Life isn't so complicated for children. They have more time to think about the really important things. That's why I occasionally moralise in my children's books in a way I wouldn't dare when writing for adults.
I have a specialized racing bike, which is great because it has a solid build, is comfortable to ride, and is lightweight.
I don't practice, but I am still officially in paediatrics. I keep in touch with journals, and I have a very good data bank of medical information and there is a key thing for a writer knowing where to go. I know where to go to get the information that I need.