Puff the Magic Dragon and Pachelbel's Canon

Did you know what Puff the Magic Dragon (besides talking about marijuana) also is based on the same chord progression as Pachelbel's Canon? Neither did I. Up until I heard the story on NPR, I could not sing Pachelbel's Canon if you asked me too, even though I had heard it before (as you probably have too). It's neat how music is interconnected.