| C | H | A | P | T | E | R 28 |
| Special Relativity |

The Global Positioning System (GPS), which can locate objects on the earth with remarkable accuracy, uses the results of Einstein’s theory of special relativity. Jim King is guided home from a walk by both his seeing-eye dog, Spencer, and a special GPS device designed to help the blind. (©AP/Wide World Photos)

Copyright © 2007 John Wiley & Sons, Inc. All rights reserved.