This set was completely improvised on the spot. I had no idea what topics I'd be given:
Colophon: This web site was lovingly hand-crafted with GNU Emacs. It runs on a Debian Linux system. The left photo is a selfie taken with my beloved Nokia N900 cellphone, and the right photo is a selfie taken with a Samsung W200 pocket camcorder. Both photos were edited in GIMP.