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•  Zermelo set theory

  Zermelo set theory, as set out in an important paper in 1908 by Ernst Zermelo, is the ancestor of modern set theory. It bears certain differences from its descendants, which are not always understood, and are frequently misquoted. This article sets out the original axioms, with the original text (translated into English) and original numbering.

  

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•  Paracheirodon

  Paracheirodon is a genus of freshwater fish in the characin family of order Characiformes. The type species is Paracheirodon innesi, the well-known neon tetra, and the Paracheirodon species are among the fishes known as tetras. All species of this genus are native to the Neotropic ecozone, occurring in several rivers and streams in northern South America. The Paracheirodon tetras reach maximum overall lengths of about 3 cm (1.25 in), and are of elongate tetra shape.

  

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•  RT-2PM Topol

  The RT-2PM Topol is a mobile intercontinental ballistic missile designed in the Soviet Union and in service with Russia's Strategic Rocket Forces.

  

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•  Peruvian Slaty-Antshrike

  

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