How Long Does Mass Extinction Take? | Science| Smithsonian Magazine - discu.eu

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How Long Does Mass Extinction Take? http://www.smithsonianmag.com/science-nature/how-long-mass-extinction-180949711/ 50 comments 19/2/2014

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Air Pollution in China Is Spreading Across the Pacific to the U.S. | Science| Smithsonian Magazine http://www.smithsonianmag.com/science-nature/air-pollution-china-is-spreading-across-pacific-us-180949395/ 6 comments

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