... if you have one, do you do anything about it?
Simple example: two children in café looking at menu. One - a glass-half-full person - says, Oh look at all this, there's bound to be something I like!! The other - a glass-half-empty person - says, I bet there won't be anything I want.
Is being a glass-half-empty person a fixed innate state, or can these natures be warmed up?
And, if so, how do (or would, if you don't have one of these) you do that?