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Photo Journal: Miniature masterpieces

A picture of a Christmas tree created using diatoms, a type of algae, is seen in this photo. The work is by Osamu Oku, a former researcher and now a creator of scientific specimens, who released a book of his artistic creations, "Diatoms Art Museum," this month. Oku uses a custom-made tool while looking through a microscope to position the diatoms. (Photo courtesy of Osamu Oku)

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