english: We could look across time at the same people -- people, for example, who were genetically vulnerable to schizophrenia -- and ask what the contribution of mothering, of genetics are, and we could isolate third variables by doing experiments on the mental illnesses.
non_english: Možemo pogledati kroz vreme iste ljude -- ljude, na primer, koji su genetski podložni shizofreniji, i zapitati se koliki je doprinos sredine, a koliki genetike, a potom izolovati treću varijablu eksperimentalnim ispitivanjem mentalnih bolesti.