A new paper by Steven Weinberg (MIT) is causing great excitement among high‐energy physicists. One leading theorist calls it “the most important development in weak‐interaction theory in the last 15 years.” Weinberg explained to us that his new work is a possible solution of two outstanding problems. One is how, in a natural way, to unify the weak and electromagnetic interactions. The second is how to make a theory of weak and electromagnetic interactions in which the infinities can be dealt with in as simple a way as they are in quantum electrodynamics.

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