Aphasia has led to Bruce Willis's retirement from acting, while 'Game of Thrones' star Emilia Clarke said she feared it would ruin her life and career. Photo: Yui Mok, AP
Aphasia has led to Bruce Willis's retirement from acting, while 'Game of Thrones' star Emilia Clarke said she feared it would ruin her life and career. Photo: Yui Mok, AP

What is aphasia? Bruce Willis, Emilia Clarke and others who have suffered from symptoms