It has a new name now, but multiple personality disorder took the world by storm after Sally Field played Sybil on the small screen in 1977. But how real is it? How does it actually work in the human mind? And should you be worried?

Sources:
Chicagomag.com, Dangerous Therapy: The Story of Patricia Burgus and Multiple Personality Disorder, By Cynthia Hanson, June 1, 1998
https://psychology.wikia.org/wiki/The_Three_Faces_of_Eve
https://people.com/archive/eve-had-not-three-but-22-faces-now-chris-sizemore-is-happily-just-herself-vol-8-no-11/
https://www.theravive.com/today/post/rip-chris-sizemore-a-look-at-dissociative-identity-disorder-0003067.aspx