Twins who are conjoined do not necessarily want to be parted They both died at the age of 59. Chang suffered a stroke and Eng bled to death into his brother's body. Both are reported to have had very separate characters. Chang was said to be the more intelligent twin, but was bad-tempered and an alcoholic. Eng did not drink and was more easy-going.
Research shows that twins who are joined even at the brain can have totally separate personalities.
But sharing the same blood supply has some consequences. For example, if one twin gets drunk, the other feels the effects, if not to the same degree. Traits, such as blackheads, spots or skin cancer, can lie dormant in identical twins for years and then appear at more or less the same time in each person. They face regular scans. Because their arteries are connected and they share the same blood supply, one twin often manages to get more blood and nourishment than the other.