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How do you know that the sender of an e-mail that has landed in your inbox is trying to steal your money or your identity? The message comes right out and asks for it.

Tax season means computer criminals are going to be out in force, pumping out bogus e-mails that purport to be from the Internal Revenue Service. These messages ask you to supply personal information in all kinds of scams. Often the scam e-mails offer help speeding up the preparation of tax returns or securing a big refund.

The e-mails also might just be a cover for criminals to install malicious software on your computers, by tricking you into opening attachments or visiting poisoned Web sites.

Scam e-mails can be stunningly convincing, so you often can't tell just by looking at them whether they're real or fake. They can use authentic-looking IRS logos and even e-mail addresses: Scammers can make it appear as if they're writing from a legitimate government e-mail address, so you can't trust the "from" line in e-mails you receive.

So what should you do to protect yourself?

Don't supply your personal information, such as Social Security numbers or credit card numbers, to anyone e-mailing you for it. The e-mails might state that they just need a few pieces of personal information to get started. The IRS doesn't discuss tax matters with people by e-mail.

Also, don't open attachments or follow links in unsolicited e-mails. When it comes to computer security, if someone's offering you something online that you didn't ask for, chances are you probably don't want it.

Using your cell phone during checkout at Target could soon earn you discounts.

Starting Wednesday, the giant retailer will allow customers to take advantage of special mobile-coupon offers on their handsets.

The coupon is redeemed when the bar code on the phone is scanned at checkout. Offers are good only once and expire on the dates listed. "We believe it's a competitive advantage for us," says Target.com President Steve Eastman.

Target says it will be the first major nationwide retailer to exploit the bar-code technology in all its stores. It almost certainly won't be the last.

For example, J.C. Penney is testing similar scanner-based technology at 16 point-of-sale registers in Houston. But at the rest of its stores, checkout clerks still must manually enter alphanumeric codes tied to discount coupons, rather than using scanners.

Scanning bar codes makes the process faster and easier, says Dan Kihanya, vice president of consumer marketing at Cellfire, the mobile-coupon company working with J.C. Penney on its Houston tests. "Any time you have data entry, you have to worry about errors."

Mobile coupons, while not new, are still in their relative infancy. "It's an area ripe for growth," says ABI Research analyst Neil Strother. Not everyone clips coupons, virtually or otherwise. But most people crave a bargain when the economy is tough. And coupon technology works with more and more cell phones.

U.K.-based Juniper Research recently forecast that more than 1-in-10 mobile subscribers in developed regions around the world will use mobile coupons by 2014, generating nearly $6 billion in redemption value.

Kihanya of Cellfire says mobile coupons are redeemed at a 5% to 20% rate, compared with about 1% for print coupons. Cellfire does much of its business with grocery chains, such as Kroger and Safeway.

Shoppers interested in Target's program must "opt in" by registering at the company's online or mobile Web...

When you recycle a plastic bottle, it doesn't necessarily become another plastic bottle.

Because of limitations in recycling technology, a common type of plastic used in water bottles and food containers weakens so much when it's recycled that it can't be used again for the same purpose. Some small amount of the plastic might make it into another bottle, but more often than not, it instead becomes synthetic carpet or clothing and can't easily be recycled a second time. So when those products are used up, they end up in landfills.

Researchers from IBM Corp. and Stanford University believe they have developed a way to significantly improve the quality of recycled plastic and strip away those limitations.

A new recycling method the researchers are announcing Tuesday involves a way to break the plastic down so that it can be reused again and again in the same form. It is an advancement that could intrigue beverage companies and help cut the environmental damage from making plastic from scratch.

The innovation is a new family of catalysts that can reduce polyethylene terephthalate (PET) plastic to its basic building blocks, while retaining its original properties and making it "ridiculously economical" to build it back up again, said Bob Allen, senior manager of chemistry and functional materials for IBM's Almaden research center in Silicon Valley.

The project is in the laboratory on a small scale. Researchers are planning a bigger pilot at the King Abdul Aziz City for Science and Technology, home to Saudi Arabia's national laboratories. Allen said the technology could be commercially available within five years if the pilot goes well.

A critical question will be the price of the technology.

Andrew Williamson, a director with the venture capital firm Physic Ventures who has seen IBM's research, said it could help solve one of the biggest challenges facing food...

#wanttospinWHreporters?

If you're PressSec -- White House press secretary Robert Gibbs' username on Twitter -- you join the powerful social media platform and push your message across the Internet, 140 characters at a time.

Blending behind-the-scenes nuggets with a defense of President Barack Obama's record, White House and administration officials increasingly are communicating through Twitter.

The popular social network is operating as a Web-based clearinghouse for public statements on weighty subjects (the federal budget) and the mundane (personal grocery lists). It's similar to a bulletin board where anyone can post short notes and users cull the pieces they see by choosing to "follow" individuals' account.

