Conjoined twins is fusion, in which a fertilized egg completely separates, but stem cells (which search for similar cells) find similar stem cells on the other twin and fuse the twins together. Conjoined twins share a single common chorion, placenta, and amniotic sac, although these characteristics are not exclusive to conjoined twins, as there are some monozygotic but non-conjoined twins who also share these structures "in utero". The most famous pair of conjoined twins was Chang and Eng Bunker (Thai: อิน-จัน, In-Chan) (1811–1874), Thai brothers born in Siam, now Thailand. They traveled with P.T. Barnum's circus for many years and were labeled
The D'Ambrosio Twins The D'Ambrosio Twins Bianca D'Ambrosio and Chiara D'Ambrosio (born April 28, 2005), also known collectively as the D'Ambrosio Twins, are American child actresses and musicians. The twins made their acting debut playing Summer Newman on the soap opera "The Young and the Restless". At the age of 6, Bianca and Chiara began starring together and separately in TV, films, print, music, and video projects. The twins were born in Los Angeles, California. In 2008 at the age of 3, the twins were cast in the role of Summer Newman on the soap opera, "The Young and the Restless" on CBS.