Twins have been rare in human history and for that reason can seem special. Many cultures associate twins with health and vitality, while others see them as a philosophical reminder of the duality of ...

Jason Gilchrist does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

A groundbreaking study has traced the 66-million-year evolutionary history of primates and overturned conventional thought that our ancestors originally inhabited warm tropical forests. Using advanced ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Our recent research suggests that twins were actually the norm much further back in ...