Forget press releases. Gibbs and his deputy, Bill Burton, are now sharing news in Twitter messages. So far 35,000 people have signed up to follow Gibbs and more than 6,000 are tracking Burton. Those two officials have a ways to go to catch actor Ashton Kutcher and his 4.6 million followers.

"Wow unreal game... POTUS watched OT in his office right off the Oval Office -- all of us are so proud of our great team," Gibbs tweeted during the men's Olympic hockey finals last Sunday, when the Americans lost the gold medal game to Canada in overtime. POTUS, of course, is the acronym for president of the United States.

Burton offered a midgame, inside-the-Beltway joke: "Tied! White House response, on bgnd, from a low- to midlevel administration official: USA! USA! USA!" (He was referring to a favorite administration request when talking to the press "on background" means the official won't be identified publicly.) After the U.S. loss, Burton noted that America still led the overall medal race.

These are hardly the pronouncements one expects from the president's top spokesmen. But as Obama's team continues an online strategy set in place during the campaign and imported to Pennsylvania Avenue, it seems only...

Facebook may join other Internet companies in offering location-based services. The social-networking site plans to let its users to share their location and see the locations of friends, according to published reports.

Facebook could use the service to provide advertisers with targeted information such as the nearest ATM. The feature is expected to be similar to Foursquare, a location-based social network that enables users to "check in" with one another and meet up.

Some Internet users have accepted location services as a way to gain information they feel is valuable, such as a coupon for a nearby restaurant or personalized weather services. But others fear it's another example of Big Brother watching and, in this case, knowing where they are.

User Control

Facebook has been working on the feature for more than a year and is expected to make it available to its millions of users, reports say. The company also plans to provide application programming interfaces to third-party developers who want to add location features to their Facebook applications.

The company is tight-lipped about the service. "We are constantly experimenting with new ideas and products internally," said Meredith Chin, a Facebook spokesperson, in an e-mail. "We don't have anything more to share at this time."

Facebook may want to announce the feature at its F8 Conference next month.

U.S. companies offering location-based services must comply with the CAN-SPAM Act, which requires users' consent. Under the 2003 act, companies have given users control of location services on web sites and in mobile apps.

In Europe, the European Union has taken steps to protect users from information gathered through location-based services.

Some companies have taken extra steps by adding privacy-enhancing technologies.

The Rummble Example

Companies hoping to give advertisers ways to target audiences have been implementing location-based services for some time. Rummble, a location-based social network,...

With the stakes high in Microsoft's bid to add its search engine to the iPhone, a few words of praise by the software giant's CEO have drawn a considerable amount of attention.

"Apple's done a very nice job that allows people to monetize and commercialize their intellectual property" in the App Store, Microsoft CEO Steve Ballmer told a University of Washington audience last week.

Playing Bing-o

Although Ballmer was stating the obvious, observers and analysts quickly surmised that he was trying to sweeten the waters in advance of Apple's decision on whether to replace Google with Microsoft's Bing as the default search engine on the iPhone operating system.

Business Week reported in January that the two giants were in negotiations for that deal. Asked by Reuters about the prospects after unveiling the Windows 7 Phone Series last month, Ballmer said, "I hear the same rumors you do."

The App Store has more than 130,000 products for sale or free, fueling the sale of iPods and iPhones and creating a user experience that other smartphone manufacturers have tried to emulate. Microsoft's Windows Marketplace for Mobile has less than 1,000 apps.

No Denying It

"It would appear that Microsoft is no longer in denial about what Apple has accomplished," said Michael Gartenberg of the Altimeter Group, a technology consulting firm. "The question is, will Microsoft be able to drive a wedge between Apple and Google and find a new and unlikely ally in the mobile space?"

As Ballmer praised the App Store, the Electronic Frontier Foundation (EFF), a San Francisco-based nonprofit, launched a broadside against Apple by publishing the company's 28-page developer licensing agreement on its web site.

Since NASA now has an iPhone app, the group cleverly filed a Freedom of Information Act request for the agreement that the government agency signed with Apple.

'Major Shift'

"The entire family of devices built...

Older versions of Internet Explorer are under attack. Microsoft warned Tuesday afternoon that cybercriminals are actively exploiting a security vulnerability that lets attackers execute malicious code from remote locations.

Microsoft's internal investigation reveals that the latest version of the browser, Internet Explorer 8, is not affected. Likewise, Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service Pack 4 is not affected.

Here's a quick list of affected versions for IT administrators looking to implement a workaround to mitigate the risk: Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4, and Internet Explorer 6 and Internet Explorer 7.

"In addition to Microsoft's Patch Tuesday updates today, the company also issued an advisory for a new zero-day vulnerability affecting Internet Explorer," said Josh Talbot, security intelligence manager for Symantec Security Response. "Symantec has observed exploitation of this vulnerability in the wild and has created Trojan.Malscript!html and JS.Downloader detection to mitigate this attack."

