Siamese twins
Twins, who accrete by their bodies in a parent womb, are called Siamese. This term is connected with the pair of Chinese twins that were born in 1811 in Thailand (then it was Siam). Boys (parents have named them Chang - “left” and Eng - “right”) accreted in the field of a solar plexus. They had common navel and liver. When they were young they worked as sellers and messengers. At the age of 18 they immigrated to the United States of America and began to go on tour with improbable success. They married sisters, gave birth to more than 20 children and died in the age of 63.
Other pair - the well-known Siamese twins - sisters Blazhek - was born in 1878. Sisters became musicians - violinist and harp-player, one of them gave birth to the child.
In 1952 doctor Jacque Geller (USA) lead the first successful operation on division of Siamese twins. Now such operations are made even more often, and Siamese twins have more and more chances for a high-grade independent life.