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Pseudo-cryptic speciation of calcifying algae (PNAS, June 10, 2003) Orb, human retinal scan, drosophila wings, and tree branches (© Patricia Olynyk) Fossil marine diatom, Actinoptychus heliopelta (900x) © Stephen S. Nagy Arctic ozone loss in volcanic stratosphere (PNAS, Mar. 5, 2002)

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