Among the current executives to whom Mr. Buffett has referred in emotional terms at least eight times, the one who scored the highest is Danny Goldman, chief financial officer of Iscar, Berkshire's Israeli-based cutting-tool division ("incredible, " wrote Mr. Buffett in his 2009 letter, for example).

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In early experiments, the researchers have used boiled eggs, with the Smart-Tool cutting through the egg white, but stopping when it reached the yolk.

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