The National Institute of Aerospace just posted a video of Apollo astronaut David Scott's lecture to the Lunar and Planetary Science Conference. Every year at LPSC, there is a "Masursky lecture," named in honor of Hal Masursky, one of the founders of modern planetary science, and one of the scientists who trained the Apollo astronauts to do field geology on the Moon. I'd never heard Scott speak before and found his lecture to be an absolute treat: funny, educational, engaging, full of joy at his adventure, though at the end, a little angry that we've not send more humans back. It's well worth 45 minutes of your time.
Apollo 15 Commander David Scott at the ALSEP station, EVA 2
Taken during the second Apollo 15 Extravehicular Activity, on August 1, 1971. Scott is working at the site of the Apollo Lunar Surface Experiments Package (ALSEP).