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"561" a.k.a. "Fallen Angels" is a Prometheus Award-winning novel by science fiction authors Larry Niven, Jerry Pournelle, and Michael Flynn published by Jim Baen. The novel was written as a tribute to science fiction fandom, and includes many of its well-known figures, legends, and practices. It also champions modern technology and heaps scorn upon its critics - budget cutting politicians, fringe environmentalists and the forces of ignorance. An ebook of this text was among the first released by the Baen Free Library.


  1. 561 a.k.a. Escherichia is a genus of Gram-negative, nonspore forming, facultatively anaerobic, rod-shaped bacteria from the family Enterobacteriaceae. In those species which are inhabitants of the gastrointestinal tracts of warm-blooded animals, Escherichia species provide a portion of the microbially derived vitamin K for their hosts. A number of the species of Escherichia are pathogenic. The genus is named after Theodor Escherich, the discoverer of Escherichia coli.
    • also known as EŇ°erihija
  2. 561 a.k.a. The Savages is a British sitcom that aired on BBC One in 2001. Starring Geoffrey Palmer and comedian Marcus Brigstocke, it was written by Simon Nye, the writer of Men Behaving Badly.
  3. 561 a.k.a. Administrative and Support Services is an industry.
  4. 561 a.k.a. azoospermia factor 2 is a gene.
  5. 561 a.k.a. 2,3-Diketo-5-methylthio-1-phosphopentane is a chemical compound.
    • also known as 1-phosphoryloxy-2,3-diketo-5-methylthiopentane, 1-phospho-2,3-diketo-5-methylthiopentane
  6. 561 a.k.a. The Adventures of Robin Hood - Season 4 is a tv season.

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