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Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessori...

A site for students, educators and anyone else interested in space and astronomy to learn about the wonders of our Universe.

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontlin...

Catholic Culture provides: Liturgical Year, Documents / Articles, Web Site Reviews, the Catechism, and more.

An internet library of journal articles, essays, book excerpts, and other texts chosen for their objective, concise, and clear presentation of Catholi...

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

Space and astronomy news

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

Twitter is without a doubt the best way to share and discover what is happening right now.

Eric Weisstein

International führender Wissenschaftsverlag - Wissenschaft, Technik, Medizin, Architektur, Wirtschaft und Verkehr - Zeitschriften, B&#252...