This is true. The general theory regarding personality development is that some aspects of our personality remain constant, while others will change due to environment. This entails a mixture of "nurture and nature" with regard to personality.
Simile- he's like a lion
metaphor - I'm going to blow my top
I'm not too sure about this (it's been ages since I last learned about Henrik), but I'm certain he was exiled to Italy in the 1860's, from where he moved to Germany in 1868-ish.
Hope I helped!! xx
I always thought it was how science could taken too far to the point of us playing god