Peter Kapitsa had come to Columbia University to receive an honorary degree. It was his first visit to the US, and at 75, even after a heotic month of travel, his eyes were sparkling and his conversation lively. “Are you a physicist?” he asked. I said, “Yes.” “Good,” he said, “The journalists sometimes ask stupid questions.” He told me he does not work in low‐temperature physics any more; his latest paper, 135 pages long, was to be published in the December JETP. It is on controlled thermonuclear fusion.

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