03/03/10 In Geology, examination of Chicxulub impact crater sediments supports existing K-T mass extinction theories; Cretaceous nannofossils help clarify climate change; a debris flows study breaks up the sieve-lobe paradigm; Walter Alvarez and coauthor take a look back at the Copernican Revolution; microbial mats display evolutionary creativity through wax esters; and study of thermophilic microbes in ...

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