title: Challenging Singer.
authors.forename: N
authors.initials: N
authors.lastname: Hentoff
mesh_terms: D001293:Attitude to Death; D005053:Eugenics; D028601:Euthanasia, Active / Q000941:ethics*; D006801:Humans; D018458:Persistent Vegetative State; D012297:Right to Die / Q000941:ethics*