The Root of the Problem

Microsoft said the vulnerability exists due to an invalid pointer reference being used within Internet Explorer. Under certain conditions, it's possible for the invalid pointer to be accessed after an object is deleted, according to a March 9 Microsoft security advisory. In a specially-crafted attack, in attempting to access a freed object, Internet Explorer can be caused to allow remote code execution.

"At this time, we are aware of targeted attacks attempting to use this vulnerability. We will continue to monitor the threat environment and update this advisory if this situation changes," Microsoft said. "On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through our monthly security update release process, or an out-of-cycle security update, depending on customer needs."

Mitigating Factors

IT administrators can take heart in the mitigating factors that may protect their...

The wait is over. Cisco Systems on Tuesday finally took the lid off its hype machine to reveal ... a new router. Cisco is positioning its CRS-3 Carrier Routing System as the foundation of the next-generation Internet that will pave the way for rapid growth of video transmissions, mobile devices, and new online services.

The CRS-3 offers three times the traffic capacity of the its predecessor, the CRS-1, Cisco said, and promises to accelerate the delivery of new experiences for consumers, new revenue opportunities for service providers, and new ways to collaborate in the workplace. That's a lot of hyperbole, but analysts said it's believable.

"It's too bad Cisco led up to this router announcement with so much hype. People were expecting Armageddon or something. They had this countdown timer as if something big was going to happen," said Zeus Kerravala, a vice president at Yankee Group. "At the end of the day what Cisco announced was a big, fast router. But that's what Cisco does. We expect Cisco to release bigger, faster routers. It's what they built their company history on."

Lighting-Fast Router

The Cisco CRS-3 can handle up to 322 terabits per second. To put that speed into perspective, this router would allow the entire printed collection of the Library of Congress to be downloaded in just more than one second. Or every man, woman and child in China to make a video call -- simultaneously. And every motion picture ever created to be streamed in less than four minutes.

The Cisco CRS-3 makes possible unified service delivery of Internet and cloud services. A Network Positioning System provides layers three to seven application information for the best path to content. And a cloud virtual private network for Infrastructure as a Service lets customers "pay as you go" for computing, storage and network...

The students in Michael Dubson's physics class at the University of Colorado fell silent as a multiple choice question flashed on a screen, sending them scrambling for small white devices on their desks.

Within seconds, a monitor on Dubson's desk told him that 92 percent of the class had correctly answered the question on kinetic energy, a sign that they grasped the concept.

Clickers -- not unlike gadgets used on television game shows -- first appeared in college classrooms over a decade ago and have since spread to just about every college and university in the country thanks to cheaper and better technology.

But as clickers have become commonplace, a divide has emerged over just how sophisticated they should be.

Some professors like Dubson endorse simple, straightforward devices that stick to multiple choice questions. Others embrace fancier models or newer applications for smart phones and laptops that allow students to query the professor by text or e-mail during the lecture or conduct discussion with classmates -- without the cost of purchasing a clicker.

Those preferring simplicity say pared-down remotes reduce distractions in a multitasking world, while others say fighting the march to smart phones and digital tablets is a losing battle.

Clickers first gained popularity in large science lecture halls as a way of gauging whether students understood the material. They have since migrated into smaller classrooms and can be found in nursing and other professional schools. Even middle schools and high schools are using them.

Research at the college level has found that students like using the devices and attendance often goes up. But results are mixed when it comes to learning. Some evidence suggests clicker use has led to only modest gains in retention and test scores, while other studies have detected little or no improvement, according to a November article in the North American...

On the heels of the big 3-D television presence at the Consumer Electronics Show in January, Sony and Samsung are joining Panasonic, LG Electronics, and others in promoting the new technology. On Tuesday, Sony said it is aiming for 10 percent of its TV sales within the next year to be 3-D models, and Samsung announced a range of HDTV sets and Blu-ray players will ship later this month.

At a press conference Tuesday in New York City, Samsung announced what it described as the "world's first available full HD 3D LED TV," as well as a variety of related 3-D home entertainment products.

'World's First HDTV App Store'

Under a new promotion, buyers of a Samsung 3-D TV and 3-D Blu-ray player or home theater system will get a "3-D starter kit" with two pairs of 3-D glasses and a 3-D version of DreamWorks Animation's Monsters vs Aliens. The manufacturer also said it plans to make available a 3-D version of the studio's popular Shrek film series.

Samsung's 3-D offerings include 46- and 55-inch LED TVs being released this month, and others to be rolled out over the next several months. It also touted the 240-Hz refresh rate and Internet connectivity in the new models, as well as access to the "world's first HDTV app store," Samsung Apps.

On Wednesday, Panasonic will start selling its first 3-D TV in the U.S. in a partnership with Best Buy, while Samsung is also launching a 3-D TV and Blu-ray player offer with that retailer. LG said Tuesday it will begin offering its new 3-D sets in India.

Sony's first sales will be in June in Japan, and the company hasn't announced launch plans for the new products in the U.S. It has also said it will be releasing a software update for the PlayStation 3,...