Knights Bachelor Create Talk0 Category page This page needs content. You can help by adding a sentence or a photo! Add to this page! “ Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual... Karl R. Popper Pages in category "Knights Bachelor" This category contains only the following page. P Karl R. Popper Retrieved from "http://psychology.wikia.com/wiki/Category:Knights_Bachelor"