Contains one of the nicest explanations I?ve read of the fact objects of different mass fall at the same rate. His chapter on the tides, from the water in the River Severn to the squeezing and stretching of Jupiter?s moon Io, is lovely. We end with the current attempt to reconcile gravity and quantum theory, and a surprisingly accessible and enjoyable discussion of string theory and multidimensional space. Enjoyably, Chown?s book doesn?t give the sense that ?physics is broken? I?ve come across elsewhere; it?s more that we?re on the cusp of an exciting step change in our understanding.