How do we find out how our brains work? You could introduce the idea of scientific research and psychology with this Catalyst article.
How do animals with small brains behave in a way that appears to be clever? A question that would fascinate most students. This article explains how scientists have discovered the mechanisms behind an individual ant's behaviour through a series of simple experiments and detailed observation.
It is a useful resource to illustrate the need for scientific method when studying behaviour, perhaps in preparation for a class investigation. It also demonstrates the possible applications of such research in answer to questions like 'why are we learning about this?