I was waxing lyrical at the Plan9 conference to Richard who I have known for a few years about how amazing the turtle and Logo is/was for classrooms because it could engage with a wider range of children than trying to teach them programming because it stimulated those maybe interested in programming, art, robotics, languages and maths with teamwork and communication skills and even just watching things happening. Imagine my pleasure when he said "I'm glad you appreciate it" and went on to tell me the story of developing it when I had no idea!
I was updating with my personal breadcrumbs when you replied. Richard was a colleague of mine - the plan9 scene leads very quickly to luminaries - I have had the privilege of meeting some very talented programmers who are humble so one day you will be on a webpage and go "gosh, I know that guy"
I'd love to chat more if you'd be willing to drop me a line. My email address is in my profile. Too bad I'm too late for the plan9 scene. I'm fascinated to find this long-running nexus between OS hacking and teaching programming, because that's kinda what I've been up to lately and I've worried some that it bespeaks a lack of focus.