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Complementing "Surely you're Joking",
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This review is from: Don't You Have Time to Think? (Paperback)
This book is not as amusing as the "Surely you're joking" books. The book is a collection of letters and provides a good complement to the other books as they tell Mr. Feynman's thoughts in the moment and not in retrospect.
One amusing coincidence is that Mr. Feynman wrote from Greece about an ancient machine that nobody knew what was. It is known as the Antikythera Mechanism, and the mystery was solved the same week as I read that letter. It is an astronomical clock.