Natural scientists 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... Pyotr Gannushkin Pages in category "Natural scientists" This category contains only the following page. G Pyotr Gannushkin Retrieved from "http://psychology.wikia.com/wiki/Category:Natural_scientists"