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Not quite related to this thread. but peripherally, I am reading a book, Life Finds a Way which mentions The Traveling Salesman Problem - how to find the best route for a traveling salesman to visit all his clients. Then he mentioned tourist destinations. What is the most efficient route to visit all of the 666 most visited tourist destinations? This question was answered in 1987. The author used this as an example of a "hard" problem. I suppose if you limited the discussion to only tourist destinations reachable by cruise boats, it would still be an interesting question. Possibly even a hard question. What is the most efficient route to visit all your favorite cruise stops? There are several constraints that are different than "all of the 666 favorite tourist destinations?"

The book is about evolution, and he explains some of the issues that have to be understood to understand how evolution can evolve a single cell organism into a human. (My Southern Baptist fundamentalist BIL calls it eviloution.)

Life Finds a Way by Andreas Wagner. copyright 2019
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