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
Brewer twins the World" by "People" magazine in 1998. They have worked with photographers such as Bruce Weber, Steven Meisel, Tiziano Magni, Claus Wickwrath, Randall Mesdon, Marko Realmonte and also with model Cindy Crawford. They have appeared on the covers of "Glamour", "Esquire", "Mizz", "Sassy", "Dolly", "Student Life", "Vogue", "Fortune" amongst others., They are also amateur surfers and snowboarders. In 2003 they moved in the insurance business and opened their own insurance agency in 2013 in Redondo Beach, CA. Brewer twins Derek and Keith Brewer, known as the Brewer Twins, are male models. The twins were born on September 21, 1973, at