YouTube Subtracts Racy and Raucous to Add a Teaching Tool

The New York Times : Educators are giving YouTube — long dismissed as a storehouse of whimsical, time-wasting and occasionally distasteful videos — another look. As Google, YouTube’s parent company, fine-tunes a portal that lets schools limit students’ access to selected content, the video-sharing Web site is gaining popularity as a trove of free educational materials.

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