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Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Princeton University is a vibrant community of scholarship and learning that stands in the nation's service and in the service of all nations.

Africa is the most amazing continent on the earth. Come explore some of the most interesting facts about this land rich in tradition and culture.

THE starting place for exploring Geography, from your About.com expert Guide to geography. Learn about all concepts of geography, find geographic information, maps, and more. Includes geographic information about every country and state as well as ...

NASA Quest is dedicated to bringing NASA people and science to classrooms through the internet. Space Team Online, Aerospace Team Online, Solar System Online, and Deep Space Online. NASA Quest is the ultimate resource for educators and kids intereste...

Because we only have the one planet Earth... WWF believes that, together, we must save endangered species, conserve natural environments and live sustainable lives.

TripAdvisor - Unbiased hotel reviews, photos and travel advice for hotels and vacations - Compare prices with just one click.

YouTube is a place to discover, watch, upload and share videos.

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontline, NOVA, PBS Newshour, Masterpiece and many others.

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

Selected as one of the "Best Adventure Travel Companies on Earth", offering hiking, trekking, sea kayaking, cultural, and safari tours.

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.