Horizon examines supermassive black holes and the recent discovery that they are crucial to the formation of galaxies. Supermassive black holes were originally hypothesized to explain active galaxies and quasars, but later were discovered to be at the center of many ordinary galaxies including our own. (imdb)

A boy whose penis was burnt off when a circumcision goes wrong is turned into a girl as an attempt to prove a theory about gender identity. (imdb)