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Dear EarthTalk : What is “tar sands oil” and what is the controversy over possibly building a pipeline for it from Canada into the United States?-- Bill Berkley, Omaha, Neb.

Today we saw land for the first time in days! Everyone was on deck together, untying the lines, taking photos and waving to the crew aboard a container ship that was docked in the marina. Stepping on land was wonderful, although I still feel like I’m swaying back and forth.

To what degree these and other differences originate in biology must be determined by research, not fatwa.

Editor's Note: The following blog post first appeared May 19 on the World Science Festival's Web site. Most people look for the key to postponing old age in mega-antioxidant-loaded juices, extreme exercise regimens, or expensive skin creams

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Key concepts Water cycle [More]

TOKYO, May 25 (Reuters) - Japanese engineers are trying togain control of the Fukushima Daiichi nuclear power plant, 240 [More]

By Richard A. [More]

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By Zach Howard BUCKLAND, Mass (Reuters) - White nose syndrome, a devastating disease that has killed more than one million bats in the Northeast, has been found in Maine, the last New England state to discover it, wildlife officials said on Tuesday. [More]

A network of citizen scientists across the U.S. who monitor plants as the seasons change [More]

BOSTON--Score one for the little guys. After years of obscurity in the corners of distant planetary systems smaller exoplanets are finally shuffling into the spotlight.

Gazelle have polygynous mating habits.

The tornado that plowed a wide swath of death and destruction through Joplin, Mo., on Sunday unleashed winds of up to 198 miles per hour, federal forecasters said yesterday. The National Oceanic and Atmospheric Administration's preliminary analysis ranks the twister as an F4, the second-highest rating on the five-point scale used to classify tornadoes. [More]

By Michael Holden and Omar Valdimarsson LONDON/REYKJAVIK (Reuters) - An ash cloud from a volcano on Iceland shut down flights in northern Britain and elsewhere in north Europe on Tuesday and was heading to Germany, but officials expected no repeat of last year's air chaos.