Science News publishes a weekly column devoted to 'cool stuff' from the world of mathematics. There have been over 250 articles under the title 'Ivars Peterson's Math Treks'. New developments and their applications, old puzzles revisited, famous problems and historic events have all featured. This column has been extremely popular for its brief, informal forays into some of the more unusual aspects of mathematics. Ivars Peterson has enhanced and updated a selection of articles for this book and further bibliographic details and web links are available online. The contents span a wide range of topics and there will be something here for anyone with an interest in mathematics.