Masha and Dasha Krivoshlyapova
Encyclopedia
Masha and Dasha Krivoshlyapova (Мария & Даша Кривошляпова , Mariya & Dasha Krivoshlyapova) (officially with one birth certificate under the name "Dariya Krivoshlyapova") (3 January 1950 – 17 April 2003) were Russian conjoined twins
Conjoined twins
Conjoined twins are identical twins whose bodies are joined in utero. A rare phenomenon, the occurrence is estimated to range from 1 in 50,000 births to 1 in 100,000 births, with a somewhat higher incidence in Southwest Asia and Africa. Approximately half are stillborn, and a smaller fraction of...

 of the Ischiopagus tripus variety. They were removed from their mother's custody at birth (she was told they had died) and kept in an institution where they were the subjects of medical research and experimentation.
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