Double Vision: Eye Findings in Twins Reared Apart/Twin Research: Perinatology and Conjoined Twins; Thoracopagus Twin Cattle; MZ Twins Discordant for Musical Training/In the News: College Benefits for Twin Parents; Octomom Revisited; Genetic Editing of Infant Twins; Quarternary Marriages; Unusual Twin Pregnancy.

Findings related to visual functioning, drawn from early reared-apart twin studies, are summarized. These data are supplemented by more recent research from similar investigations. This section is followed by a survey of findings and conclusions from a special issue of the journal Seminars in Perinatology concerning the challenges and management of conjoined twins. An early case report on thoracopagus-conjoined twin cattle is also presented, as are neuroanatomical findings from a study of monozygotic twins discordant for musical training. Items noted in the news include college benefits for twin parents, an update on octomom, claims of gene editing of infant twins, the nature of quarternary marriages and an unusual planned twin pregnancy.