Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A remarkable meditation on time and reality

We seldom stop to consider how the laws of the universe affect our lives. Alan Lightman is one who has who has spent the time to do that. He describes several worlds in which time behaves in ways that are bizarre and unusual (at least, to us)- and how it changes the people in those worlds. One of these worlds is ours. Any one of them could have been ours if nature had chosen a little differently. How would we react if we knew that everything was going to end on a certain day at a certain time? How would society develop if time ran at different rates for different towns? This book manages to make the science of time seem immediate and personal.