Nobel Lecture: Spontaneous symmetry breaking in particle physics: A case of cross fertilization

We reproduce here the Nobel lecture of Yoichiro Nambu on the Spontaneous Symmetry Breaking In Particle Physics: A Case of Cross Fertilization. Reprinted with permission from the Nobel Foundation and Reviews Of Modern Physics, Volume 81, JulySeptember 2009. Ignazio Licata and Ammar Sakaji c © Electronic Journal of Theoretical Physics. All rights reserved.