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Quantum fluctuations in science, space and society, from quarks to Hubble and Mars. Served up by Alan Boyle, msnbc.com science editor. E-mail Alan, or connect via Facebook, Twitter or Google+.

Open source travel guide featuring up-to-date information on attractions, hotels, restaurants, travel tips and more. Free and reliable advice written by Wikitravellers from around the globe.

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

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National Geographic provides free maps, photos, videos and daily news stories, as well as articles and features about animals, the environment, cultures, history, world music, and travel.

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