November 1970: "Enter the Meditator and surround yourself with the graphics which cover its walls . . . you may find the sensation akin to that mystical communion with nature that you experience when alone in a forest — or the sense of peace you feel in an empty cathedral."
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.