Previously we’ve looked at some of the artefacts that accompanied the astronauts on their mission to the Moon, and now on the anniversary of their splashdown and safe return, we’re reminded how the crew beta-tested new technologies—and not just the obvious ones or Tang—but also the prototype for Sony’s Walkman, the rather revolutionary cassette player becoming commercially available a decade later. Though not quite the soundtrack from Guardians of the Galaxy (I wonder if the plot device was an homage), the best part of learning about this is that the playlist is available and includes Spinning Wheel, Everyday People and Angel of the Morning by Merrilee Rush and the Turnabouts, charting in the previous year.