I re-discovered the PS101 series a couple weeks ago. Turns out back in 2012 I had made it to Lesson 5, got stuck, then forgot about it. But after recently completing the Geodyssey, my travels led me back here and the time seemed right to try and finally pass the final exam.
Unfortunately, those four years' time did not really clear up my thinking because I still remained stuck on Lesson 5 after mulling it over the holiday break. I suspected I might be over-thinking things, so sent my thoughts to the CO. He confirmed half of my thought process was correct and that I should probably do a little more digging. Soon enough, I had too-good-to-be-true information which quickly led to the solution. Lesson 6 was a nice exercise in patience. It sat open on my desktop for a couple days until I finally made the connection. Loved the description and the Happy Fun Ball-like disclaimers. What a nice series! And I'm excited that moving forward I am all signed up to receive any future puzzlehead news.
I will be in South Florida next month and plan to find some ePeterso2 caches. Don't think I'll have enough time to physically visit the PS101 final, but who knows... Thanks again for the fun puzzles!