In 1978 or so, in seventh grade at St. George, a Catholic elementary school in Baton Rouge, one of my favorite teachers was Mr. Owens. In 1989, when I was in grad school, I sent him the following letter (somewhat edited here). He was by then the principal of St. George and a friend who visited years later said he saw a copy of my letter pinned on the bulletin board being Mr. Owens’s desk. I took that to mean he was happy to have gotten the letter. He passed away a few years ago.
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Sunday, July 30, 1989
Mr. Jim Owens, Principal
St. George Elementary School
7880 Siegen Lane
Baton Rouge, LA 70809
Dear Mr. Owens,
I don’t know if you remember me or not. I used to be a student of yours at St. George, when I was in the 7th grade. I think that was in 1978 or so. You taught me religion.
You might not remember this either, but I haven’t forgotten. You always gave us puzzles and riddles to work out. For example, if you have 99 marbles of one color and 1 of the other color in a bag, what is the most you would have to pull out to be sure what the dominant color is. Or, in the famous Alpha (truth tellers) and Beta (liars) puzzle, what do you ask the native at the bridge to see if the bridge is safe. Etc. [The solution is: you ask the native: if you were a member of the other tribe, and I asked you if the bridge were safe to cross, what would you answer? And then the answer is the opposite of the answer.]
Well, one puzzle you gave us was: if you have three cities at the top, and three at the bottom, can you draw a road from each city at the top to each at the bottom without crossing roads? We tried and tried, all of us students, to get that one; no one could find a solution. We always had to cross some lines. When we told you we thought it was impossible, you said, “Ahh, but can you prove it’s impossible?” Which none of us could.
I am writing to present you with the proof. [continue reading…]

















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