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National Geographic is the source for photos, free desktop wallpapers of places, animals, nature, underwater, travel, and more, as well as tips and ph...

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Online version of the weekly magazine, with current articles, cartoons, blogs, audio, video, slide shows, an archive of articles and abstracts back to...

The American Radio Relay League (ARRL) is the national association for amateur radio, connecting to hams around the U.S. with news, information and re...

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

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History education is important. National History Day engages people in history by providing quality materials for history and social studies educators...