Asimov does his typically thorough job of annotating, filling this book with tons of information about obscure references and historical tidbits. However, I was a bit dismayed at Asimov's heavy-handed critique of Swift in the 3rd book. As many readers of Swift know, the 3rd book contains a very harsh criticism of science and technology. Asimov decides to use his annotations to defend science. While his aims are certainly admirable, I think that he takes Swift's comments out of context in an effort to prove his own case.That minor cavil aside, this is an excellent book for young people studying this great classic of literature, and for fans of both Swift and Asimov.