Kuhn and colleagues report that “Previous research has suggested an association between living environment during the first 15 years of life and brain structure. More precisely, urbanicity during upbringing has been shown to be negatively related to prefrontal cortex grey matter. The present study focusses instead on the current living environment of 677 younger adults [about 22 years old] recruited from different cities across Europe. We observed a positive association between amount of tree cover density, in a radius of…