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The morning after, there's plenty to say about the results from New Hampshire, whether it's Republican John Kasich's surprising No. 2 finish or the "Bernie sandwich."

The viruses, spam and malware that have plagued desktop computers for years now increasingly threaten mobile smartphones, as well. More text messages now deliver scams and a growing number of malicious apps install spyware, target personal information and attempt to charge users hidden fees.

If Web users don't pay to search, how do search engines make money? In the third report in a five-part series about Internet search engines, NPR's Rick Karr traces the ways companies such as Google and Yahoo earn cash.

Search technology, once relegated to library science departments and remote corners of computer science labs, went mainstream with the Internet, spawning such once-giant brands as Lycos, AltaVista and Yahoo. These engines proved that the Web could be indexed, but they failed when it came to giving users what they wanted.

Apple Computer is expected to announce that its i-Tunes music downloading service will become available for users of Windows-based personal computers. Analysts say Apple should expect intense competition from similar services. Jason Lopez reports.

NPR's Chris Arnold reports on Liquid Audio. Unlike the free-music swapping Internet system, Liquid Audio was built to legally sell music for a profit. But Liquid Audio doesn't have as many songs as Napster. Meanwhile, Napster is facing its own restrictions, including legal battles, and a deal with a German company that could restrict what it can offer users in the future.

Robert Siegel talks with Bruce Schneier, author of Secrets and Lies: Digital Security in a Networked World. They discuss ways Napster might try to prevent users from making illegal copies of music available through its site. He says whatever technology Napster uses will be hackable, and once it's hacked, a program for getting around the technology could be made available almost instantly through the Internet.

NPR's Emily Harris reports on a software development company, Disappearing Inc., that's producing a program to create self-destructing e-mail messages. The life-span of the e-mail can be set by the user, and their automatic deletion can help to reduce the huge archives of e-mail that most companies amass.

The Supreme Court hears a case in which a Southern California Internet service provider wants cable TV providers to share their networks with other companies. This would give Internet cable users more choices.

A growing number of chronic pain sufferers are turning to so-called pain pacemakers -- devices implanted under the skin that block pain signals from reaching the brain. Users praise the device's effectiveness, but critics say it should only be used as a last resort. Hear NPR's Joe Shapiro.