He'll celebrate this birthday surrounded by family and friends at his home in Palo Cedro, California.

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Cedro is a local citrus fruit that looks like a giant lemon.

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Like a lemon with comparatively less of the juicy bit, the cedro is nine-tenths pith, but the pith is soft, slightly spongy and delicious.

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When he visited the Cedro dorm, on January 30th, the forty or so students gathered around him in the recreation room often asked the kinds of benign question posed to celebrities on TV shows: Did he miss computer science?

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