The whole of science and one is tempted to think the whole of the life of any thinking man is trying to come to terms with the relationship between yourself and the natural world. Why are you here and how do you fit in and what's it all about.
Since it's based on my parents it's more emotionally close to me than some of my more surreal plays. And then I like the balance of the comic and the sad. It should play as funny but you should care about the characters and feel sad for them.