The days following Labor Day are seeing the last folks heading back to school. I know some parts of the country have been back for about a month, but around here there are still a few districts starting up over the next couple of days. Let's head to a memorable puzzle I featured back in 2012 that contains a little course from Geocaching University in:
Flexagons 101
If you pass that one, you're qualified for the graduate level course:
Flexagons 301
Tomorrow we'll ...
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