Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A fascinating world; excellent ideas

Vinge describes a world in which teleportation is an everyday reality --he and clears up all the little details of plausibility which other writers were too lazy or uninformed to bother with. Angular momentum, conservation of energy--these and other science aspects are beautifully worked out, behind a seeming fantasy scenario. A book to delight that small minority which still cares about science in science fiction.