The exchange between the "Andrews" about longitude suddenly reminded me
of a book I read in the years BC (Before Caching). It has the rather
long title of Longitude: The True Story of a Lone Genius Who Solved the
Greatest Scientific Problem of His Time, and it's written by Dava Sobel.
The title pretty much sums it up. It might not sound like interesting
reading, but I couldn't put it down. and that's before I even knew what
a GPSr is. Could be a good one for you to take on your summer vacation.
Steve
Team Tierra Buena
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