 Larry Niven is one of the titans of late 20th century science fiction and Ringworld is his crowning jewel. It is about a group of interspecies mercenaries which includes two humans who are hired to explore a newly discovered ring-shaped world around a distant star. It has been built and long abandoned by some unknown race of super beings. The world however is not dead and it is not uninhabited. I've always felt that this book is a little bit overrated. It's not quite as good as its reputation. However it is an undeniable classic and you really owe yourself to read it if you want your science fiction experience to be considered well-rounded. The popular video game series Halo by the way owes its existence to this book. You can support 30 Seconds Sci-Fi and my other projects by becoming a patron. There is a link in the description below. And visit the 30 Seconds Sci-Fi Tumblr, that's my headquarters. In addition to my videos I publish links and updates there every day.