This post is mostly a transcript with notes of a talk I did at G4GX, the 10th Gathering for Gardner. As such, it differs from the normal format a bit.
(Videography due to Peter Bickford- there was a cameraman recording all the talks there, but I haven’t heard from him recently.)
Transcript (sentences in brackets represent notes, i.e, things I wanted to say in the talk but didn’t have time for):