"Worldwide, more than half a billion people live with mental or behavior disorders (WHO, 2017a). Although their rates and symptoms vary by culture, no known society is free of two terrible disorders - major depressive disorder and schizophrenia (Baumeister & Harter, 2007; Draguns, 1990a,b,1997). This unit examines these and other disorders" (Myers, 2018, p. 665).