A reference book for an update on the understanding of the universe ... Until next scientific revolution. After all, this is only a theory for now not validated by the experiment (that come from?). A very good initial synthesis of classical theories before more strenuous explanations of the worlds 10 or 11 dimensions and spaces of Calabi-Yau, very accessible to non-scientists. However, the author manages to convey her passion we partially (stubbornness?) For this area of research and that's good for science!
