In the 21st century, wars between nations have been replaced by intra-state conflicts or hostilities involving groups of various types across national borders, reflecting advances in transportation and communications.Waseda University Peace Seminar invited speakers active in working for peace in a range of fields to use their personal experiences to discuss how to dismantle the “dividing walls" between people that still lead to conflict today. Themes addressed in the lectures collected here include the roles of volunteer activities, the Constitution of Japan, human security, the mass media, and peace of mind in the individual.A fascinating book that analyzes the impact of the Internet on world peace and also discusses the united efforts of mayors from over 5,000 cities around the world to abolish nuclear weapons. -- Akiba Tadatoshi, former Mayor of Hiroshima and former President of Mayors for Peace