Interesting. Heinlein was an early favourite and I still have all his books. It also led to my cementing my closest friendship ( after my husband that is). We met at work and seemed to get on well but when we discovered we both read Heinlein we were delighted because until then neither of us had come across anybody else who had heard of him. I also love Asimov's Robot stories and one or two short stories but apart from that I prefer his non fiction. It is no wonder he was regarded as such a good lecturer whilst at the University.