Like Dr.Guth, Dr.Greene also achieved to bring down the theories of the Theoretical Physics down to earth to the level of understanding of man on the street. It is all about finding a fundemental particles in the creation. fundemental building block and fundemental formula that will spring out explain the creation as we know it. After a good and simple introduction you start to learn the difficulties and questions that resulted in String Theory, or Theory of everything or Grand Unification, whatever you call it. As you read the book if you are not the techinician of the field you start to imagine things and start to give shape to the things that are described. That is okey at least you became familiar with what is going on. He talks about Higgs fields, is it a type of a Corn field or may be a liitel more seriously, is it some kind of magnetic field. Anyway if you know what he is talking about you learn great from the book, otherwise you know your deficit and get direction.