video-sharing Web site

When University of Central Florida junior Nicole Nissim got stumped in trigonometry, she checked out what was showing on YouTube.

Nissim typically scours the video-sharing Web site for clips of bands and comedy skits. But this time she wasn't there to procrastinate on her homework. It turned out YouTube was also full of math videos. After watching a couple, the psychology major says, she finally understood trig equations and how to make graphs.

Soldiers in the United States military received a welcome surprise on Tuesday as the nation celebrated Veteran's Day. Delve Networks, based in Seattle, along with Houston-based Marion Montgomery, a marketing and design firm, teamed to launch TroopTube, a video-sharing Web site developed solely for members of the military and their families.

YouTube, the popular video-sharing Web site, and its owner, Google, are being sued for allegedly distributing nearly 5,000 copies of programming owned by a Milan, Italy-based company.

After conducting a survey of videos on YouTube, Mediaset said it found 4,643 copies of its programming, equaling 325 hours of video, on the Web site.

Google has surpassed Yahoo to become the most popular Web site in the United States, according to comScore Inc.'s rankings by the number of unique monthly visitors.

Google Inc. has long been the Internet's leader in search, but its audience has trailed Yahoo Inc.'s when counting other services such as e-mail and photo sharing.

April's numbers, which Internet tracking firm comScore plans to formally release Thursday, show Google on top for the first time.