Toward a Unified Theory of Einstein's Life

In 1921, during a seemingly endless reception in his honor in Washington, Albert Einstein said to the diplomat next to him, "I've just developed a new theory of eternity." That quip came to mind after two new Einstein biographies, which together total more than 1,000 pages, thudded on my doorstep.

Walter Isaacson, a biographer and former executive at CNN and Time, and Jürgen Neffe, a German science journalist, resemble guests who show up, clutching Champagne bottles, for a party

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