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Spotted by ResearchBuzz , this site is both fun and useful : an A-Z index of difficult words , nearly 14,000 in all . This study does make two significant assumptions , namely that the compound is stable in water due to low ionic mobility of Sr , and that effective charge transfer to water can occur . The links are organized in more than a dozen sections , including basic readings ( co-written by Corsetti ) , emerging policy issues , a regularly updated daily chronology of events ( 1998-present ) , fiscal and monetary policy issues , official sources , economists ( with links to their publications ) , and debates . Evacuees from the hardest-hit portions of Alabama , Mississippi and Louisiana generally fall into four distinct types of households : previous homeowners , renters , individuals who lived in public housing , and those who were homeless prior to the hurricane . Due to the limited understanding of the Nb / Si optical systems , our research group fabricated and measured Nb / Si multilayers and Nb transmission filters for the soft x-ray and EUV regions .