VISIT THE GREAT OUTDOORS, INDOORS PBS.org's "American Field Guide" houses more than 1,400 educational videos about America's wilderness and everything that affects it, from human impact to outer space (video lengths vary).
YOUTUBE PICK: WEB 2.0 . . . THE MACHINE IS US/ING US Now that that the world is full of wikis and a blog is born every half-second, we are not just using the Web: We are the Web. And that changes everything (4:31).
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