Yes, wildly off-topic, but I'll indulge. Starship Troopers is one of my favorites, along with Glory Road, one of the most fun books I've ever read 20 times. But there are more important works, like The Moon Is A Harsh Mistress that other people who I'm sure will be posting after this could suggest. RAH was one of the most important writers of the 20th century, irrespective of genre, and it is one of my greatest disappointments that I never got to meet him.