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
Barbi Twins been searching for him since 2008. Their search remained ongoing as of 2014. Barbi Twins Shane and Sia Barbi (born April 2, 1963), popularly known as The Barbi Twins, are identical twins, cover models, co-authors, and spokespersons for animal rights advocacy. Shane and Sia began modeling at the age of seven when they posed for a layout in the Sears mail-order catalog. As adults, their career has included fashion and mainly pin-up modeling. The "Los Angeles Times" did a cover story about the Barbi Twins when their billboard went up on Sunset Boulevard in 1989 immediately catapulting them to worldwide