kopecky said. "However, the average collector is not skilled enough to know when they're being taken."

Stamp fraud predates the Internet, of course. The main difference now is how quickly con artists can move a large volume of altered stamps over the Internet compared with earlier times.

Connoisseurs can also pull a fast one on neophytes who sell stamps without realizing their value. People troll for such bargains on the Internet. "There's a bit of greed involved in the buyer - like I can pull one over on the seller because he does not know what he has and I do," Mr. Kopecky said.

It is not the fear of being hoodwinked, however, that keeps a small group of old-timers from tapping the power of the Internet for stamp collecting. This group fundamentally believes that stamp collectors should use the postal system to communicate with one another and to buy and sell stamps.

"My feeling is that today people want instant gratification," said Estelle A. Buccino, a 71-year-old collector from Bethesda, Md. "When you have to wait to hear back from dealers or people you want to trade stamps with, that is delayed gratification."

People like Mrs. Buccino acknowledge that the Internet has enhanced stamp collecting over all and that they are among the holdouts. "It doesn't bother me," she said. "I see stamp collecting as being part of a larger social pastime. There is a pleasure in seeking stamps the old way."

The new ways are evolving. One idea that recently percolated across the Internet called for people to collect, trade and sell not the physical stamps but their digital images. With many rare stamps costing thousands of dollars, collecting digital images presented a low-cost alternative.

That proposal got little response, but a variation is slowly catching on. Mr. Taylor says he posts some images of Victorian stamps taken by permission from dealers to fill in the blanks in his collection.

Other collectors keep a digital image to remind them of a stamp they badly want for their collection, a stamp they could perhaps never afford.

"I am never going to afford the $5 Columbian," a rare United States issue from 1893, said Mr. de Vries, noting that it can cost thousands of dollars. "But I can have a tie with the image of it, so why not have a digital image?"

Sunday
Jan232005

Exercise! Does running burn more calories than walking?

Exercise! Does running burn more calories than walking?

21-Jan-2005

Dear Cecil:

I'm a runner, and I'm always having to take grief from people (especially my wife) who happily point out that you'll get the same benefit walking three miles as you will running the same distance, and you won't risk crippling arthritis of all your major body parts. So the other day I had a flash! Going back to high school auto mechanics and some hot-rod magazines, I explained to my wife that since I'm exerting the same force to move the same mass the same distance, I'm doing the same amount of work--but since I'm doing it twice as fast, I'm exerting two times the power and probably using twice the calories. My wife is pretty bright, though: she pointed out that if I run and exert twice the power in half the time, and then sit on my butt desperately trying to catch my breath for the other half of the time, then average power exerted is a wash. Is she right? Does running have any calorie advantage over walking, or am I really being that dumb (not like it would be the first time)? --Peter Prout, Winchester, Virginia

Cecil replies:

A complicated question, often answered wrong even by those who ought to know. We'll take it by steps:

1. The unschooled view, which springs from the ancient instinct that pain = gain, is that running is better than walking because afterward you're sweating like a horse and gasping for breath.

2. Those with a semester or two of physics under their belts, on the other hand, reason that since the amount of work involved is the same, running a mile has the same impact as walking an equal distance.

3. However, this assumes that running and walking are equally efficient means of locomotion. Generally speaking they're not--running requires substantially more energy per unit of distance. Several factors contribute to this. Shall we start with entropy and the second law of thermodynamics? Eh, maybe not. How about aerodynamic drag, which increases with the square of the speed? Probably not something you need to worry about unless you've really been hitting the steroids. Here's something a little more relevant: Analyses of the biomechanics of walking vs. running suggest that walking is a more efficient gait except at higher speeds. The crossover point is somewhere around 5 mph, varying with the individual. At that speed, walking and running are equally efficient. Below the crossover point, running is less efficient, apparently because you lose energy absorbing the impact of the ground with your bent knees. Above it, walking falls behind because of the awkwardness of the racewalking gait. Gait is the critical issue, incidentally--running speed is irrelevant. Subtracting out the energy required just to keep you breathing, you'll use about the same amount of juice finishing the marathon in two hours or four.

4. To return to our main point, running consumes more calories per unit of distance than walking. For a person who weighs 70 kilograms (about 154 pounds), walking at 5 kilometers per hour (3.1 miles per hour) consumes 50 calories per kilometer, whereas running at 10 kph (6.2 mph) consumes 78 calories per kilometer.

5. Aha, you say, running is better than walking! Not necessarily, even if we narrowly define "better" as "consumes more calories." When you begin a workout your body is metabolizing carbohydrates, but as the minutes tick by you start burning fat--at minute 50 of light exercise, you're chugging along on a 75/25 fat/carb mix. Sixty percent of your maximum aerobic capacity (reached at roughly 75 percent of maximal heart rate, which is generally calculated as 220 minus your age) is optimal for fat burning; as exercise becomes increasingly strenuous you start burning more carbs. Some have seized on these facts to claim that sustained low- to moderate-intensity exercise is a better way to shed flab than going all out. The point is hotly disputed; I merely note that for the significantly overweight, walking can be easier on the heart, joints, etc.

6. At any rate, calorie consumption isn't the chief goal of exercise; cardiovascular fitness is. The American College of Sports Medicine says you should exercise three to five times a week in 20- to 60-minute sessions intense enough to raise your pulse to between 60 and 90 percent of your maximal heart rate. Such exercise should be aerobic, meaning something like running, brisk walking, biking, swimming, or cross-country skiing, as opposed to, say, weight training. Is running better than walking for this purpose? Depends. Running is certainly more of a workout per unit of time, but if your idea is that 15 minutes of running equals 30 minutes of walking, forget it--sustained exertion is the key. Then again, while any exercise is better than none, if your wife thinks a no-sweat half-hour amble around the neighborhood is the equivalent of your three-mile run, she's kidding herself too.

--CECIL ADAMS