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Astronomy, geology, physics, sciences A-Z, includes current academic articles, images, multimedia, science-in-the-news, bios, topics for papers, and more. Updated regularly.

Biodiversity (updated regularly) includes evolution of biodiversity, systems for classifying and defining biodiversity, ecological patterns and theories of biodiversity, and an assessment of contemporary patterns and trends in biodiversity.

Encyclopedia of Microbiology Authoritative comprehensive articles on subjects in microbiology