# Perhaps it is worth pointing out that 2004 is also the 40th anniversary of

Broken Symmetry and the Mass of Gauge Vector Mesons
F. Englert and R. Brout, Phys. Rev. Lett. 13, 321-323 (1964);

Broken Symmetries, Massless Particles, and Gauge Fields
P. W. Higgs, Phys. Lett. 12, 132-133 (1964);

Broken Symmetries and the Masses of Gauge Bosons
P. W. Higgs, Phys. Rev. Lett. 13, 508-509 (1964);

as well as

Global Conservation Laws and Massless Particles
G. S. Guralnik, C. R. Hagen, and T. W. B. Kibble, Phys. Rev. Lett. 13, 585-587 (1964);

and, no doubt, of other significant developments.

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