More than three years ago, Albert Einstein announced (in the third edition of his book, The Meaning of Relativity) that he had developed an overall theory to account for both gravitation and small-scale phenomena, such as the quanta of energy that are studied in atomic physics (TIME, Jan. 2, 1950). Hardly any theoretical physicists came to his support, though a "unified theory" is what many of them are looking for most eagerly.
This week (in the fourth edition) Einstein sounded less sure of his achievement. He thinks that he has improved his equations, and he still believes that gravitation (i.e., relativity) is...
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