vii Preface ours and ours only,Thak are de to Chrlote Gree of OUP er crisp approa to edn al help,and to Sor the senior phyaicsedtor,iorhisadnirablepetiercediringthisbokslongperiod of gestation. Our hearty gratitude goes toour friends and colleagues who helped us C at various moments and in various-small and big-ways.A short list includes:A.Bonaccorso,D.M.Brink,P.Calabrese,P.Cecchi,R.Col- lina,E.D'Emilio,A.Di Giacomo,G.Dunne,T.Elze,M.Fukugita,C. Giannessi,V.Gracco,R.Guida,R.Jackiw,F.Maccarrone,G.March- esini,M.Matone,P.Menotti,M.Mintchev,F.M.Miranda,G.Morchio, E.Onofri,L.Picasso,M.Rocca,S.Shore,A.Toncelli,M.Tonelli,A. 1月 Tonomura,P.Truini,A.Vainshtein,and G.Veneziano. A final message to all of you(especially to the young) Read and Enjoy! Pisa,February 2009 K.Konishi and G.Paffuti